920 nm高功率全保偏光纤飞秒激光器(特邀)  

High-power all-polarization-maintaining fiber femtosecond laser at 920 nm(invited)

作　　者：潘民杰 梁兆恒 林巍 修昊 刘亚龙 韦小明 杨中民[1,3,4,5,6] PAN Minjie;LIANG Zhaoheng;LIN Wei;XIU Hao;LIU Yalong;WEI Xiaoming;YANG Zhongmin(School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,China;Guangzhou Yangming Laser Technology Co.,Ltd.,Guangzhou 510663,China;State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China;Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices,South China University of Technology,Guangzhou 510640,China;Guangdong Province Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510640,China;Research Institute of Future Technology,South China Normal University,Guangzhou 510006,China)

机构地区：[1]华南理工大学物理与光电学院,广东广州510640 [2]广州扬名激光技术有限公司,广东广州510663 [3]华南理工大学发光材料与器件国家重点实验室,广东广州510640 [4]华南理工大学广东省特种光纤材料与器件工程技术研究开发中心,广东广州510640 [5]华南理工大学广东省光纤激光材料及应用技术重点实验室,广东广州510640 [6]华南师范大学未来技术研究院,广东广州510006

出　　处：《红外与激光工程》2025年第3期174-183,共10页Infrared and Laser Engineering

基　　金：广东省重点领域研发计划项目(2023B0909010002);广东省“珠江人才计划”引进创新创业团队项目(2021ZT09Z109)。

摘　　要：920 nm飞秒光纤激光器在生物成像、非线性光学和光谱学等领域具有广泛的应用潜力。为了满足日益增长的需求,提升920 nm飞秒光纤激光的平均功率、可靠性、噪声性能成为重要研究方向。针对上述需求,报道了一种可靠的920 nm高功率全保偏光纤飞秒激光器。该激光器的种子源采用全保偏9字腔锁模光纤振荡器,通过级联全保偏光纤啁啾放大,最终获得了基本重复频率为36.66 MHz、脉冲宽度为323 fs、平均功率为1.08 W的飞秒脉冲,实现了920 nm全保偏掺钕光纤激光器的最高平均功率输出。激光器1 h内的功率抖动仅为0.21%(相对标准偏差),10 Hz1MHz偏移频率范围内测得的时间抖动和累积相对强度噪声分别为745 fs和0.098%,表明该920 nm高功率全保偏光纤飞秒激光器具备优异的噪声性能。Objective The 920-nm femtosecond fiber laser is promising in the fields such as biological imaging,nonlinear optics and spectroscopy.With the development of optical fiber technology,the methods for generating 920-nm femtosecond fiber laser can be classified into two types.One is directly lasing at 920 nm using Nd3+-doped fiber,and the other is nonlinearly shifting.The latter method often faces challenges such as system complexity and low conversion efficiency.To this end,it is of great practical significance to study ultrafast lasers based on Nd3+-doped fiber.More importantly,increasing average power and reducing noise are highly demanded for frontier applications.Consequently,there is a strong need to develop a high-power,low-noise 920-nm femtosecond fiber laser.To this end,an all-polarization-maintaining(all-PM)figure-9 mode-locked fiber laser based on a nonlinear amplifying loop mirror with subsequent all-PM amplification is proposed.Methods A 920-nm all-PM mode-locked fiber laser is constructed.The output pulses from both the reflection and transmission ports of the seed laser are characterized(Fig.2).The output pulse from reflection port is chosen as the low-noise seed for subsequent power amplification,which demonstrates superior performance(Fig.3).Chirped pulse amplification(CPA)technology is employed to increase the average power of output pulse,while effectively suppressing parasitic light at 1.06μm.This approach delivers a high-power,high signal-to-noise ratio 920-nm laser with stable performance(Fig.4).The beam quality is good,and after de-chirping,the pulse duration is compressed to the femtosecond scale(Fig.5).Finally,the noise performance of each stage of the laser is experimentally characterized,which indicates a low noise performance(Fig.6).Results and Discussions The mode-locked seed pulses from the reflection and transmission ports of a figure-9 mode-locked laser are characterized.The reflection port exhibits a flatter output spectrum,higher output power,lower timing jitter and integrated relat

关 键 词：9字腔 啁啾脉冲放大 掺钕光纤激光器 低噪声 

分 类 号：O437[机械工程—光学工程]