双波长自锁模半导体薄片激光器  

Dual-wavelength self-mode-locked semiconductor disk laser

作　　者：沈晓红 曾盈莹 毛琳 朱仁江[1] 王涛 罗海军[1] 佟存柱[2] 汪丽杰[2] 宋晏蓉[3] 张鹏[4] Shen Xiao-Hong;Zeng Ying-Ying;Mao Lin;Zhu Ren-Jiang;Wang Tao;Luo Hai-Jun;Tong Cun-Zhu;Wang Li-Jie;Song Yan-Rong;Zhang Peng(College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;College of Applied Sciences,Beijing University of Technology,Beijing 100124,China;National Center for Applied Mathematics,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆师范大学物理与电子工程学院,重庆401331 [2]中国科学院长春光学精密机械与物理研究所,长春130033 [3]北京工业大学应用数理学院,北京100124 [4]重庆师范大学,重庆国家应用数学中心,重庆401331

出　　处：《物理学报》2022年第20期82-89,共8页Acta Physica Sinica

基　　金：在渝本科高校与中科院所属院所合作项目(批准号:HZ2021007);国家自然科学基金(批准号:61904024,61975003,61790584,62025506);重庆市教委科技计划重大项目(批准号:KJZD-M201900502)资助的课题。

摘　　要：双波长锁模激光器在光通信、泵浦探针实验、非线性频率变换等方面应用广泛.本文报道了一种双波长自锁模半导体薄片激光器.利用增益芯片底部的高反射率分布布拉格反射镜和外部的耦合输出镜构成简单的直线型谐振腔,腔内不需要额外的插入元件,依靠增益介质的克尔效应,结合激光芯片上泵浦光斑形成的软光阑,即可启动锁模过程,实现稳定的自锁模输出.锁模脉冲宽度为4.3 ps,重复频率为1.1 GHz,最大输出功率为323.9 mW.在锁模的基础上,使用简单的刀片作为波长调谐元件,通过改变刀片插入谐振腔的深度,可连续调谐激光波长,并在某一特殊位置,获得稳定等强度的双波长输出.实验中的稳定等强度双波长为951和961 nm,对应的输出功率为32 mW.该双波长对应的差频辐射为3.3 THz,具有较好的应用潜力.Dual-wavelength mode-locked lasers can be widely used in optical communication,pump-probe experiment,nonlinear frequency conversion,etc.In this paper,a dual-wavelength self-mode-locked semiconductor disk laser is reported for the first time,to the best of our knowledge.A simple linear resonator is formed by using a high reflectivity distributed Bragg reflector at the bottom of the gain chip,and an external output mirror;the cavity length is about 135 mm,with no need of additional inserted elements.Based on the Kerr effect of the gain medium and the soft aperture formed by the pump spot on the gain chip,along with the fine adjustment of cavity length and pump intensity,the mode-locking process can be started from the free running and the stable self-mode-locking can be realized.The mode-locked pulse width is 4.3 ps,the repetition rate is 1.1 GHz,and the maximum output power is 323.9 mW,which corresponds to a peak power of 68 W.After the laser is mode locked,a readily available blade,which can introduce a wavelength-dependent loss for different laser modes,resulting in a lager cavity loss for a longer-wavelength mode and a smaller cavity loss for a shorter-wavelength mode,is used as a wavelength tuning element,and is inserted into the cavity in the direction perpendicular to the optical axis of the resonator.By changing the depth of the blade inserted into the cavity,the laser wavelength can be continuously tuned from the initial oscillating wavelength(longer-wavelength)to a shorter wavelength,a stable dual-wavelength output with equal intensity can be obtained at a specific position,and the stable continuous-wave mode-locking can be maintained simultaneously.The steady dual-wavelengths in the experiment are 951 and 961 nm,and the corresponding output power is 32 mW.The above dual-wavelength outputs have good coherence since they are stimulated radiations from the same gain chip.Meanwhile,they have relatively high peak power and strictly meet the coaxial conditions,and these are all advantages for the difference fr

关 键 词：双波长 自锁模 半导体薄片激光器 克尔效应 

分 类 号：TN248.4[电子电信—物理电子学]