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半导体可饱和吸收镜连续被动锁模端面抽运Nd∶YVO₄激光器

Continuous-Wave Passively Mode-Locked Diode End-Pumped Nd∶YVO₄ Laser with a Semiconductor Saturable Absorber Mirror

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【作者】蔡志强；温午麒；姚建铨；王勇刚；张志刚；丁欣；周建勇；周佳凝；李君；王鹏；

【Author】 CAI Zhi-qiang 1,3,4, WEN Wu-qi 1,3,4, YAO Jian-quan 1,3,4, WANG Yong-gang 2,3, ZHANG Zhi-gang 2,3, DING Xin 1,3,4, ZHOU Jian-yong 1,3,4, ZHOU Jia-ning 1,3,4, LI Jun 1,3,4, WANG Peng 1,3,4 1 Institute of Laser and Opto-Electronics, 2 Ultra Fast Laser Laboratory, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjing 300072, China 3 Key Laboratory of Opto-Electronics Information Science and Technology, Ministry of Education, Tianjin 300072, China 4 Cooperated Institute of Nankai University and Tianjing University, Tianjin 300072, China

【机构】天津大学精仪学院激光与光电子研究所；天津大学精仪学院超快激光实验室；天津大学精仪学院激光与光电子研究所天津300072；教育部光电信息技术科学重点实验室；天津300072；南开大学、天津大学联合研究院；天津300072；

【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。更多还原

【Abstract】 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, a 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.更多还原