Noise-like pulse generation in an ytterbium-doped fiber laser using tungsten disulphide

作者：Zhang, Wenping; Song, Yanrong^*; Guoyu, Heyang; Xu, Runqin; Dong, Zikai; Li, Kexuan; Tian, Jinrong^*; Gong, Shuang

来源：Optical Engineering, 2017, 56(12): 126101.

DOI：10.1117/1.OE.56.12.126101

• fiber laser
• noise-like pulse
• tungsten disulphide
• mode locking

We demonstrated the noise-like pulse (NLP) generation in an ytterbium-doped fiber (YDF) laser with tungsten disulphide (WS2). Stable fundamental mode locking and second-order harmonic mode locking were observed. The saturable absorber (SA) was a WS2-polyvinyl alcohol film. The modulation depth of the WS2 film was 2.4%, and the saturable optical intensity was 155 MW cm(-2). Based on this SA, the fundamental NLP with a pulse width of 20 ns and repetition rate of 7 MHz were observed. The autocorrelation trace of output pulses had a coherent spike, which came from NLP. The average pulse width of the spike was 550 fs on the top of a broad pedestal. The second-order harmonic NLP had a spectral bandwidth of 1.3 nm and pulse width of 10 ns. With the pump power of 400 mW, the maximum output power was 22.2 mW. To the best of our knowledge, this is the first time a noise-like mode locking in an YDF laser based on WS2-SA in an all normal dispersion regime was obtained.

• 出版日期2017-12
• 单位中国人民武装警察部队学院; 北京工业大学