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http://dx.doi.org/10.3807/JOSK.2016.20.6.716

High Power Switchable Dual-Wavelength Linear Polarized Yb-Dozped Fiber Laser around 1120 nm  

Liu, Xiaojuan (School of Science, Shandong University of Technology)
Huang, Bangcai (China Electronics Technology Group Corporation, 46th Research Institute)
Wei, Gongxiang (School of Science, Shandong University of Technology)
Han, Kezhen (School of Science, Shandong University of Technology)
Huang, Yan (School of Science, Shandong University of Technology)
Liu, Fangfang (School of Science, Shandong University of Technology)
Publication Information
Journal of the Optical Society of Korea / v.20, no.6, 2016 , pp. 716-721 More about this Journal
Abstract
A single-and dual-wavelength switchable polarized Yb-doped double-clad fiber laser around 1120 nm based on a pair of fiber Bragg gratings (FBGs) is demonstrated. The polarization-maintaining (PM) linear cavity is composed of a double clad PM Yb-doped fiber (YDF) and a pair of PM FBGs. The laser can operate in stable dual-wavelength or wavelength-switching modes due to the polarization hole burning (PHB) and the spatial hole burning (SHB) enhanced by the PM linear cavity. In dual-wavelength operation, the two orthogonally polarized wavelengths are centered at 1118.912 nm and 1119.152 nm, with an interval of 0.24 nm and a signal to noise ratio (SNR) of 35 dB. The maximum output power is 14.67 W when the launched LD pump is 24 W corresponding to an optical efficiency of 61.1%. The lasing lines switchover may be realized by adjusting the polarization controller (PC) fitted in the cavity. The two single-wavelengths are 1118.912 nm and 1119.152 nm. When the injected LD pump is 24 W, the highest output powers are 7.68 W and 8.64 W corresponding to optical efficiencies of 32% and 36% respectively. The spectral linewidth of the lasing lines are 0.075 nm and 0.07 nm, and the average numerical values of PER aredB and 19.9 dB, respectively.
Keywords
Dual-wavelength fiber lasers; Ytterbium doped fiber lasers; Polarization maintaining; Fiber Bragg gratings (FBGs);
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