期刊
LASER PHYSICS
卷 27, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1555-6611/27/1/015102
关键词
mode-locked fiber laser; nonlinear optical materials; saturable absorber
资金
- Scientific Researches Foundation of College of Optoelectronic Science and Engineering, National University of Defense Technology [0100070014007]
- Scientific Researches Foundation of National University of Defense Technology [zk16-03-59]
A passively mode-locked thulium/holmium-doped fiber laser (THDFL) based on tungsten disulfide (WS2) saturable absorber (SA) was demonstrated. The WS2 nanosheets were prepared by liquid phase exfoliation method and the SA was fabricated by depositing the few-layer WS2 nanosheets on the surface of a fiber taper. The modulation depth, saturable intensity, and non-saturable loss of this SA were measured to be 8.2%, 0.82 GW cm(-2), and 29.4%, respectively. Based on this SA, a stable mode-locked laser operated at 1.91 mu m was achieved with pulse duration of 825 fs and repetition rate of 15.49 MHz, and signal-to-noise ratio (SNR) of 67 dB. Meanwhile, by increasing the pump power and adjusting the position of polarization controller, harmonic mode-locking operations were obtained. These results showed that the WS2 nanosheet-based SA could be served as a desirable candidate for a short-pulse mode locker at 2 mu m wavelength.
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