Photonic Sciences Laboratory

Physical Research Laboratory, Navrangpura, Ahmedabad-380009, INDIA
         Photo of Goutam K. Samanta Dr. Goutam K. Samanta
Professor



 Tel: +91 (79) 2631 4635 (O)
+91 (79) 2631 4703 (L)
Fax: +91 (79) 2631 4460
e-mail: gsamanta@prl.res.in, gsamanta@gmail.com

Research Interests

  • High brightness entangled photon sources, spatial structured single photon sources
  • Quantum sensing, imaging, and quantum communication
  • Nonlinear optics: Second- and third- order nonlinear optical effects
  • Nonlinear interaction of structured beams
  • Structured beam optical parametric oscillators
  • Generation, detection and application of THz radiation

    • Recognition

  • Adjunct Professor, IIT Madras
  • Editorial Board Member, Journal of Optics, IOP, 2021-
  • Guest Editor, Spotlight on India: Recent Advancements in Light-Matter Interaction
  • Guest Editor, Special Issue on Advances in Optics in India
  • Member, Advisory panel of Journal of Optics till March 2021

    • Group Members

    Current members

  • Mr. Anirban Ghosh (Scientific Assistant)
  • Mr. Vimlesh Kumar (Mechanical Engineer)
  • Ms. Chahat Kaushik (Senior Research Fellow)
  • Mr. Rutuj Gharate (Electronics Engineer)
  • Ms. Swagata Sarkar (DST Inspire PhD student)
  • Mr. Ayan Kumar Nai (Chanakya Junior Research Fellow)
  • Mr. Milan Jana (DST-TDP Project Associate-I)
  • Mr. Sanjan Roychowdhury (DST-TDP Project Associate-I)
  • Dr. Bhabhes Pant (Postdoctoral Fellow)

    • Former members and their affiliation while leaving the group

  • Dr. Sandeep Singh (Postdoctoral Fellow)(PDF, DTU Denmark)
  • Dr. Saumya Joyti Sarkar Chiba University, Japan
  • Dr. Subith Kumar University of the Witwatersrand, South Africa
  • Dr. Deepika Yadav (PDF, Japan)
  • Mr. Anupam Pal (Master student, Abbe School of Photonics, Germany)
  • Dr. Varun Sharma (Postdoctoral Fellow, University of Graz, Austria)
  • Dr. Ravi Kiran Saripalli (Postdoctoral Fellow, University of New Orleans, USA)
  • Mr. Harshith Bachimanchi (PhD student, University of Gothenburg, Sweden)
  • Dr. A S V Rao (PDF, JSPS Fellow, Chiba University, Japan)
  • Dr. Raghwinder Singh (PDF, Delaware University, USA)
  • Dr. Jabir M. V. (PDF, NIST Gaithersburg, USA)
  • Mr. Sabir Alam (PhD student, Hong Kong University, Hong Kong)
  • Dr. Aadhi A. (PDF, INRS Varennes, Canada)
  • Dr. Apurv Chaitanya N. (PDF, Tecnologico de Monterrey, Maxico)

    • Limited no. of postdoc positions are available in our group

    PhD Thesis from the Group

  • Dr. Saumya Jyoti Sarkar Study of Linear and Nonlinear Talbot Effects for Sensing Applications (19th May 2025)
  • Dr. Subith Kumar Generation, characterization, and application of vector vortex beams (17th October 2024)
  • Dr. Sandeep Singh Generation and Characterization of Pair Photons for Quantum Sensing Applications (04th March 2024)
  • Dr. Varun Sharma Structured beam optical parametric oscillators (18th February 2020)
  • Dr. Jabir M. V. Generation and characterization of quantum entanglement using SPDC photons (9th October 2018)
  • Dr. Apurv Chaitanya N. Nonlinear interaction of structured optical beams (22nd July 2016)
  • Dr. Aadhi A. Generation and characterization of coherent beams of tunable spectral and spatial properties using optical parametric oscillators (2nd February 2016)

    • Journal Publications

    Full list of publications and citation matrix can be found here

      2025

    1. A perspective on 25 years of advances as reported in the Journal of Optics (Editorial)
      Andrew Forbes, Mohamed Swilliam, Kayn A Forbes, Yijie Shen, Chao He, Shuyuan Xiao, Jorg B Gotte, G. K. Samanta, et. al.
      Journal of Optics 27 060202 (2025).

    2. Classical-to-quantum transfer of geometric phase for non-interferometric phase measurement and manipulation of quantum state
      Vimlesh Kumar, Chahat Kaushik, M. Ebrahim-Zadeh, C. M. Chandrashekar, and G. K. Samanta
      arXiv:2505.20108 (2025).

    3. Multi-GHz repetition rate, tunable ultrafast mid-infrared source
      Anirban Ghosh, Niladri Das, S. Chaitanya Kumar, Kavita Devi, and G. K. Samanta
      Optica Open (2025).

    4. Beamsplitter-free, high bit-rate, quantum random number generator based on temporal and spatial correlations of heralded single-photons
      Ayan Kumar Nai, Amritash Sharma, Vimlesh Kumar, Sandeep Singh, Shreya Mishra, C. M. Chandrashekar, and G. K. Samanta
      AVS Quantum Science 7, 011401 (2025).

