1-, 1.5-, and 2-μm Fiber Lasers Q-Switched by a Broadband Few-Layer MoS2 Saturable Absorber

• DOI: 10.1109/jlt.2014.2362147
• Publication Date: 2014-11-07T20:18:58Z
• Authors: Zhengqian Luo; Yizhong Huang; Min Zhong; Yingyue Li; Jianyu Wu; Bin Xu; Huiying Xu; Zhiping Cai; Jian Peng; Jian Weng
• Keywords: Fiber lasers; Fibers; Infrared devices; Saturable absorbers; Molybdenum compounds; 535; 02 engineering and technology; Ytterbium; 0210 nano-technology; Semiconductor quantum wells; 7. Clean energy; Erbium

We propose and demonstrate 1, 1.5, 2 μm passively Q-switched fiber lasers by exploiting a few-layer Molybdenum sulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) polymer composite as broadband saturable absorber (SA), respectively. The MoS nanosheets are prepared the liquid-phase exfoliation method, composited with polyvinyl alcohol (PVA). PVA-MoS film is sandwiched between two ferrules to form fiber-compatible SA. not only shows good transparency from ultraviolet mid-infrared spectral region, but also possesses nonlinear absorption. modulation depth saturation optical intensity of measured be 1.6% 13 MW/cm <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 1566 nm balanced twin-detector technique, By further inserting filmy SA into cavities Yb-, Er- Tm-doped lasers, we achieve stable Q-switching operations 1.06, 1.56, 2.03 μm, output characteristics pulses three wavelengths have been investigated, -based enables large pulse energy ~1 μJ width 1.76 μs. This is, best our knowledge, first demonstration in wide wavelength range (from 1 μm). Our results experimentally confirm that new-type 2-D material, , promising Q-switch covering all major near- region.