supported by the State Key Research Development Program of China(2019YFB2203503);the National Natural Science Foundation of China(61435010,61575089,61705140 and 61805146);the Science and Technology Innovation Commission of Shenzhen(JCYJ20180305125141661,JCYJ20180307164612205,and GJHZ20180928160209731);support from the Instrumental Analysis Center of Shenzhen University(Xili Campus)。
Single frequency fiber lasers have attracted intense attention in the high precision measure,optical communication and Raman spectroscopy due to their special features including narrow spectral linewidth,low-intensity...