单频窄线宽窄脉宽高重复频率光纤激光器  

Fiber Laser with Single Frequency,Narrow Line Width,Narrow Pulse Width,and High Repetition Frequency

作　　者：占浩 张鑫[2] 孟俊清 张大伟[1] 钟朝阳[2] 侯霞 陈卫标[4] Zhan Hao;Zhang Xin;Meng Junqing;Zhang Dawei;Zhong Chaoyang;Hou Xia;Chen Weibiao(School of OpticalElectrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Space Laser Engineering Department,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Key Laboratory of All SolidState Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]中国科学院上海光学精密机械研究所航天激光工程部,上海201800 [3]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [4]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800

出　　处：《中国激光》2023年第23期89-96,共8页Chinese Journal of Lasers

基　　金：中国科学院青年创新促进会人才项目(2021243)。

摘　　要：报道了基于保偏光纤结构的窄线宽窄脉宽高重复频率光纤激光器。采用主振荡器功率放大器(MOPA),主放大级采用芯径为40μm的光子晶体光纤(PCF),获得了重复频率为10 kHz、脉宽为1.34 ns、光谱宽度为0.05 nm、脉冲能量为298μJ的稳定激光输出。通过腔外倍频的方式,使用长度为40 mm的温度匹配型三硼酸锂(LBO)晶体,获得了能量为155.5μJ的532 nm激光输出,倍频效率为52%,横向和纵向光束质量分别为M_(x)^(2)=1.28和M_(y)^(2)=1.26。该激光器可应用于基于单光子探测技术的空间激光探测雷达。Objective With the development of singlephoton detection technology,human exploration of Earth and space has enhanced the study of Earth s surface changes,such as those in ice,terrain,and vegetation,and improved the understanding of the impact of glaciers on sea level change.These detections have led to new requirements for the light source of LiDAR technology,including lasers with high repetition rates,narrow pulse widths,and narrow linewidths for improved detection distance and accuracy,enabling better observations of changes in surface characteristics.Lasers with allfiber structures are more compact and stable,which have higher photoelectric conversion efficiency and longer lifespan.The optical fiber structure is more conducive to the multibeam ground detection.This is because a certain detection blind zone between the beams exists,and the detection of multiple beams reduces the distance interval between the beams,resulting in a certain degree of gridded highprecision detection.Allfiber lasers are expected to enable thousandbeam laser ground detection and direct ground measurement.Methods In this study,a continuous seed light of 62.6 mW is used,which is modulated into pulsed light by an electrooptical modulator through a rectangular pulse signal from a signal generator.First,the pulsed seed light is amplified by a gain optical fiber to obtain pulsed light with a wavelength of 1064.43 nm,a linewidth of 0.037 nm,and a peak power of approximately 9.33 W.Then,through a gain fiber for twostage twopass amplification,the pulsed light with a linewidth of 0.037 nm and a peak power of approximately 383.5 W is obtained.After the first twostage amplification,an acoustooptic modulator(AOM)is connected to filter out the continuous wave components of the front stage and improve the contrast of the pulsed light.The thirdstage amplification is done through a PLMAYDF15/130 doubleclad gain fiber to obtain pulsed light with a linewidth of 0.046 nm and a peak power of 7.11 kW.The main amplification stage uses the PLMAYDF25/250 and

关 键 词：激光器 光纤激光器 窄线宽 脉冲激光 高峰值功率 自相位调制 

分 类 号：TN248.1[电子电信—物理电子学]