Backward SRS suppression of picosecond pulses in water upon moving the pump beam waist from the water volume through the surface

IF 0.9 4区工程技术 Q3 Engineering

Quantum Electronics Pub Date : 2022-03-01 DOI:10.1070/qel18005

S. M. Pershin, A. I. Vodchits, I. Khodasevich, V. Orlovich, A. Kudryavtseva, N. V. Tcherniega

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引用次数: 1

Abstract

We report, for the first time to our knowledge, suppression of backward stimulated Raman scattering (BSRS) of picosecond pulses (57 ps, 532 nm) due to the development of optical breakdown in the surface (0 – 3 mm) water layer with a shift of the beam waist (lens focal length of 83 mm) to the water – air interface without changing the pump pulse energy (∼1.3 – 1.5 mJ). In this case, SRS generation in forward direction is observed even in the presence of breakdown. When the focal plane coincides with the surface, the BSRS generation is restored without optical breakdown, despite an increase in the pump radiation intensity due to a decrease in the beam diameter. It is significant that the optical breakdown threshold in the water volume was unattainable even with an increase in the pump pulse energy by more than an order of magnitude – up to 16 mJ. The mechanism of self-consistent summation of nonlinear optical processes, such as electrostriction, beam self-focusing, beam phase conjugation, and BSRS pulse compression is discussed.

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将泵束腰从水的体积穿过表面移动后，水中皮秒脉冲的反向SRS抑制

据我们所知，我们首次报道了皮秒脉冲(57 ps, 532 nm)的后向受激拉曼散射(BSRS)的抑制，这是由于在表面(0 - 3 mm)水层中发展光学击穿，将光束腰(透镜焦距为83 mm)移动到水-空气界面，而不改变泵浦脉冲能量(~ 1.3 - 1.5 mJ)。在这种情况下，即使存在击穿，也可以观察到正向的SRS产生。当焦平面与表面重合时，尽管由于光束直径减小而增加了泵浦辐射强度，但仍能恢复BSRS的产生，而不会发生光击穿。值得注意的是，即使泵浦脉冲能量增加超过一个数量级(高达16 mJ)，水体积的光击穿阈值也无法达到。讨论了电致伸缩、光束自聚焦、光束相位共轭和BSRS脉冲压缩等非线性光学过程自洽求和的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quantum Electronics 工程技术-工程：电子与电气

CiteScore

3.00

自引率

11.10%

发文量

审稿时长

3-6 weeks

期刊介绍： Quantum Electronics covers the following principal headings Letters Lasers Active Media Interaction of Laser Radiation with Matter Laser Plasma Nonlinear Optical Phenomena Nanotechnologies Quantum Electronic Devices Optical Processing of Information Fiber and Integrated Optics Laser Applications in Technology and Metrology, Biology and Medicine.