Institute of Optoelectronics, Military University of Technology, ul. gen. S. Kaliskiego 2, 00-908 Warsaw, Poland.
Opt Lett. 2012 Jul 1;37(13):2598-600. doi: 10.1364/OL.37.002598.
A scheme of self-adaptive, closed-loop, diode-side-pumped Nd:YAG slab laser was presented. As a result of four-wave mixing of standing waves intersecting at a small angle in a closed-loop cavity, the self-adaptive process of beam cleaning leading to fundamental mode operation despite severe asymmetry of the inversion profile and thermal-optical distortion was achieved. The output beam was extracted from the cavity as the first- order diffraction beam on the dynamic gain gratings created in an active medium. The near-diffraction-limited (parameter M(2)<1.4, divergence of 1 mrad) output beam of 250 mJ energy and the optical slope efficiency of 30% at a repetition rate of up to 25 Hz in a free-running regime were demonstrated.
提出了一种自适应、闭环、二极管端面泵浦 Nd:YAG 板条激光器方案。由于在闭环腔中相交的驻波的四波混频，实现了光束净化的自适应过程，导致尽管反转轮廓和热光变形严重不对称，但仍能实现基模运转。输出光束从腔中提取，作为在有源介质中产生的动态增益光栅上的一级衍射光束。在自由运行模式下，在重复频率高达 25 Hz 时，演示了具有 250 mJ 能量的近衍射极限（参数 M(2)<1.4，发散角为 1 mrad）输出光束和 30%的光斜率效率。
