基于微纳光纤-单壁碳纳米管可饱和吸收体的被动调Q掺镱光纤激光器

摘要

为实现具有高脉冲能量的调Q脉冲激光输出,利用微纳光纤-单壁碳纳米管复合的方法制备可饱和吸收体,并对基于该类型可饱和吸收体器件的被动调Q掺镱光纤激光器进行研究.采用拉伸法将普通单模石英光纤拉制成微纳光纤,将其与单壁碳纳米管溶液复合,进一步制备成全光纤集成型器件.将该器件置于环形腔掺镱光纤激光器中,利用976 nm半导体激光器作为抽运源.当抽运功率为53 mW时,实现了调Q脉冲激光输出,激光中心波长为1 039 nm.进一步提升抽运功率至76 mW,可获得脉冲宽度为3.1 μs、重复频率为25.5 kHz、单脉冲能量为941 nJ的调Q脉冲激光输出.研究表明,利用微纳光纤制备的可饱和吸收体器件具有较高的损伤阈值,可用于实现高脉冲能量的激光输出.%In order to realize Q-switched fiber laser with high energy pulse,passively Q-switched Yb3 +-doped fiber laser based on the microfiber-single wall carbon nanotube (SWCNT) saturable absorber (SA) was reported.The microfiber was fabricated by drawing the single mode silica fiber and then composite with the SWCNT solution,further on preparation of all fiber integrated devices.By inserting the SA in a Yb3+-doped fiber laser ring cavity pumped by a 976 nm laser diode,stable passively Q-switched pulse train occurs at 53 mW incident pump power.Increasing the pump power to 76 mW,3.1 μs pulses at 1 039 nm with a repetition rate of 25.5 kHz are obtained,which corresponds to single pulse energy of 941 nJ.This result shows that the microfiber based SA can enhance the threshold of material damage and obtain high energy pulse laser.