1645 nm单纵模NPRO激光器短期频率稳定度的测量  

Short-term frequency stability measurement of 1645 nm single longitudinal-mode NPRO laser

作　　者：崔春旺 纳全鑫 张艺轩[1] 王雨佳[1] 高明伟[1] 王庆[1] 高春清[1] CUI Chun-wang NA Quan-xin ZHANG Yi-xuan WANG Yu-jia GAO Ming-wei WANG Qing GAO Chun-qing(School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]北京理工大学光电学院,北京100081

出　　处：《激光与红外》2017年第6期693-697,共5页Laser & Infrared

基　　金：国家自然科学基金项目(No.61378021;No.61627821)资助

摘　　要：利用光纤延时自外差法对单块非平面Er∶YAG环形振荡器(NPRO)输出单纵模激光的短期频率稳定度进行了测量。激光器输出波长为1645 nm。测量了延时时间分别为0.25μs,0.75μs,1.25μs,1.75μs,2.25μs,2.75μs,5.25μs,7.25μs,9.75μs,108.5μs,166μs的输出激光的自外差拍频信号。设置频谱仪的span为20 k Hz,扫描时间为10 s,Res BW为51 Hz,VBW为1 Hz,测量拍频信号的3 d B带宽。在延时时间0.25~9.75μs范围内,通过线性拟合在不同延时下的3 d B带宽,得到单纵模NPRO激光器的短期频率稳定度为201 Hz/μs。光纤延时长度为21.7 km和33.2 km时,测量的3 d B带宽约为14 k Hz。Using the fiber delayed self-heterodyne method, the short-term frequency stability of the monolithic nonpla- nar Er ： YAG ring oscillator（NPRO） outputting the single longitudinal-mode was measured. The laser output wave- length is 1645nm. The self-heterodyne beat signal of the laser was achieved under different delay time about 0.25 μs, 0. 75 μs, 1.25 μs, 1.75 μs,2. 25 μs,2. 75 μs,5.25 μs,7.25 μs,9. 75 μs, 108.5 μs, 166 μs. When span of the spectrum analyzer is 20 kHz,sweep time is 10 s,Res BW is 51 Hz and VBW is 1Hz,the 3 dB bandwidth of the beat signal was measured. In the delay time range of 0. 25 - 9. 75 μs, through linear fitting of the 3 dB bandwidth under different delay time,the short-term frequency stability of the single longitudinal-mode NPRO laser is 201 Hz/μs. In addition,the 3 dB bandwidth of about 14 kHz was obtained when the lengths of the delay time fiber are about 21.7 km and 33.2 km.

关 键 词：NPRO激光器 单纵模 光纤延时自外差 频率稳定度 

分 类 号：TN248[电子电信—物理电子学]