全光纤结构的2.8μm增益开关激光器  

All-fiber gain-switched laser at 2.8μm

作　　者：陈汉波 王涛[1] 郭春雨[1] 阮双琛[1,2] CHEN Hanbo;WANG Tao;GUO Chunyu;RUAN Shuangchen(College of Physics and Optoelectronic Engineering,State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518060,Guangdong Province,P.R.China;Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes,Shenzhen Technology University,Shenzhen 518118,Guangdong Province,P.R.China)

机构地区：[1]深圳大学物理与光电工程学院,射频异质异构集成全国重点实验室,广东深圳518060 [2]深圳技术大学先进光学精密制造技术广东省普通高校重点实验室,广东深圳518118

出　　处：《深圳大学学报（理工版）》2024年第5期524-531,共8页Journal of Shenzhen University(Science and Engineering)

基　　金：国家重点研发计划资助项目(2022YFB3605800);国家自然科学基金资助项目(61975136,61935014)。

摘　　要：波长为2.8μm的中红外脉冲激光器在科研及生物医疗领域具有重要应用.自主研制基于增益开关的976 nm高功率脉冲激光器,并以此为泵浦源,两端刻有光纤光栅的Er^(3+):ZBLAN(ZrF_(4)-BaF_(2)-LaF_(3)-AlF_(3)-NaF)光纤线型腔作为振荡器,通过级联增益开关的方式,实现了全光纤结构的2.8μm增益开关激光器.输出脉冲的重复频率为50 kHz,脉宽为1.27μs,最大输出功率为175.2 mW,相应的脉冲能量为3.54μJ.由于采用增益开关和光放大方案制备的976 nm泵浦源输出稳定性较高,与采用传统电调制泵浦源方案相比,利用本研究泵浦源方案实现的2.8μm增益开关激光器具有更高的输出脉冲稳定性.该工作从提升输出特性方面拓展了2.8μm全光纤增益开关激光器的研究,并为其他波段增益开关激光器在提高输出脉冲稳定性方面提供了有益借鉴方案.The mid-infrared pulsed lasers at 2.8μm are widely used in scientific and biomedical fields.By cascading gain-switches,a 2.8μm all-fiber gain-switched laser was achieved.The pump and oscillator are respectively a homemade 976 nm high power pulsed laser based on gain-switched and a Er^(3+)∶ZBLAN(ZrF_(4)-BaF_(2)-LaF_(3)-AlF_(3)-NaF)fiber linear cavity with a pair of fiber Bragg gratings at both ends.The repetition frequency of the output pulses is 50 kHz,and the pulse width is 1.27μs.The maximum output power is 175.2 mW,corresponding to pulse energy of 3.54μJ.Owing to the high output stability of the 976 nm pump source based on gain-switched and optical amplifier,the 2.8μm gain-switched laser is able to obtain more stable pulses than those achieved by the traditional pump source.This work not only enriches the researches on 2.8μm all-fiber gain-switched lasers in terms of improving output characteristics,but also provides a scheme for gain-switched lasers at other bands to obtain more stable pulses.

关 键 词：光电子与激光技术 增益开关 中红外激光 脉冲光纤激光器 2.8μm激光器 全光纤化 

分 类 号：TN248[电子电信—物理电子学] O437[机械工程—光学工程]