报道了一种具有热稳腔设计实现1064 nm 皮秒脉冲激光输出的被动锁模 Nd ∶YVO4激光器。并在此基础上，不改变锁模条件激光模式的同时引入 Herriott 型多程腔来增加腔长，使总腔长达到38.7 m。采用光纤耦合输出的808 nm 激光二极管对 Nd ∶YVO4晶体进行端面抽运，以半导体可饱和吸收镜作为被动锁模元件，获得了重复频率低至3.9 MHz 的皮秒激光脉冲，脉宽为60 ps。在泵浦功率为10 W 时，平均输出功率为2.6 W，对应单脉冲能量0.67μJ，x 和 y 方向的光束质量因子分别为1.01和1.11。%A passively mode-locked Nd ∶YVO4 laser operating at 1064 nm is reported with a thermal-stable resonator design.In addition,through the introduction of a Herriott-type multi-pass cavity (MPC),the cavity length is extended to 38.7 m under the invariability of the mode-locking condition.A fiber-coupled 808 nm laser diode is used to end-pump an Nd ∶YVO4 crystal with a semiconductor saturable absorber mirror (SESAM)as the passive mode-locking component,and picosecond pulse with a low repetition rate of 3.9 MHz and pulse duration of 60 ps are ob-tained.When pump power is 10 W,the average output power is 2.6 W,corresponding to a single pulse energy of 0.67μJ,while the M2 factors in the x and y directions are 1.01 and 1.11,respectively.
展开▼
