半导体可饱和吸收镜连续被动锁模端面抽运Nd∶YVO_4激光器  

Continuous-Wave Passively Mode-Locked Diode End-Pumped Nd∶YVO_4 Laser with a Semiconductor Saturable Absorber Mirror

作　　者：蔡志强[1] 温午麒[1] 姚建铨[1] 王勇刚[2] 张志刚[2] 丁欣[1] 周建勇[1] 周佳凝[1] 李君[1] 王鹏[1] 

机构地区：[1]天津大学精仪学院激光与光电子研究所 [2]天津大学精仪学院超快激光实验室

出　　处：《中国激光》2005年第6期734-738,共5页Chinese Journal of Lasers

基　　金：国家863计划(2002AA311190);国家自然科学基金(69988003;60278001);教育部南开大学;天津大学联合研究院基金资助项目。

摘　　要：报道了利用国产半导体可饱和吸收镜(SESAM)实现端面抽运Nd∶YVO4激光器连续锁模(CWML)运转的实验结果。在V型腔结构的实验中观察到调Q锁模(QML)波形不稳并有较强的直流成份,通过选择小透过率输出镜和增加腔长,解决了这两个问题。在腔长从0.66m增至1.27m和1.86m过程中,直流分量从52%降到13.6%,0.3%,最终获得了重复频率约80MHz的稳定连续锁模脉冲输出,光谱宽度为0.15nm。在考虑晶体热效应基础上,利用ABCD矩阵方法设计了四镜Z型腔,获得了1W左右的连续锁模输出,重复频率约150MHz。分析和比较了V型腔和Z型腔的优缺点。A diode end-pumped passively mode-locked Nd:YVO4 picosecond laser with home made semiconductor saturable absorber mirror (SESAM) is presented. By choosing a low-transmission output coupler and extending the cavity length, the Q-switching mode-locked pulses are suppressed and the proportion of direct current is decreased in V shaped resonator. When the cavity length is increased from 0.66 m to 1.27 m and 1.86 m, the proportion of direct current is decreased from 52% to 13.6% and 0.3%. At last, the stable continuous mode-locked pulses are attained and the pulse repetition rate is 80 MHz. The spectral width is measured to be 0.15 nm. Considering the thermal effect of the crystal, a four-mirror Z-cavity is designed using the matrix method. Average output power of 1 W at a pulse repetition rate of 150 MHz is obtained. The benefit and disadvantage of the V-shaped cavity and the four-mirror Z-cavity are compared and analyzed.

关 键 词：激光技术 ND:YVO4激光器 半导体可饱和吸收镜 连续锁模 端面抽运 

分 类 号：TN248.1[电子电信—物理电子学]