高功率窄线宽可调谐单频光纤激光器

High-power narrow linewidth tunable single-frequency fiber laser

摘要:

设计并实现了一种主控振荡器的功率放大器(master oscillator power-amplifier,MOPA)型的波长可调谐高功率单频窄线宽光纤激光器,其中振荡级采用环形腔结构,并利用可调谐光纤FP(Fabry-Perot)滤波器和自感应光纤布拉格光栅(fiber Bragg grating,FBG)滤波器实现单频窄线宽激光输出,放大级采用高功率多模半导体激光器泵浦的双包层增益光纤。以980 nm半导体激光器泵浦的2 m掺铒光纤(erbium-doped fiber,EDF) 作为增益介质,可调谐光纤FP滤波器和2 m未泵浦EDF产生的动态FBG组成窄带滤波装置,4 m铒镱共掺双包层光纤(erbium-ytterbium co-doped double-cladding fiber,EYDF) 作为激光放大级增益介质,实现了波长在1 524.35—1566.10 nm范围的波长可调谐窄线宽单频激光输出,平均线宽12.7 kHz,激光输出功率可达1.16 W,显著提高了可调谐窄线宽激光器的输出功率。

Abstract:

A master oscillator power-amplifier (MOPA) type wavelength tunable high-power single-frequency narrow linewidth fiber laser is designed and implemented,in which the oscillation stage adopts a ring-cavity structure,and the tunable fiber Fabry-Perot (FP) filter and self-induction fiber Bragg grating (FBG) filter are used to realize the output of a single-frequency narrow linewidth laser,and the amplification stage is double-cladding gain fiber pumped by a high-power multi-mode laser diode.The 2 m erbium-doped fiber (EDF) pumped by a 980 nm laser diode is used as the gain medium,the dynamic FBG generated by the tunable fiber FP filter and the 2 m unpumped erbium-doped fiber is used as the narrowband filtering device,the 4 m erbium-ytterbium co-doped double-cladding fiber (EYDF) is used as the laser amplification stage gain medium.The wavelength tunable narrow linewidth single-frequency laser output in the range of 1524.35—1566.10 nm is realized,with an average linewidth of 12.7 kHz and a laser output power of 1.16 W,which significantly improves the output power of the tunable narrow linewidth laser.