    5. Dead-zone-free single-beam atomic magnetometer based on free-induction-decay of Rb atoms
      Shrey Mehta, G. K. Samanta, and Raghwinder Singh Grewal
      Applied Physics Letters 126, 044002 (2025).

      6. 2024

    6. Device-independent, high bit-rate quantum random number generator with beam-splitter-free architecture and live Bell test certification
      Ayan Kumar Nai, Vimlesh Kumar, and G. K. Samanta
      arXiv:2412.18285 (2024).

    7. Non-interferometric measurement of geometric phase through stimulated second harmonic generation
      Chahat Kaushik, Anirban Ghosh, S. Chaitanya Kumar, K. Devi, R. Das, and G. K. Samanta
      Optica Open (2024).

    8. Talbot effect-based sensor measuring grating period change in subwavelength range
      Saumya J Sarkar, M Ebrahim-Zadeh, and G. K. Samanta
      Scientific Reports 14, 30872 (2024).

    9. Fast measurement of group index variation with optimum precision using Hong-Ou-Mandel interferometry
      Sandeep Singh, Vimlesh Kumar, and G. K. Samanta
      APL Quantum 1, 046117 (2024).

    10. Evolution of C-point singularities and polarization coverage of Poincare-Bessel beam in self-healing process
      Subith Kumar, Anupam Pal, Arash Shiri, G. K. Samanta, and Greg Gbur
      Scientific Reports 14, 16647 (2024).

    11. Harnessing nonlinear frequency upconversion of Talbot effect with flexible Talbot lengths
      Harshith Bachimanchi, Saumya J. Sarkar, M. Ebrahim-Zadeh, and G. K. Samanta
      Optics Express 32, 15967-15977 (2024).

      12. 2023

    12. Dynamically tunable broadband output coupling of optical oscillators based on non-cyclic geometric phase mirror (Editor's Pick)
      Chahat Kaushik, A. Aadhi, Anirban Ghosh, R. P. Singh, S. Dutta Gupta, M. Ebrahim-Zadeh, and G. K. Samanta
      APL Photonics 8, 116110 (2023).

    13. Near-video frame rate quantum sensing using Hong-Ou-Mandel interferometry
      Sandeep Singh, Vimlesh Kumar, Varun Sharma, Daniele Faccio, and G. K. Samanta
      Advanced Quantum Technologies 6, 202300177 (2023).

    14. Simple experimental realization of optical Hilbert Hotel using scalar and vector fractional vortex beams (Cover page, Featured)
      Subith Kumar, Anirban Ghosh, Chahat Kaushik, Arash Shiri, Greg Gbur, Sudhir Sharma, and G. K. Samanta
      APL Photonics 8, 066105 (2023).
      15. Cover page of APL Photonics, Vol 8, Issue 6, 2023
      Featured by Scilight

    15. Controlling the coverage of full Poincare beams through second-harmonic generation
      Subith Kumar, Ravi K. Saripalli, Anirban Ghosh, Wagner T. Buono, Andrew Forbes, and G.K. Samanta
      Physical Review Applied 19, 034082 (2023).

    16. A tolerance-enhanced spontaneous parametric downconversion source of bright entangled photons
      Sandeep Singh, Vimlesh Kumar, Anirban Ghosh, Andrew Forbes, and G. K. Samanta
      Advanced Quantum Technologies 6, 2200121 (2023).

      17. Till 2022

    17. Imaging inspired characterization of single photons carrying orbital angular momentum
      Vimlesh Kumar, Varun Sharma, Sandeep Singh, S. Chaitanya Kumar, Andrew Forbes, M. Ebrahim-Zadeh, and G. K. Samanta
      AVS Quantum Sci. 4, 015001 (2022).

    18. Tunable, high-power, high-order optical vortex beam generation in the mid-infrared
      Varun Sharma, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Express 30, 1195-1204 (2022).

    19. Tunable vortex beam generation using an optical parametric oscillator with an antiresonant-ring interferometer
      Varun Sharma, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 46, 3235-3238 (2021).

    20. Nonlinear frequency conversion of 3D optical bottle beams generated using a single axicon
      A. Srinivasa Rao, Deepika Yadav, and G. K. Samanta
      Optics Letters 46, 657-660 (2021).

    21. Watt-level, ultrafast, tunable yellow source based on single-pass, fourth-harmonic generation of Cr2+:ZnS laser at 2360 nm (Editor's Pick)
      Deepika Yadav, Anirban Ghosh, Ravi K. Saripalli, and G. K. Samanta
      Optics Letters 45, 5109-5112 (2020).
      News Release by OSA
      News Release by OPN

    22. Multi-structured-beam optical parametric oscillator
      Varun Sharma, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Express 28, 21650-21658 (2020).

    23. Tunable ultraviolet vortex source based on a continuous-wave optical parametric oscillator
      Varun Sharma, G. K. Samanta, S. Chaitanya Kumar, R. P. Singh, and M. Ebrahim-Zadeh
      Optics Letters 44, 4694-4697 (2019).

    24. Frequency-conversion of vector vortex beams with space-variant polarization in single-pass geometry
      Ravi K. Saripalli, Anirban Ghosh, N. Apurv Chaitanya, and G. K. Samanta
      Applied Physics Letters 115, 051101 (2019).

