S. M. Pershin, M. Ya. Grishin, V. N. Lednev, P. A. Chizhov, “Anomalous decrease in the threshold of stimulated Raman scattering near the surface of liquid nitrogen”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2019, Volume 109, Issue 7,Pages <nobr>447

This article is cited in 8 papers

OPTICS AND NUCLEAR PHYSICS

Anomalous decrease in the threshold of stimulated Raman scattering near the surface of liquid nitrogen

S. M. Pershin^a, M. Ya. Grishin^ab, V. N. Lednev^a, P. A. Chizhov^a

^a Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia
^b Moscow Institute of Physics and Technology, State University, Dolgoprudnyi, Moscow region, Russia

Abstract: An anomalously strong (up to 13 times) reduction of the threshold of the stimulated Raman scattering of 15-ps laser pulses in liquid nitrogen has been found when moving the caustic of a pump beam from the bulk through the free surface. A nonmonotonic N-shaped dependence of the stimulated Raman scattering threshold on the distance of the beam waist to the surface has been recorded for the first time with a minimum reached when the plane front of the beam caustic coincides with the surface. The physical mechanism of the detected phenomenon has been discussed.

Received: 29.01.2019
Revised: 29.01.2019
Accepted: 07.02.2019

DOI: 10.1134/S0370274X19070038