摘要
基于掺Yb^(3+)光纤和掺Yb^(3+)晶体的飞秒激光器输出的飞秒激光脉冲具有较高的脉冲能量和平均功率,被广泛应用于科研和工业生产;但受Yb^(3+)增益介质增益带宽的限制,输出脉冲宽度很难小于300 fs。利用飞秒激光脉冲在多层薄板中的自相位调制效应,分别对基于掺Yb^(3+)光纤和掺Yb^(3+)晶体的飞秒激光器输出的飞秒激光脉冲进行非线性压缩。通过优化非线性压缩装置的各项参数,实现了对低能量、窄脉宽和高能量、宽脉宽脉冲的非线性压缩,分别获得了脉冲能量为64μJ、脉冲宽度为42 fs和脉冲能量为315μJ、脉冲宽度为79 fs的飞秒激光脉冲输出,第一级非线性压缩效率均超过80%,整体压缩效率分别为53%和65%。
Objective In recent years,with significant development in ultrashort pulse laser technology,femtosecond pulse lasers occupy an increasingly critical role in scientific research and industry.The overall tendency of femtosecond lasers is the higher peak power density,which is manifested by increasing pulse energy and reducing pulse duration.Multiple methods have been proposed to obtain femtosecond lasers with a pulse duration of<100 fs and a pulse energy of>10μJ.In addition to Ti∶sapphire femtosecond lasers,which directly output femtosecond laser pulses with a high energy and short pulse duration,the compression of high-energy laser pulse output from Yb^(3+)-doped femtosecond lasers is another pertinent method.Yb^(3+)-doped fiber and solid-state femtosecond lasers output femtosecond laser pulses with higher average power,and therefore,show further application potential.However,owing to the gain bandwidth limitation,it is difficult to obtain laser pulses shorter than 300 fs.However,it is important to obtain femtosecond laser pulses with>100μJ pulse energy and<100 fs pulse duration for many applications.To address this challenge,the nonlinear compression of femtosecond laser pulses is proposed,which improves the peak power density of laser pulses from Yb^(3+)-doped femtosecond lasers.Thus,the proposed method enables further applications in industrial processing among other fields.However,some harmful effects exist which reduce nonlinear compression efficiency,such as conical emission.On the contrary,to increase nonlinear compression efficiency,it is important to suppress the conical emission and avoid nonlinear medium damage.Methods In this study,periodic layered Kerr media(PLKM)nonlinear compression principles are analyzed and experiments are conducted.For the conical emission effect in the nonlinear compression experiments,the harmful effect cause and its influence on nonlinear compression are experimentally studied.The spectrum broadening of pulse output from the Yb^(3+)-doped femtosecond fiber laser is measur
作者
韩岳豪
冯汝毅
刘又铭
邹锦阳
刘博文
胡明列
Han Yuehao;Feng Ruyi;Liu Youming;Zou Jinyang;Liu Bowen;Hu Minglie(Ultrafast Laser Laboratory,School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,300072 Tianjin,China;Georgia Tech Shenzhen Institute,Tianjin University,Shenzhen 518055,Guangdong,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第2期19-27,共9页
Chinese Journal of Lasers
基金
国家重点研发计划(2021YFB3602600)
国家自然科学基金(62227821)。
关键词
激光器
飞秒激光脉冲
自相位调制
非线性压缩
光谱展宽
lasers
femtosecond laser pulse
self-phase modulation
nonlinear compression
spectral broadening