    25. Controlled generation of array beams of higher order orbital angular momentum and study of their frequency-doubling characteristics
      B. S. Harshith, and G. K. Samanta
      Scientific Reports 9, 10916 (2019).

    26. Single-pass, second-harmonic generation of high-power, ultrafast mid-IR Cr2+:ZnS laser at 2360 nm
      Anirban Ghosh, Deepika Yadav, and G. K. Samanta
      Optics Letters 44, 3522-3525 (2019).

    27. Tunable vector-vortex beam optical parametric oscillator
      Varun Sharma, S. Chaitanya Kumar, A. Aadhi, H. Ye, G. K. Samanta, and M. Ebrahim-Zadeh
      Scientific Reports 9, 9578 (2019).

    28. Controlled generation of vortex and vortex dipole from a Gaussian pumped optical parametric oscillator
      Varun Sharma, A. Aadhi, and G. K. Samanta
      Optics Express 27, 18123-18130 (2019).

    29. Controlling the bi-photon orbital angular momentum eigenmodes using asymmetric pump vortex beam
      M. V. Jabir, Ali Anwar, and G. K. Samanta
      Journal of Optics 21, 055201 (2019).

    30. High-power, high repetition-rate, ultrafast fibre laser based source of DUV radiation at 266 nm
      A. Srinivasa Rao, N. Apurv Chaitanya, and G. K. Samanta
      OSA Continuum 2, 99-106 (2019).

    31. Simultaneous generation of high-power, ultrafast 1D and 2D Airy beams and their frequency-doubling characteristics
      Raghwinder S. Grewal, Anirban Ghosh, and G. K. Samanta
      Optics Letters 43, 3957-3960 (2018).

    32. Orbital angular momentum exchange in a picosecond optical parametric oscillator
      Varun Sharma, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 43, 3606-3609 (2018).

    33. On-axis intensity modulation-free, segmented, zero-order Bessel beams with tunable ranges
      A. Srinivasa Rao, and G. K. Samanta
      Optics Letters 43, 3029-3032 (2018).

    34. High-power, continuous-wave, tunable mid-IR, higher-order vortex beam optical parametric oscillator
      A. Aadhi, Varun Sharma, and G. K. Samanta
      Optics Letters 43, 2312-2315 (2018).

    35. Nonlinear frequency doubling characteristics of asymmetric vortices of tunable, broad orbital angular momentum spectrum
      Sabir Ul Alam, A. Srinivasa Rao, Anirban Ghosh, Pravin Vaity, and G. K. Samanta
      Applied Physics Letters 112, 171102 (2018).

    36. High-power, high repetition rate, tunable, ultrafast vortex beam in the near-infrared
      A. Aadhi, and G. K. Samanta
      Journal of Optics 20, 01LT01 (2018).

    37. Robust, high brightness, degenerate entangled photon source at room temperature
      M. V. Jabir, and G. K. Samanta
      Scientific Reports 7, 12613 (2017).

    38. Continuous-wave, singly resonant parametric oscillator-based mid-infrared optical vortex source
      A. Aadhi, Varun Sharma, R. P. Singh, and G. K. Samanta
      Optics Letters 42, 3674-3677 (2017).

    39. Direct transfer of classical non-separable states into hybrid entangled two photon states
      M. V. Jabir, N. Apurv Chaitanya, Manoj Mathew, and G. K. Samanta
      Scientific Reports 7, 7331 (2017).

    40. High power, high repetition rate, tunable broadband mid-IR source based on single-pass optical parametric generation of a femtosecond laser
      A. Aadhi, and G. K. Samanta
      Optics Letters 42, 2886-2889 (2017).

    41. High power, higher order ultrafast hollow Gaussian beams
      N. Apurv Chaitanya, Amrit Chaitanya, J. Banerjii, and G. K. Samanta
      Applied Physics Letters 110, 211103 (2017).

    42. Controlled switching of orbital angular momentum in an optical parametric oscillator
      A. Aadhi, G. K. Samanta, S. Chaitanya Kumar, and M. Ebrahim-Zadeh
      Optica 4, 349-355 (2017).

    43. Multi-gigahertz, femtosecond Airy beam optical parametric oscillator pumped at 78 MHz
      A. Aadhi, Varun Sharma, N. Apurv Chaitanya, and G. K. Samanta
      Scientific Reports 7, 43913 (2017).

    44. Self-healing highly-chirped fiber laser at 1.0 um
      Xiaoming Wei, Cihang Kong, G. K. Samanta, Kevin K. Tsia, and Kenneth. K. Y. Wong
      Optics Express 24, 27577-27586 (2016).

    45. Frequency-doubling of femtosecond pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters
      N. Apurv Chaitanya, A. Aadhi, S. Chaitanya Kumar, M.V. Jabir, G. K. Samanta, and Majid Ebrahim-Zadeh
      IEEE Photonics Journal 8, 1-13 (2016).

    46. Hollow Gaussian beam generation through nonlinear interaction of photons with orbital angular momentum
      N. Apurv Chaitanya, M. V. Jabir, J. Banerjii, and G. K. Samanta
      Scientific Reports 6, 32464 (2016).

    47. Ultrafast Airy beam optical parametric oscillator
      N. Apurv Chaitanya, S. Chaitanya Kumar, A. Aadhi, G. K. Samanta, and M. Ebrahim-Zadeh
      Scientific Reports 6, 30701 (2016).

