GT干涉仪压缩光脉冲的理论和实验研究

对增益开关半导体激光器产生的有啁啾光脉冲经ＧＴ干涉仪的脉定压缩效应进行了理论和实验研究。ＧＴ干涉仪由相互平行的全反射镜和部分反射镜组成。干涉仪的反射率恒等于１，其色散曲线呈周期性变化。在一个周期内，色散有正有负。调节二镜间距，使其具有适当的色散特性，可用来压缩光脉冲。理论计算和实验结果均表明，压缩后光脉冲形状随ＧＴ干涉仪反射镜间距的变化而变化。在某种情况下，光脉冲呈分裂状。在适当的条件下，可得到很好的压缩效果。实验得到最窄光脉冲的脉宽为 ５．５ ｐｓ，压缩比为 ８．４。

Theoretical and experimental research of compresssed optical pulses by Gires-Tournois interferometer

The way in which the chirped optical pulses from gain-switched semiconductor laser are compressed by Gires--Tournois (GT) interferometer is studied experimentally and theoretically. The GT interferometer consists of two parallel mirrors with all reflection and partial reflection. The reflection index of the GT interferometer is always 100%, but the dispersion curves change with the distance between two mirrors periodically. In one period, the dispersion is positive or negative in different optical frequency, changing the distance between two mirrors to get the suitable dispersion, the pulses can be compressed. The results of the theoretical computation and experiments both show that the sharp of optical pulses after compression depends on the distance between two mirrors of GT interferometer. Under some condition, the pulses are split. With suitable parameters of GT interferometer, very good compression effect can be obtained. In experiments, the width of the narrowest pulses is 5. 5 ps,the compression ratio is 8. 4.