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- 2022
Stimulated Raman scattering of 0.3-ps 515 nm laser pulses in Ca3(VO4)2 and Ca0.27Sr0.3(VO4)2
The prospects of SRS-active calcium/strontium orthovanadate crystals, (Ca3(VO4)2 and Ca2.7Sr0.3(VO4)2), for spectral conversion of ultrashort visible-range laser pulses evaluated in a single-pass scheme with pump focusing into the samples. For the 3 μJ incident laser pulses of 0.3 ps duration at wavelength of 515 nm the energy conversion efficiency of up to ~3.5% to the Stokes component shifted in frequency by ~850 cm-1 obtained in a 1.3 cm long sample of Ca2.7Sr0.3(VO4)2 crystal. Simultaneously, in the transmitted radiation spectrum the amplitude of Stokes component reached 1/3 of the amplitude at the pump wavelength. Under the same conditions, SRS in a Ca3(VO4)2 crystal was not detected at all. It was shown that the observed differences can be explained by the attenuation of pump pulse due to difference in two-photon absorption in these crystals. Keywords: stimulated Raman scattering, two-photon absorption, Ca3(VO4)2; femtosecond pulses. DOI: 10.61011/EOS.2023.02.55785.8-23
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