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根据钛宝石激光器的要求设计了性能优良的两种负色散镜(NDM1和NDM2)。NDM1同时引入啁啾效应和G-T效应产生大的群延迟色散量以减少光在负色散镜上的反射次数。NDM2仅引入G-T效应产生较小的群延迟色散以补偿腔内自相位调制带来的部分啁啾。选用离子束溅射法制备了这两种负色散镜。用分光光度计测试了它们的透射率。结果表明,所制备的负色散镜的性能与设计性能非常接近。使用这两种负色散镜进行掺钛蓝宝石激光谐振腔内色散补偿实现了飞秒脉冲锁模,获得了15 fs的超短脉冲。
Two types of negative-dispersion mirrors (NDM1 and NDM2) have been designed based on the requirements of the Ti: sapphire laser. NDM1 introduces both a chirp effect and a G-T effect resulting in a large group delay dispersion to reduce the number of reflections of light on the negative chromatic aberration mirror. NDM2 introduces only a G-T effect resulting in a smaller group delay dispersion to compensate for the partial chirp caused by intracavity self-phase modulation. The two kinds of negative chromatic dispersions were prepared by ion beam sputtering. Their transmissivity was tested with a spectrophotometer. The results show that the performance of the prepared negative-dispersion mirror is very close to the design performance. The use of these two kinds of negative chromatic dispersion mirror for Ti: Sapphire laser cavity dispersion compensation to achieve femtosecond pulse mode locking, obtained 15 fs ultrashort pulse.