Wideband tunable passively Q-switched fiber laser at 2.8 μm using a broadband carbon nanotube saturable absorber  

作　　者：YANJIA Lü CHEN WEI HAN ZHANG ZHE KANG GUANSHI QIN YONG LIU 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China [2]College of Electrical Engineering and Information Technology, Sichuan University [3]Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences [4]State Key Laboratory on Integrated Optoelectronics, College of Electronic Science & Engineering, Jilin University

出　　处：《Photonics Research》2019年第1期14-18,共5页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(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)

摘　　要：We propose and demonstrate a widely tunable passively Q-switched Ho^(3+)∕Pr^(3+)-codoped ZrF_4-BaF_2-LaF_3-AlF_3-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∕cm^2, 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-nanotubeenabled passively Q-switched fiber laser operating in the 2.8 μm MIR waveband.We propose and demonstrate a widely tunable passively Q-switched Ho^(3+)∕Pr^(3+)-codoped ZrF_4-BaF_2-LaF_3-AlF_3-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∕cm^2, 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-nanotubeenabled passively Q-switched fiber laser operating in the 2.8 μm MIR waveband.

关 键 词：BROADBAND carbon EXCELLENT SWCNTS pulse HO^3+ SAs pump 

分 类 号：TN248[电子电信—物理电子学]