The influence of reflective Bragg gratings that are formed in an active medium due to the spatial periodic modulation of gain on the spectral properties of lasing are investigated by an example of a pulsed Nd : YAG laser. It is shown that, at a certain choice of the formation regime of reflective gratings of gain, the lasing bandwidth can be reduced by a factor of 3 – 5, with a corresponding increase in the pulse energy and significant improvement of spatial beam quality.

中文翻译：

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增益全息反射式布拉格光栅及其在大功率脉冲激光器工作中的作用

通过一个脉冲Nd：YAG激光器实例研究了由于增益的空间周期性调制而在有源介质中形成的反射式布拉格光栅对激光光谱特性的影响。结果表明，在一定范围内选择增益反射光栅的形成方式时，激光发射带宽可以减小3-5倍，脉冲能量相应增加，空间光束质量得到显着改善。