    48. Ultrafast optical vortex beam generation in the ultraviolet
      N. Apurv Chaitanya, S. Chaitanya Kumar, K. Devi, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 41, 2715-2718 (2016).

    49. Airy beam optical parametric oscillator
      A. Aadhi, N. Apurv Chaitanya, M. V. Jabir, Pravin Vaity, R. P. Singh, and G. K. Samanta
      Scientific Reports 6, 25245 (2016).

    50. Efficient nonlinear generation of high power, higher order, ultrafast perfect vortices in green
      N. Apurv Chaitanya, M. V. Jabir, and G. K. Samanta
      Optics Letters 41, 1348-1351 (2016).

    51. Generation of perfect vortex of variable size and its effect in angular spectrum of the down-converted photons
      M. V. Jabir, N. Apurv Chaitanya, A. Aadhi, and G. K. Samanta
      Scientific Reports 6, 21877 (2016).

    52. High-power, high-repetition-rate, Yb-fiber laser based femtosecond source at 355 nm
      N. Apurv Chaitanya, A. Aadhi, M. V. Jabir, and G. K. Samanta
      Optics Letters 40, 4269-4272 (2015).

    53. Frequency-doubling characteristics of high- power, ultrafast phase singular optical beams
      N. Apurv Chaitanya, A. Aadhi, M. V. Jabir, and G. K. Samanta
      Optics Letters 40, 2614-2617 (2015).

    54. All-periodically poled, high-power, continuous-wave, single-frequency tunable UV source
      A. Aadhi, N. Apurv Chaitanya, M. V. Jabir, R. P. Singh, and G. K. Samanta
      Optics Letters 40, 33-36 (2015).

    55. Violation of Bell's inequality for phase-singular beams
      S. Prabhakar, S. G. Reddy, A. Aadhi, C. Perumangatt, G. K. Samanta, and R. P. Singh
      Physical Review A 92, 023822 (2015).

    56. Three-particle hyper-entanglement: teleportation and quantum key distribution
      C. Perumangatt, A. Aadhi, S. G. Reddy, S. Prabhakar, G. K. Samanta, G. Paul, and R. P. Singh
      Quantum Information Processing 14, 3813-3826 (2015).

    57. Type-I frequency-doubling characteristics of high-power, ultrafast fiber laser in thick BIBO crystal
      Apurv Chaitanya N, A. Aadhi, R. P. Singh, and G. K. Samanta
      Optics Letters 39, 5419-5422 (2014).

    58. High-power, continuous-wave, solid-state, single-frequency, tunable source for the ultraviolet
      A. Aadhi, N. Apurv Chaitanya, R. P. Singh, and G. K. Samanta
      Optics Letters 39, 3410-3413 (2014).

    59. Yb-fiber-laser-pumped, high-repetition-rate picosecond optical parametric oscillator tunable in the ultraviolet
      G. K. Samanta, S.Chaitanya Kumar, A. Aadhi, and M. Ebrahim-Zadeh
      Optics Express 22, 11476-11487 (2014).

    60. Spatial distribution of spontaneous parametric down-converted photons for higher order optical vortices
      S. Prabhakar, S. G. Reddy, A. Aadhi, Ashok Kumar, P. Chithrabhanu, G. K. Samanta, and R. P. Singh
      Optics Communication 326, 64-69 (2014).

    61. Breakthroughs in Photonics 2012: Breakthroughs in Optical Parametric Oscillators
      M. Ebrahim-Zadeh, S. Chaitanya Kumar, A. Esteban-Martin, and G. K.Samanta
      IEEE Photonics Journal 5, 0700105 (2013).

    62. Continuous-wave, two-crystal, singly-resonant optical parametric oscillator: Theory and experiment
      G. K. Samanta, A. Aadhi, and M. Ebrahim-Zadeh
      Optics Express 21, 9520-9540 (2013).

    63. Frequency-modulation-mode-locked optical parametric oscillator
      A. Esteban-Martin, G. K. Samanta, S.Chaitanya Kumar, Kavita Devi, and M. Ebrahim-Zadeh
      Optics Letters 37, 115-117 (2012).

    64. Single-frequency, high-power, continuous-wave fiber-laser-pumped Ti:sapphire laser
      S. Chaitanya Kumar, G. K. Samanta, K. Devi, S. Sanguinetti, and M. Ebrahim-Zadeh
      Applied Optics 51, 15-20 (2012).

    65. High-power, continuous-wave Ti:sapphire laser pumped by fiber-laser green source at 532 nm
      G. K. Samanta, S.Chaitanya Kumar, Kavita Devi, and M. Ebrahim-Zadeh
      Optics and Lasers in Engineering 50, 215-219 (2012).

    66. Dual-wavelength, two-crystal, continuous-wave optical parametric oscillator
      G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 36, 3033-3035 (2011).

    67. High-efficiency, multicrystal, single-pass, continuous-wave second harmonic generation
      S. Chaitanya Kumar, G. K. Samanta, Kavita Devi, and M. Ebrahim-Zadeh
      Optics Express 19, 11152-11169 (2011).

    68. Fiber-laser-based green-pumped continuous-wave singly-resonant optical parametric oscillator
      S. Chaitanya Kumar, Kavita Devi, G. K. Samanta, and M. Ebrahim-Zadeh
      Laser Physics 21, 782-789 (2011).

