摘要
利用啁啾脉冲增益饱和放大特性,搭建了一台基于泵浦分束结构的波长可调谐1μm全保偏光纤超短脉冲激光器。该激光器由超短脉冲激光振荡器和超短脉冲激光放大器组成,控制注入到放大器的啁啾脉冲能量,使放大器处于增益饱和或非饱和状态,从而实现激光中心波长的精确调节。实验中,激光器可产生1030.0~1034.5 nm波长可调谐的超短脉冲激光,光谱带宽大于13.1 nm。在整个波长调谐范围内,放大脉冲激光的信噪比均大于55 dB,时域脉宽为7.1~7.5 ps。此外,得益于全保偏光纤架构,该1μm超短脉冲光源表现出良好的长期稳定性,平均功率的相对抖动低至0.1%。该激光器产生的波长可调谐超短脉冲激光,能够精准匹配Yb∶YAG、Yb∶CaF^(2)、Yb∶Lu_(2)O_(3)等晶体的发射峰,可为后续Yb∶YAG、Yb∶CaF_(2)、Yb∶Lu_(2)O_(3)等大能量超短脉冲固体激光器提供紧凑、便捷、稳定的种子光源。
Objective A wavelength-tunable 1-μm ultrashort-pulse fiber laser can be used not only in laser spectroscopy,optical measurements,biomedicine,and other fields,but also as a seed source in the field of ultrashort-pulse solid-state lasers to accurately match the emission peaks of different gain media.Currently,ultrashort-pulse fiber lasers mainly rely on mode-locking techniques such as nonlinear polarization evolution(NPE),nonlinear amplifying loop mirrors(NALMs),and semiconductor saturable absorption mirrors(SESAMs).Wavelength-tunable 1-μm ultrashort-pulse lasers can be constructed by adding corresponding wavelength-tunable items such as interference items,gratings,and bandpass tunable filters.However,these add complexity and cost to the system.This study utilizes the characteristics of gain saturation amplification related to chirp pulses to realize a wavelength-tunable 1-μm polarization-maintaining(PM)ultrashort-pulse fiber laser based on a pump beam splitting structure.The wavelength-tunable 1-μm ultrashort-pulse fiber laser is relatively simple in structure and has the ability to adjust the central wavelength continuously and accurately,which can match the emission peaks of gain crystals such as Yb∶YAG,Yb∶CaF2,and Yb∶Lu2O3.The proposed laser is expected to provide a more compact,portable,and stable seed light source for ultrashort-pulse solid-state lasers.Methods Based on the pump beam splitting structure,an innovative wavelength-tunable ultrashort-pulse fiber laser is realized using the gain saturation amplification effect of chirp pulses.The laser consists of an ultrashort-pulse fiber oscillator,energy controller,and ultrashort-pulse fiber amplifier,which is driven by a semiconductor laser based on a beam-splitting structure.Controlling the chirp pulse energy injected into the amplifier enables the amplifier to operate in a gain-saturation or non-saturation state,and the central wavelength of the laser can be accurately adjusted.Results and Discussions When the laser diode(LD)power is increased to 3
作者
徐明航
刘昆
赵鸿
张大勇
张利明
龙润泽
Xu Minghang;Liu Kun;Zhao Hong;Zhang Dayong;Zhang Liming;Long Runze(Science and Technology on Solid-State Laser Laboratory,Beijing 100015,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第19期7-12,共6页
Chinese Journal of Lasers
