,1.5-MHz repetition rate passively Q-switched Nd∶YVO4 laser based on WS2 saturable absorber

• 作 者: Xi Wang Lu Li Jin-Ping Li Yong-Gang Wang
• 机 构: State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mech
• 出 处: 中国物理B（英文版）
• 发表日期: 2017年4期
• 关键词: Q-switched lasers solid-state lasers nonlinear optical materials

A transmission-type tungsten disulfide (WS2)-based saturable absorber (SA) is fabricated and applied to passively Q-switched Nd∶YVO4 laser.The WS2 nanosheets are deposited on a quartz substrate by the vertical evaporation method.By inserting the WS2 SA into the piano-concave laser cavity,we achieve 153-ns pulses with an average output power of 1.19 W at 1064 nm.To the best of our knowledge,both of them are the best results among those obtained by the Q-switched solid-state lasers with WS2-based absorbers.The repetition rate ranges from 1.176 MHz to 1.578 MHz.As far as we know,it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.