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.
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 109, No. 7, pp. 447–451.
This work was supported by the Russian Foundation for Basic Research (project no. 18-52-00038 Bel_a, which was received at the international competition of Russian—Belarusian projects).
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Pershin, S.M., Grishin, M.Y., Lednev, V.N. et al. Anomalous Decrease in the Threshold of Stimulated Raman Scattering near the Surface of Liquid Nitrogen. Jetp Lett. 109, 437–440 (2019). https://doi.org/10.1134/S0021364019070105
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DOI: https://doi.org/10.1134/S0021364019070105