[Phys-seminars] 2018-03-15 Lasers Seminar

barmash barmash at bgu.ac.il
Thu Mar 8 18:53:15 IST 2018

Lasers Seminar

 DATE: 15-03-18

 TIME: 15:30

 PLACE: Physics building (#54) room 207

Efficient frequency conversion by stimulated Raman scattering in aqueous solutions of nitrate salts

Zion Hazan, Department of Physics, Ben-Gurion University of the Negev

Stimulated Raman scattering (SRS), a nonlinear inelastic light scattering process resulting from the interaction of pump lasers with Raman active media, is an appealing technique for generation of radiation at new wavelengths. Here, we investigated experimentally the SRS of a single pass pump beam, frequency-doubled Nd:YAG laser [green (532 nm), 5 ns], through cells of different lengths, containing aqueous solutions of saturated sodium nitrate. Efficient frequency conversion of the pump, to 1st [yellow (564 nm)] and 2nd [orange (599 nm)] Stokes was achieved by SRS and four-wave mixing (FWM) processes. The dependencies of the measured rising energies of the Stokes components vs. the pump energies were validated by a newly developed numerical model, accounting for the involved physical processes. The numerical computations revealed that the 1st Stokes was generated from the pump laser, while the onset and amplification of the 2nd Stokes were atypically obtained through FWM. T
 hese results reinforce the significant role played by self-induced thermal defocusing of the involved beams. The high frequency conversion efficiencies that were obtained show that realization of yellow, a hard achievable zone, from green is easily achievable.

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