Research on passively Q-switched solid-state laser based on graphene and topological insulator

短脉冲具有高空间分辨率、高时间分辨率、宽带宽、高峰值功率的特点，广泛应用于工业加工、激光雷达、非线性光学等领域。被动调Q因其结构简单、成本低廉、方便实用等诸多优点成为获取短脉冲的一种重要方式，而被动调Q的关键技术又在于可饱和吸收材料的选择。在被动调Q技术发展之初的几十年里，传统的可饱和吸收体材料如有机染料、可饱和吸收晶体（色心晶体、Cr:YAG等）受到了广泛的研究，但是它们稳定性差、工作范围窄，已经无法满足日新月异的激光脉冲技术的要求。近年来，半导体可饱和吸收镜（SESAM）、单壁碳纳米管（SWCNT）等新型可饱和吸收材料的出现使被动调Q技术初现曙光，但是人们仍然没有停止寻找性能更优良的可饱和...Short pulses, which have the characteristics of high spatial resolution, high temporal resolution, high bandwidth, high peak power, have been widely used in industry processing, laser radar, nonlinear optics and many other fields. Passive Q-switching has a lot of advantages, such as, simple structure, low cost, convenient and practical and thus to be an important way for short pulses. The key tech...学位：工学硕士院系专业：信息科学与技术学院_光学工程学号：2312012115288