基于NALM被动锁模的超短脉冲掺饵光纤激光器

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关键词：光纤激光器；被动锁模；超短脉冲；非线性放大环形镜；掺饵光纤 中图分类号：TN248.4 文献标识码：A DOI：10.37188/CJL.20250101 CSTR：32170.14.CJL.20250101

NALM-based PassivelyMode-lockedUltrashortPulse Erbium-dopedFiberLaser

YE Haiqin，WANG Ji，WANG Guozheng，ZHAO Hui，LIU Shihan，XUE Mingkun，JIA Weiyuan （SchoolofPhysics，Changchun UniversityofScienceand Technology，Changchun13o022，China） * CorrespondingAuthor，E-mail：jiji_w@163.com

Abstract：This paper reports a figure-8 cavity mode-locked erbium-doped fiber laser based on a nonlinear amplifying loop mirror（NALM）.Byutilizing theNALMasan equivalent saturable absorber，mode-locked ultrashort pulse laser output in the 1.55μm band was achieved.At a pump power of 245 mW，the laser achieved self-starting modelocking withanoutput powerof1.58mW，arepetition rate of12.75 MHz，acentral wavelength of1564.62 nm，a 3dB spectral bandwidth of5.O8 nm，and asech2-fited pulse widthof 590fs.When the pump power was increased in equal increments，the spectral widthof the mode-lockedpulses broadened，whilethepulse width shortened.At the maximum pump power of 400mW ，the maximum 3 dB spectral width of 5.92 nm was obtained，corresponding to the minimum sech²-fitted pulse width of 488 fs.

Key Words： fiber laser;passive mode-locking；ultrashort pulse;nonlinear amplifying loop mirror; erbium-doped

1引言

超短脉冲激光具有皮秒至飞秒量级的脉冲持续时间、极高的峰值功率，在工业与科学研究领域均展现出广阔的应用前景。（剩余11630字）