Wideband tunable passively Q-switched fiber laser at 2.8 μm using a broadband carbon nanotube saturable absorber
We propose and demonstrate a widely tunable passively Q-switched Ho3+/Pr3+-codoped ZrF4-BaF2-LaF3-AlF3-NaF fiber laser operating in the 2.8 μm mid-infrared (MIR) waveband based on a single-walled carbon nanotube (SWCNT) saturable absorber (SA). The SWCNTs have diameters ranging from 1.4 to 1.7 nm. The modulation depth and saturation intensity of the SWCNT SA measured at 2850 nm are 16.5% and 1.66 MW/cm2, respectively. Stable Q-switched pulses with the shortest pulse duration of 1.46 μs and the maximum pulse energy of 0.43 μJ are achieved at a launched pump power of 445.6 mW. The combined use of a broadband SWCNT SA and a plane ruled grating ensures a broad continuously tuning range of 55.0 nm from 2837.6 to 2892.6 nm. The output powers, emission spectra, repetition rates, and pulse durations at different tuning wavelengths are also characterized and analyzed. Our results indicate that SWCNTs can be excellent broadband SAs in the 3 μm MIR region. To the author’s knowledge, this is the first demonstration of a widely tunable carbon-nanotube-enabled passively Q-switched fiber laser operating in the 2.8 μm MIR waveband.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61875033, 61505024, 61435003, 61421002, 61705147, 61605219, 61775031); Chengdu Science and Technology Huimin Project (2016-HM01-00265-SF, 2016-HM01-00269-SF); Fundamental Research Funds for the Central Universities (YJ201723).
Chen Wei：State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, Chinae-mail: firstname.lastname@example.org
Han Zhang：College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
Zhe Kang：Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130012, Chinae-mail: email@example.com
Guanshi Qin：State Key Laboratory on Integrated Optoelectronics, College of Electronic Science & Engineering, Jilin University, Changchun 130012, China
Yong Liu：State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
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Yanjia Lü, Chen Wei, Han Zhang, Zhe Kang, Guanshi Qin, and Yong Liu, "Wideband tunable passively Q-switched fiber laser at 2.8 μm using a broadband carbon nanotube saturable absorber," Photonics Research 7(1), 14-18 (2019)