    69. Multicrystal, continuous-wave, single-pass second-harmonic generation with 56% efficiency
      G. K. Samanta, S. Chaitanya Kumar, Kavita Devi, and M. Ebrahim-Zadeh
      Optics Letters 35, 3513-3515 (2010).

    70. Optimally-output-coupled, 17.5 W, fiber-laser-pumped continuous-wave optical parametric oscillator
      S. Chaitanya Kumar, R. Das, G. K. Samanta, and M. Ebrahim-Zadeh
      Applied Physics B 102, 31-35 (2010).

    71. High-power, continuous-wave, optical parametric oscillator pumped by an optically pumped semiconductor laser at 532 nm
      G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 35, 1986-1988 (2010).

    72. Continuous-wave optical parametric oscillator pumped by a fiber laser green source at 532 nm
      G. K. Samanta, S. Chaitanya Kumar, R. Das, and M. Ebrahim-Zadeh
      Optics Letters 34, 2255-2257 (2009).

    73. Broadband, high-power, continuous-wave, mid-infrared source using extended phase-matching bandwidth in MgO:PPLN
      R. Das, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 34, 3836-3838 (2009).

    74. Stable, 9.6 W, continuous-wave, single-frequency, fiber-based green source at 532 nm
      G. K. Samanta, S. Chaitanya Kumar, and M. Ebrahim-Zadeh
      Optics Letters 34, 1561-1563 (2009).

    75. High-power, single-frequency, continuous-wave second-harmonic-generation of ytterbium fiber laser in PPKTP and MgO:sPPLT
      S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Express 17, 13711-13726 (2009).

    76. High-power, continuous-wave, second-harmonic generation at 532?nm in periodically poled KTiOPO4
      G. K. Samanta, S. Chaitanya Kumar, M. Mathew, C. Canalias, V. Pasiskevicius, F. Laurell, and M. Ebrahim-Zadeh
      Optics Letters 33, 2955-2957 (2008).

    77. Continuous-wave, single-frequency, solid-state blue source for the 425-489 nm spectral range
      G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Letters 33, 1228-1230 (2008).

    78. Continuous-wave singly-resonant optical parametric oscillator with resonant wave coupling
      G. K. Samanta, and M. Ebrahim-Zadeh
      Optics Express 16, 6883-6888 (2008).

    79. 1.59 W, single-frequency, continuous-wave optical parametric oscillator based on MgO:sPPLT
      G. K. Samanta, G. R. Fayaz, and M. Ebrahim-Zadeh
      Optics Letters 32, 2623-2625 (2007).

    80. High-power, continuous-wave, singly resonant optical parametric oscillator based on MgO:sPPLT
      G. K. Samanta, G. R. Fayaz, Z. Sun, and M. Ebrahim-Zadeh
      Optics Letters 32, 400-402 (2007).

    81. Growth of urea doped benzophenone single crystal for nonlinear optical applications
      M. Arivanandhan, C. Sanjeeviraja, K. Sankaranarayanan, S. K. Das, G. K. Samanta, and P. K. Datta
      Optical Materials 28, 324-330 (2006).

    82. Realization of inverse saturable absorption by intracavity third-harmonic generation for efficient nonlinear mirror mode-locking
      P. K. Datta, S. Mukhopadhyay, G. K. Samanta, S. K. Das, and A. Agnesi
      Applied Physics Letters 86, 151105 (2005).

    83. Diode array pumped, non-linear mirror Q-switched and mode-locked Nd:YVO4 laser - a good tool for powder SHG measurement
      P. K. Datta, C. Basu, S. Mukhopadhyay, S. K. Das, G. K. Samanta, and A. Agnesi
      Pramana 63, 1003-1010 (2004).


