拉盖尔-高斯激光模式受激布里渊散射的新现象:理论、计算和实验

F. Starikov, Y. Dolgopolov, A. V. Kopalkin, G. Kochemasov, S. M. Kulikov, S. Sukharev
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引用次数: 2

摘要

先前预测到的新现象——聚焦激光束的受激布里渊散射(SBS)中相位共轭失效的实验证实了涡旋光束的相位共轭不作为一种现象是由于未能选择与激光相共轭的斯托克斯模式。这是因为SBS放大系数不依赖于激光场相位,斯托克斯场不会“感觉到”激光相位螺旋是如何扭曲的。因此,斯托克斯共轭模态和相反螺旋度的类似模态的放大系数是相等的。例如,在环形激光LG01模式的情况下,斯托克斯光束由几个模式(包括共轭模式)的随机叠加组成。对于相当宽的涡旋光束(例如,在具有两个环的激光LG11模式的情况下),会发生一种新的现象,可以称为SBS的相变。其实质是在Stokes光束中选择一个与激光模完全正交的具有规则相位前的模。在近阈值SBS模式下,所选模式接近主高斯模式。在涡旋激光束的SBS处,涡旋高超声速波在SBS介质中产生,使得“斯托克斯波+高超声速波”体系的拓扑电荷等于入射激光波的电荷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New phenomena at stimulated Brillouin scattering of Laguerre-Gaussian laser modes: theory, calculation, and experiments
New phenomenon predicted earlier - failure of phase conjugation at the stimulated Brillouin scattering (SBS) of focused laser beams with screw dislocation of phase front (Laguerre-Gaussian vortex modes) - has been experimentally confirmed Phase conjugation of vortex beams does not take place as a phenomenon because of failure of selection of Stokes mode conjugated to laser one. It occurs since the SBS amplification coefficient does not depend on the laser field phase, and the Stokes field does not "feel" how the laser phase helix is twisted. Therefore the amplification coefficients of a Stokes conjugated mode and an analogous mode of opposite helicity are equal to each other. For example, in the case of a doughnut laser LG01 mode the Stokes beam consists of a random superposition of a few modes including conjugated one. For rather wide class of vortex beams (for example, in the case of a laser LG11 mode with two rings), a novel phenomenon takes place that can be called as phase transformation at SBS. Its essence is in the fact that in Stokes beam a mode with regular phase front is selected, which is orthogonal to laser mode at all. In the near-threshold SBS regime, this selected mode is close to a principal Gaussian mode. At SBS of the vortex laser beam the generation of the vortex hypersonic wave takes place in the SBS-medium so that the topologic charge in the system "Stokes wave+hypersonic wave" is equal to the charge of incident laser wave.
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