Вынужденное комбинационное рассеяние 0.3-ps лазерных импульсов с длиной волны 515 nm в кристаллах Ca-=SUB=-3-=/SUB=-(VO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=- и Ca-=SUB=-0.27-=/SUB=-Sr-=SUB=-0.3-=/SUB=-(VO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=-

Abstract

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 J 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.