The experimental investigations of the interaction of the pulsed laser radiation with different types of thin films are presented. Polycluster diamond films, aluminum nitride films, and indium tin oxide films were investigated. A high efficiency inelastic scattering of light due to optoacoustic interaction was registered. The spectral features of the scattered light are defined by the morphology of the samples.

In this Letter we report on experimental observation of stimulated low-frequency Raman scattering (SLFRS) in gold and silver nanoparticle suspensions excited by 20 ns ruby laser pulses, SLFRS propagated in forward and backward directions with a maximum conversion efficiency up to 20%. Frequency shift for silver nanoparticle suspension was found to be 0.33 THz and for gold nanoparticle suspension 0.435 THz. This type of stimulated scattering of light can be used as an effective source of biharmonic pumping for solving a large number of practical tasks.

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We report the results of an experimental study on the temporal and spectral response of organic liquids luminescence excited by UV radiation at liquid-nitrogen temperature. The afterglow at liquid-nitrogen temperature was detected with a decay time of the order of 1000 ms. We have revealed that the afterglow appears at a definite temperature of about 80 K.

Laser pulses interaction with tobacco mosaic virus (TMV) in Tris-HCl pH7.5 buffer and in water has been investigated. 20 ns ruby laser pulses have been used for excitation. Spectrum of the light passing through the sample was registered with the help of Fabri-Perot interferometer. In the case of TMV in water we observed in the spectrum only one line of the exciting laser light, for TMV in Tris-HCl pH7.5 buffer second line appeared, corresponding to the stimulated low-frequency Raman scattering (SLFRS) on the breathing radial mode of TMV. SLFRS frequency shift by 2 cm -1 , (60 GHz), conversion efficiency and threshold are measured for the first time to the best of our knowledge.