二硫化钨(WS2)因其具有带隙可调谐、载流子迁移率较高和吸收波段较宽等优异的光学特性,在脉冲激光器领域中有着广泛的应用。本文首先采用锂离子-插层法获得了WS2纳米片溶液,通过超声、离心、旋涂、烘干等流程成功制备了性能优异的WS2可饱和吸收体。其次,利用拉曼、AFM等方法对WS2-SA进行了系统地表征分析,结果表明所制备的WS2-SA表面薄膜是少层层状二维结构。最后,将WS2-SA作为全固态绿光脉冲激光器的调Q器件,利用非线性光学晶体PPLN进行倍频,获得了稳定的被动调Q绿光脉冲激光输出。当吸收泵浦功率为666 W时,最大的平均输出功率为4075 mW,输出脉冲宽度为360 ns,重复频率为116 MHz。

Tungsten disulfide (WS2) is widely used in pulsed lasers due to its excellent optical properties such as tunable band gap, high carrier mobility and wide absorption band. In this paper, the lithium ion-interlayer method was firstly used to obtain WS2 nanoplate solution. WS2 saturable absorber with excellent performance is successfully prepared through ultrasonic, centrifugal, rotary coating, drying and other processes. Secondly, Raman, AFM and other methods are used to systematically characterize and analyze WS2-SA, and the results show that the prepared WS2-SA surface film is a two-dimensional structure with few layers. Finally,WS2-SA is used as the Q-switching device of all solid-state green pulse laser, and the frequency multiplier is carried out by using nonlinear optical PPLN crystal to obtain the stable passive Q-switched pulse laser output. When the absorption pump power is 666 W, the maximum average output power is 4075 mW, the pulse width is 360 ns, and the repetition frequency is 116 MHz.