面向Li原子D1线频率测量应用的掺铒飞秒光纤光梳系统

报道了自主研制的面向Li原子D1线频率测量应用的掺铒飞秒光纤光学频率梳,包括飞秒激光源, 频率探测及控制单元, 光谱展宽及拍频单元.光纤光梳系统中飞秒激光光源是一套基于非线性偏振旋转锁模机制的掺铒飞秒光纤激光器, 重复频率为196.5 MHz, 中心波长为1 572 nm.利用f-2f法探测载波包络相移频率, 获得信噪比约为40 dB的信号(分辨率带宽300 kHz).改变飞秒激光光源泵浦控制载波包络相移频率、频率稳定度是3.74×10-18/τ1/2; 通过电光晶体和压电陶瓷改变飞秒激光光源腔长来控制重复频率frep、频率稳定度是1.75×10-13/τ1/2.利用高非线性光纤和倍频晶体将光纤光梳直接输出光谱由1 520~1 607 nm扩展到671 nm, 获得了单模功率为208 nW的光信号.与671 nm单频激光拍频产生约为60 dB(分辨率带宽1 Hz)信号, 满足Li原子D1线频率测量实验的需求.

Abstract

A home-made Er: fiber optical frequency comb aimed at measurement of frequency of D1 line in Li atoms was demonstrated.The system includes Femtosecond laser, frep and fceo detection and control, Spectral broaden and Beat unit. Femtosecond laser is a home-made nonlinear-polarization-rotation mode-locked laser, oscillating at around 1 572 nm with a repetition rate of 196.5 MHz. The fceo detection is accomplished by using the f-2f beating method, the signal-to-noise ratio of fceo about 40 dB with 300 kHz. fceo controlled by changing the pump current and its in-loop frequency instability, evaluated by the Allan deviation, is approximately 3.74×10-18/τ1/2;frep controlled by changing the cavity length of femtosecond laser, its in-loop frequency instability is approximately 1.75×10-13/τ1/2. Optical spectrum is broadened and multipliered from infrared 1 520-1 607 nm to 671 nm by using highly nonlinear fiber and MgO: Periodically poled lithium niobate. Finally, obtaining the beat signal between sigle-frequency laser and optical comb about 60 dB with 1 Hz.

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饶冰洁, 张颜艳, 闫露露, 武跃龙, 张攀, 樊松涛, 郭文阁, 张晓斐, 张首刚, 姜海峰. 面向Li原子D1线频率测量应用的掺铒飞秒光纤光梳系统[J]. 光子学报, 2019, 48(1): 0114003. RAO Bing-jie, ZHANG Yan-yan, YAN Lu-lu, WU Yue-long, ZHANG Pan, FAN Song-tao, GUO Wen-ge, ZHANG Xiao-fei, ZHANG Shou-gang, JIANG Hai-feng. Er: fiber Femtosecond Optical Frequency Comb Aimed at Measurement of Frequency of D1 Line in Li Atoms[J]. ACTA PHOTONICA SINICA, 2019, 48(1): 0114003.

面向Li原子D1线频率测量应用的掺铒飞秒光纤光梳系统

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