     Researh Highlights

    Invited talks

    1. Quantum sensing using Hong-Ou-Mandel interferometry of single photon
      2. Photonics for Energy, sensing and Education (PESE-2025), IIT Gandhinagar, 16-17 January 2025.
    2. Quantum sensing using Hong-Ou-Mandel interferometry
      3. International Conference on Emerging Trends in Optical Technologies (ETOT-I), SRM University, Andhra Pradesh, 02-04 January 2025.
    3. Development of quantum sources and their applications
      4. Photonics 2024, IIT Kharagpur, 12-15 December 2024.
    4. Spatial structured heralded single photons
      5. XLVII OSI Symposium on Advances in Optics and Photonics Instrumentation (OPTOIn-2024), CSIR-CSIO Chandigarh, 23-25 October 2024.
    5. Quantum imaging of biological sample using Hong-Ou-Mandel interferometry
      6. BRICS WORKSHOP ON BIOPHOTONICS - 2024, Department of Atomic and Molecular Physics, MAHE, Manipal, India, October 03 - 05, 2024.
    6. Classical and quantum optics experiments using spatial structured beams
      7. Tutorial lecture, Summer School on Optics and Photonics (SOP 24), IISc Bangalore, 08-12 July 2024.
    7. Quantum sensing using Hong-Ou-Mandel interferometer
      8. Workshop 4: Space Quantum Technologies (INSQT), Physical Research Laboratory, Ahmedabad, 20 - 22 January 2024.
    8. Full Poincare beam: generation, characterization, and applications to represent Hilbert Hotel paradox
      9. Complex Light and Optical Forces XVIII, SPIE Photonics West, San Francisco, USA, 27 January - 1 February 2024.
    9. Structured beams for the experimental realization of Hilbert Hotel paradox
      10. International Conference on Optics, Photonics and Quantum Information (OPTIQ-2023), Cochin University of Science and Technology, Kochin, India 11-13 December, 2023
    10. Quantum sensing using high brightness heralded single photon source
      11. Quantum Information Processing and Applications (QIPA-2023), Harish-Chandra Research Institute (HRI), India, 04-10 December 2023.
    11. Full Poincare beams: realization of Hilbert Hotel paradox
      12. Physics seminar, IIT Delhi, 6 November 2023.
    12. Spatial structured optical beams: Linear and nonlinear optical studies
      13. ICFO-TIFRH International School on the Frontiers of Light, TIFR-Hyderabad, 25 -27, October 2023.
    13. Robust, bright photon sources for quantum communication and quantum sensing applications
      14. Physics Colloquium, IIT Madras, 13 September 2023.
    14. Hong-Ou-Mandel interferometry based quantum sensor
      15. Photonics, IISc Bangalore, 5 -8 July 2023.
    15. Structured optical beams for experimental implementation of Hilbert's Hotel paradox
      16. The "International Day of Light" celebration, IIT Ropar, 16th May 2023.
    16. Quantum sensing using Hong-Ou-Mandel Interferometer
      17. Summer School on Quantum Information and Quantum Technology - 2023 (QIQT-2023), IISER Kolkata, 8th May - 15th June 2023.
    17. Hilbert hotel paradox using structured beams
      18. Photonics for Health, Atmosphere, Security, and Education (PHASE 2023), IIT Gandhinagar, 30-31 March 2023.
    18. Nonlinear interaction and the generation of structured beams
      19. Structured Light and Spin-Orbit Photonics, ICTS, Bangalore, 29 Nov. 2022 to 02 Dec. 2022.
    19. Bright quantum source for quantum sensing
      20. Conference on Optics, Photonics, and Quantum optics (COPaQ-2022), IIT Roorkee, India, 10th - 13th November 2022.
    20. Entangled photon source for satellite-based quantum communication
      21. Summer School on Quantum Information and Quantum Technology - 2022 (QIQT-2022), IISER Kolkata, 1-4 June 2022.
    21. Are we ready with the indigenous entangled photon source for Indian space-based quantum technologies?
      22. Space Quantum Frontiers, Space Applications Centre, Ahmedabad, 19 May 2022.
    22. Quantum key distribution: Principle to practice
      23. Ahmedabad University, March 23, 2022.
    23. Satellite Based Quantum Science & Experiments
      24. DTDI Technology Conclave, 22-26 November, 2021, Indian Space Research Organization (ISRO), Bangalore.
    24. Development of entangled photon sources for future space-based experiments
      25. 44th Annual Symposium of the Optical Society of India, Frontiers in Optics and Photonics (FOP21), 24-27 September, 2021, Indian Institute of Technology, Delhi.
    25. Nonlinear effects of structured beams in classical and quantum optics experiments
      26. weekly webinar arranged by SPIE, OSA and OSI student chapters in association with the Department of Applied Optics and Photonics, 12 September 2021, University of Calcutta, Calcutta.
    26. Structured beam optical parametric oscillator based mid-IR sources
      27. Student Conference on Photonics and Quantum Technology (SCPQT), 24-26 February, 2021, National Institute of Science Education and Research, Bhubaneswar.
    27. Orbital angular momentum transfer in classical and quantum optics experiments
      28. OSA High-brightness Sources and Light-driven Interactions Congress, 16-20 November 2020.
    28. Spatial structured optical beams
      29. SRM Institute of Science and Technology, Chennai, 16 May 2020.
    29. Contemporary Optics at Physical Research Laboratory: Structured optical beams
      30. Symposium on Intense Laser Application and Innovation, 27-29 January 2020, TIFR Hydrabad.
    30. Classical and quantum implementation of structured optical beams
      31. 107th Indian Science Congress, 3-7 January 2020, University of Agriculture and Science, Bangalore.
    31. High brightness entangled photon source for quantum communication
      32. International Symposium on Quantum Information Technology, ISQIT 2019, 2-5 December 2019, Pune.
    32. Structured optical beams
      33. Contemporary Trends in Optics 2019, 20-23 May 2019, IISER Kolkata.
    33. Nonlinear generation of structured optical beams
      34. Facets of Photonics- 2018, 24-26 December 2018, IISER Pune.
    34. Structured beams coherent radiation and their applications
      35. Recent Advances in Photonics, 22nd September, 2018, Manipal University, Manipal, Karnataka.
    35. Nonlinear interaction of structured beams
      36. Workshop on Experimental Techniques in Physics, 4-14 June, 2018. Institute of Advanced Research (IAR), Gandhinagar.
    36. High repetition rate, ultrafast parametric sources of structured beams
      37. Ultrafast Science 2017 (UFS-2017), University of Hyderabad, Hyderabad, India, Novemeber 02-04, 2017.
    37. Lecture for ICO/ICTP Gallieno Denardo Award for Optics in 2017 in the Winter College on Optics
    38. Nonlinear frequency conversion of structured beams and Airy beam optical parametric oscillator
      39. Photonics West, San Francisco, USA, January 28- February 2, 2017.
    39. Structured beam parametric sources and optical parametric oscillators
      40. 25th DAE BRNS National Laser Symposium (NLS-25), KIIT University, Bhubaneswar, India, December 20-23, 2016.
    40. Structured laser beams and novel applications
      41. 7th EPS-QEOD EUROPHOTON CONFERENCE, Vienna, Austria, August 21-26, 2016.
    41. Structured beam optical parametric oscillators
      42. Recent Advances in Optical Sciences-II, School of Physics, University of Hyderabad, Hydrabad, India, May 6-7, 2016.
     Prizes and Awards

