光学学报, 2020, 40 (7): 0736001, 网络出版: 2020-04-15
基于全保偏光纤利用脉冲同步技术差频产生中红外皮秒激光 下载: 1084次
Difference-Frequency Generation of Mid-Infrared Picosecond Laser by Pulse Synchronization Technology Based on All Polarization-Maintaining Fibers
同步激光器 全保偏 差频产生 中红外激光 synchronization laser all-polarization-maintaining difference-frequency generation mid-infrared laser
摘要
搭建了主-从结构的全光被动同步激光器,将主激光器输出脉冲功率放大后注入从激光器,利用注入脉冲在从激光器中的交叉相位调制效应,实现了1029.9 nm泵浦光与1585.5 nm信号光的脉冲同步。采用声光调制器进行选频并配合级联光纤放大,提高了泵浦光脉冲的峰值功率,并通过优化光纤链路长度有效控制了泵浦光光谱展宽。该双色同步脉冲在PPLN晶体中进行非线性差频处理,当重复频率为100 kHz时,获得了3 dB光谱带宽为0.77 nm、中心波长为2940 nm的线偏振皮秒脉冲,最大单脉冲能量为1.8 μJ,泵浦光转化效率为49.6%。
Abstract
An all-optical passive synchronous laser with master-slave configuration is built, the output power of the master laser pulse is amplified and injected into the slave laser, and the pulse synchronization between 1029.9 nm pump light and 1585.5 nm signal light is realized by using the cross-phase modulation effect of the injected pulse in the slave laser. An acousto-optic modulator used for frequency selection together with a cascade fiber amplifier enhances the peak power of pump pulse. In addition, the optimization of fiber link length effectively controls the spectral width broadening effect of pump pulse. The two-color synchronized pulse is processed via nonlinear difference frequency in PPLN crystal. When the repetition rate is set as 100 kHz, a linearly polarized picosecond pulse is achieved with 3-dB spectral width of 0.77 nm, central wavelength of 2940 nm, the maximum single pulse energy of 1.8 μJ , and pump light conversion efficiency of 49.6%.
胡晓蕾, 甘继伟, 杨占军, 曾静, 贡航, 黄坤, 郝强, 曾和平. 基于全保偏光纤利用脉冲同步技术差频产生中红外皮秒激光[J]. 光学学报, 2020, 40(7): 0736001. Xiaolei Hu, Jiwei Gan, Zhanjun Yang, Jing Zeng, Hang Gong, Kun Huang, Qiang Hao, Heping Zeng. Difference-Frequency Generation of Mid-Infrared Picosecond Laser by Pulse Synchronization Technology Based on All Polarization-Maintaining Fibers[J]. Acta Optica Sinica, 2020, 40(7): 0736001.