Date : 05-02-2018
Time : 00:16:00
Speaker : Mr. Varun Sharma
Senior Research Fellow
Area : Atomic, Molecular and Optical Physics
Venue : Room No: 113, PRL Thaltej
Optical parametric oscillators (OPO) have proved their versatility as a source of coherent radiation over a wide range of wavelengths, which is not possible to achieve with conventional Lasers. For example, the mid-IR wavelength range which is also known as fingerprinting region due to the presence of fundamental absorption bands of various molecules and widely used for high resolution molecular spectroscopy, can not be accessed without the use of nonlinear parametric processes and or OPOs. The OPO sources conventionally produce output radiation in Gaussian intensity distribution. However, generating mid-IR radiation in vortex spatial intensity profile, one can extend the advantages of such sources in terms both spectral and spatial parameters. Using a PPLN based OPO we have transferred optical vortices at near-IR wavelength directly to the mid-IR region and produced high power and higher order optical vortices continuously tunable across 2.3 μm to 3.3 μm. In this talk, I will discuss about the generation technique for optical vortices in mid-IR and their characteristics.