It is shown by optical methods using light scattering intensity and shift of the stimulated low- frequency Raman scattering line that emulsion particles of the Emulson EM-1 lubricant-coolant are not...

This paper demonstrates a significant increase in the efficiency of second-harmonic generation in a suspension of lithium niobate (LiNbO₃) particles during freezing at nano and picosecond pum pulse durations. The amplification is caused by the formation of close-packed structures during the solidification process. The energy dependences of the second-harmonic generation, the angular distributions of the scattering intensity, conversion coefficients and the scattering regime in a suspension and in other lithium niobate particle-based samples are studied. This effect can be used for phase transition sensing in a medium, visualization of the particle organization process in ice-templating, and significantly increasing the efficiency of other nonlinear effects in particle matter.

In this work, for the first time, the property of particles to form close-packed layer in front of the freezing interface was used to increase the luminescent efficiency response for ruby and titanium-sapphire microcrystals water suspensions. An increase in the efficiency of luminescence response due to an increase in the concentration of particles at the freezing front, can be used for phase transition sensing. In addition, particles packing by freezing method can be used for tuning random laser generation or increasing the efficiency of different nonlinear optical effects in suspensions of particles.

Intracavity stimulated low-frequency Raman scattering on elastic vibrations of submicrometer latex particles in an aqueous suspension is experimentally implemented for the first time.

The paper proposes and investigates a method for increasing the sensitivity of laser-induced breakdown spectroscopy by directed freezing of particle suspen

The results of experimental observation of stimulated low-frequency Raman scattering (SLFRS) in a single-crystal diamond with a buried graphitized layer created as a result of nonlinear interaction of high-power nanosecond laser pulse with eigen oscillations of nanosized layers of diamond-graphite structures are presented. It is demonstrated that the frequency shift of the SLFRS is on the order of 10 GHz and is inversely proportional to geometrical dimensions of the nanolayers composing the structure.