TY - JOUR
T1 - Implications of thermal lensing and four-wave mixing on stimulated Raman scattering in an aqueous solution of sodium nitrate
AU - Ganot, Yuval
AU - Hazan, Zion
AU - Barmashenko, Boris D.
AU - Bar, Ilana
N1 - Funding Information:
This research was supported by a research grant from the Sapir College research fund and the Israel Science Foundation (ISF).
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Stimulated Raman scattering (SRS) is an effective technique for imaging, spectroscopy and for frequency conversion of lasers in all states of matter. Yet, controlling SRS frequency conversion efficacy is a great challenge, due to ensuing competing scattering processes and laser-induced thermal lensing (TL). Here, we focus on both SRS and the associated processes occurring during frequency conversion in an aqueous solution of sodium nitrate. It is demonstrated that SRS efficiently converts 532 nm nanosecond laser pulses, via a single pass through the solution. In this light-matter interaction, SRS along with four-wave mixing (FWM) converted the pump beam to collinear beams of the 1st [yellow (564 nm)] and 2nd [orange (599 nm)] Stokes of the NO3 − ion symmetric stretch. The experimental results were well reproduced by a newly developed numerical model. Based on the experimental and numerical results, it was found that the 1st Stokes is generated through SRS of the pump laser, while the onset and growth of the 2nd Stokes were obtained through FWM. The results also reveal the significant role played by SRS induced TL, growing over many laser pulses, suggesting its substantial contribution and importance.
AB - Stimulated Raman scattering (SRS) is an effective technique for imaging, spectroscopy and for frequency conversion of lasers in all states of matter. Yet, controlling SRS frequency conversion efficacy is a great challenge, due to ensuing competing scattering processes and laser-induced thermal lensing (TL). Here, we focus on both SRS and the associated processes occurring during frequency conversion in an aqueous solution of sodium nitrate. It is demonstrated that SRS efficiently converts 532 nm nanosecond laser pulses, via a single pass through the solution. In this light-matter interaction, SRS along with four-wave mixing (FWM) converted the pump beam to collinear beams of the 1st [yellow (564 nm)] and 2nd [orange (599 nm)] Stokes of the NO3 − ion symmetric stretch. The experimental results were well reproduced by a newly developed numerical model. Based on the experimental and numerical results, it was found that the 1st Stokes is generated through SRS of the pump laser, while the onset and growth of the 2nd Stokes were obtained through FWM. The results also reveal the significant role played by SRS induced TL, growing over many laser pulses, suggesting its substantial contribution and importance.
KW - Aqueous solution of sodium nitrate
KW - Stimulated Raman scattering generation
KW - Thermal lensing and four-wave mixing
UR - http://www.scopus.com/inward/record.url?scp=85080028289&partnerID=8YFLogxK
U2 - 10.1016/j.optlastec.2020.106169
DO - 10.1016/j.optlastec.2020.106169
M3 - Article
AN - SCOPUS:85080028289
SN - 0030-3992
VL - 127
JO - Optics and Laser Technology
JF - Optics and Laser Technology
M1 - 106169
ER -