基于声光调制模式切换的宽重复频率微秒脉冲光纤放大器  

Wide Repetition Frequency Microsecond Pulsed Fiber Amplifier Based on Acousto-Optic Modulating Mode Switching

作　　者：胡梁 钱勇 李培丽[1] 周军[1,2,3] Hu Liang;Qian Yong;Li Peili;Zhou Jun(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;Nanjing Institute of Advanced Laser Technology,Nanjing 210038,Jiangsu,China;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京先进激光技术研究院,江苏南京210038 [3]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2023年第14期22-28,共7页Chinese Journal of Lasers

基　　金：江苏省科技成果转化专项资金项目(BA2022010)。

摘　　要：设计并实现了重复频率在10 Hz~10 kHz可调的1550 nm微秒矩形脉冲光纤放大器。该光纤放大器采用双级主振荡功率放大(MOPA)全光纤结构,采用声光调制器对信号光进行调制,通过对泵浦驱动和信号光调制的脉冲波形及时序进行优化,实现了峰值功率为30 W、脉冲宽度为10μs~1 ms、重复频率在10 Hz~10 kHz范围可调的微秒矩形脉冲放大激光输出。通过优化信号光脉冲和泵浦脉冲时序有效抑制了光纤放大过程中的放大自发辐射,通过对信号光的脉冲波形进行预整形获得了较好的微秒矩形脉冲输出。Objective A 1.5 μm pulse fiber amplifier in the eye-safe band is one of the prominent areas of research in pulse fiber laser technology.Depending on the pulse width,fiber amplifiers are used on different occasions;nanosecond fiber amplifiers are used in lidar,and microsecond fiber amplifiers are used in special material processing,biomedicine,and other fields.However,compared with nanosecond fiber amplifiers,the study of high-power microsecond pulsed fiber amplifiers is more challenging because of the steepening of the pulse waveform during amplification and the significantly increase in amplified spontaneous emission(ASE) at low repetition frequencies.In this study,a two-stage master oscillator power amplifier(MOPA) all-fiber structure was used to design and realize a 1550 nm microsecond rectangular pulse fiber amplifier with an adjustable repetition frequency of 10 Hz to 10 kHz.Compared with the fiber amplifier mentioned by M.Yu.Koptev and Svitlana Pavlova,the present one reduced the system complexity and cost and realized a wider range of adjustable repetition frequencies.Methods The entire fiber amplifier consists of four parts:signal optical pulse modulation,preamplifier,power amplifier,and pulse signal driving and control(Fig.1).The optical signal pulse is modulated by a continuous seed source using an acousto-optic modulator(AOM).The preamplifier consisted of a double-clad erbium-ytterbium co-doped fiber(Nufern,PM-EYDF-12/130,length of 2.4 m),pump laser diode(pump wavelength is 940 nm,maximum optical power of 10 W),multimode pump beam combiner(MPC),and cladding pump stripper(CPS).The power amplifier included a double-clad erbium ytterbium co-doped fiber(Nufern,PMEYDF-12/130,length 3.8 m),pump laser diode(940 nm,80 W),MPC,and CPS.Both the preamplifier and power amplifier use the pulse-pump mode.The RF driver of the AOM,preamplifier pump driver,and power amplifier pump driver can be accurately synchronized and controlled,and the pulse width can be adjusted.The AOM operation is used to solve the waveform dis

关 键 词：光学器件 光放大器 微秒脉冲 铒-镱共掺光纤 声光调制器 主振荡功率放大器 

分 类 号：TN722[电子电信—电路与系统]