    1. Mr. Sandeep Singh has received the best PhD thesis award for his thesis titled, Generation and Characterization of Pair Photons for Quantum Sensing Applications, by Indian Lasers Association in 32nd DAE-BRNS National Laser Symposium, RRCAT, Indore, 29 Jan to 1 Feb 2024.

    2. Ms. Chahat Kaushik has received the best poster award for the paper, Geometric phase induced tunable optimum output coupling in optical parametric oscillators, in 32nd DAE-BRNS National Laser Symposium, RRCAT, Indore, 29 Jan to 1 Feb 2024.

    3. Mr. Anirban Ghosh has received the best poster award for the paper, Experimental Observation of Optical Hilbert's Hotel in Vector Beam, in 32nd DAE-BRNS National Laser Symposium, RRCAT, Indore, 29 Jan to 1 Feb 2024.

    4. Mr. Sandeep Singh has received DST international travel grant to attend Frontiers in Optics + Laser Science (FiOLS) during 23-26 September 2023, Denver, Colorado, USA to present his work on Quantum Sensing.

    5. Mr. Anirban Ghosh has received URSI Young Scientist Award to attend URSI General Assembly and Scientific Symposium (URSI GASS 2023) at Sapporo, Japan during 18 - 27 August 2023 for his the work "Hilbert Hotel: An experimental realization in polarization topological vortex beam:.

    6. Mr. Anirban Ghosh has received outstanding poster presentation award for the paper "Nonlinear generation of ultrafast, high power, higher order vector vortex beams" presented in the Summer school in Optics and Applied Photonics, Indian Institute of Science, Bangalore, held during 17-21 June 2019.

    7. Mr. Varun Sharma has received travel grant student award in recognition of his outstanding scientific contribution to CLEO/EUROPE-EQEC 2019, 23-27 JUNE 2019, MUNICH, GERMANY from European Physical Society (EPS).

    8. Mr. Varun Sharma has been selected to participate in the 69th Lindau Nobel Laureate Meeting taking place from 30 June to 05 July 2019 in Lindau, Germany.

    9. Mr. Varun Sharma has received travel grant student award in recognition of his outstanding scientific contribution to Europhoton Conference 2018 from European Physical Society (EPS) and EPS Young Minds.

    10. Mr. Varun Sharma has received the best student poster contribution award at the Europhoton Conference, Barcelona, Spain during 02 - 07 September 2018.

    11. Mr. Jabir M. V. has received Incubic / Milton Chang travel grant for the paper, Generation of hybrid entangled two photon state using classical non-separable state of the pump beam, at the Frontiers in Optics Conference in Washington DC, USA, September 16-20, 2017.

    12. Mr. Jabir M. V. has received the best poster award for the paper, Structuring of entangled photons using structured classical pump beam, in 25th DAE BRNS National Laser Symposium, KIIT University, Bhubaneswar during December 20-23, 2016.

    13. Mr. Apurv Chaitanya N. has received best poster award in International Conference on Fiber Optics and Photonics - PHOTONICS 2016, IIT Kanpur, during December 4-8, 2016.

    14. Dr. Apurv Chaitanya N., has received OSA Foundation travel grant for the paper, Nonlinear generation of high power and higher order hollow Gaussian beam, in Fontier in Optics Conference, University of Rochester, USA, October 17-21, 2016.

    15. Mr. Jabir M. V. has received European Physical Society grant for young scientist for the paper, Generation of laser beam in variable sized perfect vortex spatial structure and its interaction with nonlinear crystal, in 7th EPS-QEOD Europhoton Conference, Vienna, Austria, August 21-26, 2016.

    16. Dr. A. Aadhi has received European Physical Society grant for young scientist for the paper, High repetition rate Airy beam pulses in higher-harmonic fractional cavity, in 7th EPS-QEOD Europhoton Conference, Vienna, Austria, August 21-26, 2016.

    17. Mr. Apurv Chaitanya N. has received best poster award for the paper, Nonlinear generation of perfect vortex beam, in RAOS-2016 conference, Hydrabad University, May 6-7, 2016.

    18. Dr. A. Aadhi has received best poster presentation sponsored by SPIE for the paper, Generation of 2.5 GHz repetition rate femto-second Airy beam radiation, at the Winter College on Optics: Optical Frequency Combs held at ICTP, Trieste, Italy during February 2016.

    19. Dr. A. Aadhi, has received Incubic / Milton Chang travel grant and OSA Foundation travel grant from the Optical Society of America (OSA) in recognition of our work, Airy beam optical parametric oscillator at the Frontiers in Optics Conference in San Jose, USA, October 18-22, 2015.

