Stimulated rotational Raman scattering in air with diverging beam
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摘要: 研究强激光长程空气传输受激转动拉曼散射(SRRS)效应，寻求抑制措施是高功率固体激光驱动器建造中需要解决的关键问题之一。采用数值模拟的方法研究了发散光长程空气传输SRRS效应的演化规律，通过几何近似理论推导了该效应有效建立时的强度距离乘积阈值和抑制判据。结果表明：发散光长程空气传输SRRS效应的建立速度小于平行光，二者阈值有理论关系；能够有效抑制SRRS效应的发散角设计判据由光束口径、激光强度及安全传输距离决定。Abstract: Investigation on stimulated rotational Raman scattering (SRRS) in air with high power laser to seek suppression methods is one of the key issues which needs to be addressed in the construction of high-power solid-state laser driver. The evolution of SRRS with diverging beam is studied numerically. The threshold of the intensity-path-length product and the criterion to suppress SRRS using diverging beam are established by geometric approximation. The results show that the effect of SRRS grows slowly in diverging beam, choosing proper divergence angle can suppress SRRS effectively, and the angle depends on the beam size, laser intensity and propagation distance.
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