K. I. Zemskov

Experimental observation of stimulated low-frequency Raman scattering in water suspensions of silver and gold nanoparticles.

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.

Possible ionic systems for the development of a pulsed laser on the basis of ion-ion recombination: II. Recombination with oxygen, sulfur, selenium, and tellurium negative ions

Pairs of positive and negative ions, which can be used for the creation of a pulsed ion-ion recombination laser, are considered. Pairs for recombination with negative ions in which the electron affinity is lower than in halogens are analyzed. Such a choice ensures a significant increase in the number of working atoms and allows the consideration of new ways to obtain the inversion in the process of ion-ion recombination.