环形非稳腔倒向波抑制镜抑制效果的数值模拟

Numerical Stimulation for Reverse Wave Suppressor in Unstable Ring Resonator

对环形非稳腔激光器做数值计算模拟,给带有倒向波抑制(RWS)镜的环形非稳腔激光器的设计提供了数值参考。通过自洽方程,用Matlab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。改变腔长、放大率等参数来计算,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。气体分子的多普勒频移导致正、倒向波的频率变化。频率分开的越小,竞争越大,抑制效果越好,正向波输出功率则有所下降。对于特定的结构,存在最佳的放大率,使正向波的输出最大。计算结果表明,倒向波抑制镜的引入能增大环形非稳腔输出功率。计算结果对实际环形非稳腔的设计十分有用。

In order to provide best parameters for unstable ring resonators with reverse-wave-suppressor （RWS）, it is necessary to make numerical simulation. With the help of the self-consistent-equation, Matlab computation results show that RWS can increase the output of forward wave and suppress the reverse wave in unstable ring resonators, by changing the parameters such as the length and magnification of resonator. When forward wave and reverse wave compete for the same particles, which is caused by Doppler frequency shift, suppression ratio of RWS gets high while forward wave output declines. To a certain resonator, a best magnitude can be got to provide the best output amplitude. Results show that introduction of RWS can increase the output of unstable ring resonators. All these computational results are useful for practical unstable ring laser design.