研究目的
Investigating the nonlinear refraction in a number of crystals (KGW, KGW:Eu3+, Ba(NO3)2, BaWO4, PbMoO4, and CdWO4) that are promising for excitation of multifrequency stimulated Raman scattering by a single-beam Z-scan method using picosecond laser pulses with a wavelength of 1064 nm generated by a YAG:Nd3+ laser.
研究成果
By using the single-beam Z-scan method, we thus obtained the dependences of normalized intensity of the directed secondary radiation on the Z coordinate. The dependences reveal the regions of attenuation and enhancement of the radiation intensity registered by detector D3. Quantitative data on the nonlinear refraction (the values of n2) were obtained for a number of oriented plates of KGW, KGW:Eu3+, Ba(NO3)2, BaWO4, PbMoO4, and CdWO4 single crystals.
研究不足
The nonlinear absorption coefficient was very small (within the experimental error) in all studied crystals when using a laser with a wavelength of 1064 nm as a source of probe radiation. This result can be attributed to the fact that the edge of the fundamental electronic absorption band in the studied materials lies in the short-wavelength region of the spectrum, so that the two-photon transitions (λ = 532 nm) fall into the transparency range of the studied dielectric media.
