摘要
为了实现高效、紧凑、窄线宽的2μm激光输出,采用中心波长为790nm的LD激光器作为泵浦源端面泵浦掺铥光纤,半导体散热系统,光纤布拉格光栅(FBG)构成谐振腔的全光纤激光器。首先,我们采用一个光栅,光纤尾端采用4%的菲涅尔反射,将所有的光学元件熔接在一起后,我们获得了2μm的稳定输出。当泵浦电流为44A时,获得的最大输出功率为8.7W,斜率效率为29.4%,其线宽为4.5m,阈值功率为0.7W。当采用两个光栅构成谐振腔时,其线宽可窄至3nm左右,光斑质量可得到进一步的提高.实验结果表明:该激光器稳定性可靠、输出激光线宽较窄,功率较高,光斑质量好。
In order to achieve efficient,compact,narrow linewidth laser output at 2μm,with center wavelength of 790nm laser as pump source of LD end-pumped Tm-doped fiber,semiconductor cooling system,and resonant cavity which was constituted by fiber Bragg gratings were designed for all-fiber laser.First,we use a FBG,and another optical fiber end with 4% Fresnel reflection,then we welded all the optical components together,we get 2μm the stability of the output.When the pump current is 44A,we access to the maximum output power of 8.7W,with a slope efficiency of 29.4%,and the width of 4.5nm,the threshold power is 0.7W.When the cavity with two gratings,its width can be about as narrow as lnm,spot quality could be further improved.The results show that the stability of laser output is high,linewidth is relatively narrow,the power of output is hiagh,and the quality of the beam is perfect.
出处
《激光杂志》
CAS
CSCD
北大核心
2012年第1期18-19,共2页
Laser Journal
基金
国家"863"计划项目(2007AA03)
