In order to research the applied advantages of composite crystals to the passively Q-switched lasers,a compact diode-end-pumped passively Q-switched laser was built up with a Yb:YAG/Cr4+:YAG/YAG composite crystal for generating efficient 1 030 nm and 515 nm pulsed lasers.The effects of pump power and initial transmission T0on the laser properties were studied.As a result,a 1 030 nm laser with an average power of 1.97 W is obtained at T0of 95% with slope efficiency of 33%,and the pulse peak power reaches to 87 kW at T0of 85% with pulse width of 3.14 ns.In addition,in the frequency-doubled experiment with LBO,a green laser with higher output power of 634 mW is obtained at T0of 90% with slope efficiency of 11.2% and pulse width of 15 ns.Finally,the red shift of spectrum and the leakage of output mirror were studied,as well as the method for increasing output power of green laser.%为了研究键合晶体在被动调Q激光器上的应用优势,采用Yb:YAG/Cr4+:YAG/YAG键合晶体搭建了紧凑的端面泵浦被动调Q激光器,获得了高效的1030 nm和515 nm脉冲激光.实验研究了泵浦功率和初始透过率 T0对各项激光性能的影响,结果在 T0=95% 时得到了平均功率为1.97 W的1030 nm激光,对应33% 的斜效率,而当 T0=85%时输出的1030 nm脉冲峰值功率高达87 kW,脉冲宽度低至3.14 ns.另外在与LBO的倍频实验中,用 T0=90% 的键合晶体获得了较高的绿光输出功率634 mW,对应11.2% 的斜效率和15 ns的脉冲宽度.最后还研究了光谱的红移和输出镜的漏光现象,找出进一步提高绿光功率的方法.
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