环形非稳腔倒向波抑制的计算分析

Computational analysis of unstable ring resonator with RWS

通过自洽方程,计算带有倒向波抑制镜的环形非稳腔正、倒向波的稳定过程。通过改变腔长、放大率等参数计算,发现使用倒向波抑制镜能明显提高正向波的输出,并能抑制倒向波。当正、倒向波的频率重合时,竞争最大,抑制效果最好,正向波输出功率有所下降。对于特定的结构,存在最佳的放大率,使正向波的输出最大。通过 FFT 方法,可知环形输出功率增大,光束质量下降。计算所得的结果表明,抑制镜的引入能增大输出功率,可根据结果选择合适的参数。

With the help of the self-consistent-equation,computation results show that reverse-wave-suppressor (RWS) can increase the output of forward wave.When forward and reverse wave compete for the same particles,RWS ratio gets high and forward wave output declines.To a certain resonator,a best magnitude can be got.With the help of FFT method,it shows that the intensity of the output annular increases and the laser quality descends when using RWS. All these computation are useful for practical unstable ring laser design.