    20. Mr. Jabir M. V. has received the best poster award for the paper, Study of angular spectrum of spontaneous parametric down converted photons using variable size perfect vortex beam, in 24th DAE BRNS National Laser Symposium, RRCAT, Indore, December 2-5, 2015.

    21. Mr. Apurv Chaitanya N., has received student presentation award for the paper, Frequency-doubling of ultra-fast laser in thick nonlinear crystal from SPIE, USA during the conference ICOP 2015, held in Calcutta University, February 20-22, 2015.

    22. Mr. Apurv Chaitanya N., has received best poster presentation award for the paper, Optimization of frequency-doubling of high power, high repetition rate, femtosecond fiber laser in thick nonlinear crystal, in Photonics, IIT Kharagpur, December 13-16, 2014.

    23. Mr. Apurv Chaitanya N., has received best poster award for the paper, Optimum frequency-doubling of ultrafast laser in thick crystals in presence of both temporal and spatial walk-off, during National Laser Symposium, Tirupoti, December 3-6, 2014.

    24. Mr. A. Aadhi, has received best presentation award for the paper, High-power, continuous-wave, solid-state tunable source for the ultraviolet, during International Conference on Optics & Optoelectronics, Instruments Research & Development Establishment, Dehradun, March 5-8, 2014.

    Top Downloads
    1. Watt-level, ultrafast, tunable yellow source based on single-pass, fourth-harmonic generation of Cr2+:ZnS laser at 2360 nm, Optics Letters, 45, 5109-5112 (2020), 7th paper of the list of TOP TEN downloaded papers of Optics Letters in the month of September 2020

    2. Robust, high brightness, degenerate entangled photon source at room temperature, Scientific Reports 7, 12613 (2017), ranked 47th of the top 100 download papers in Physics of Scientific Reports out of 3000 papers published in 2017

    3. High power, high repetition rate, tunable broadband mid-IR source based on single-pass optical parametric generation of a femtosecond laser, Optics Letters, 42, 2886-2889 (2017), in the list of TOP TEN downloaded papers of Optics Letters in consecutive months, July and August 2017

    4. Ultrafast optical vortex beam generation in the ultraviolet, Optics Letters, 41, 2715-2718 (2016), 3rd paper of the list of TOP TEN downloaded papers of Optics Letters in the month of June 2016. It is also one of the top downloaded articles in the field of Nonlinear Optics in Optics Letters in 2015-2016.

    5. All-periodically poled, high-power, continuous-wave, single-frequency tunable UV source," Optics Letters 40, 33-36 (2015), Top downloaded articles on Nonlinear Optics in Optics Letters

    6. High-power, high-repetition-rate, Yb-fiber laser based femtosecond source at 355 nm, Optics Letters, 40, 4269-4272 (2015), 10th paper of the list of TOP TEN downloaded papers of Optics Letters in the month of September 2015

    7. Frequency-modulation-mode-locked optical parametric oscillator, Optics Letters, 37, 115-117 (2012), 9th paper of the list of TOP TEN downloaded papers of Optics Letters in the month of January 2012

    8. Stable, 9.6 W, continuous-wave, single-frequency, fiber-based green source at 532 nm, Optics Letters, 34, 1561-1563 (2009), 7th paper of the list of TOP TEN downloaded papers of Optics Letters in the month of May 2009

    9. Stable, High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO4, Optics Letters, 33, 2955-2957 (2008), 8th paper of the list of TOP TEN downloaded papers of Optics Letters in the month of December 2008

     Magazines

    1. Dual-wavelength, two-crystal, continuous-wave optical parametric oscillator, Optics Letters, 36 , 3033-3035 (2011), has been highlighted by Laser Focus World in the News break section, 2011 (more).

    2. Multicrystal, continuous-wave, single-pass second-harmonic generation with 56% efficiency, Optics Letters 35, 3513-3515 (2010), has been highlighted by Laser Focus World in the World News section, 2011 (more).

    3. Continuous-wave optical parametric oscillator pumped by a fiber laser green source at 532 nm, Optics Letters, 34, 2255-2257 (2008), has been highlighted by Virtual Journal of Ultrafast Science in September 2009 (more).

    4. Continuous-wave, single-frequency, solid-state blue source for the 425-489 nm spectral range, Optics Letters, 33, 1228-1230 (2008), has been highlighted by Laser Focus World, News break section, 2008 (more), Optics.org (more) and Optics and Laser Europe, issue 165, pp 12, October 2008 (more).
  • Cover Pages

    1. Simple experimental realization of optical Hilbert Hotel using scalar and vector fractional vortex beams, APL Photonics, 8, 066105 (2023), was published in the Cover page of APL Photonics in the month of June 2023

    2. Single-frequency, high-power, continuous-wave fiber-laser-pumped Ti:sapphire laser, Applied Optics, 51, 15-20 (2012), was published in the Cover page of Applied Optics in the month of January 2012

    3. Stable, 9.6 W, continuous-wave, single-frequency, fiber-based green source at 532 nm, Optics Letters, 34, 1561-1563 (2009), was published in the cover page of Cover page of KIRAN 2010, news letter of Indian Laser Association (ILA)

     PhD Thesis

      High-power, continuous-wave optical parametric oscillators from visible to near-infrared
      Selected for the BEST THESIS Award of Indian Laser Association (ILA) in the National Laser Symposium, 2009 held in BARC, Mumbai

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