Short distributed feedback fiber laser with unidirectional output for sensing applications  

作　　者：祁海峰 宋志强 彭纲定 李淑娟 王昌 

机构地区：[1]Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute of Shandong Academy of Sciences [2]School of Electrical Engineering and Telecommunications, The University of New South Wales

出　　处：《Chinese Optics Letters》2013年第4期44-46,共3页中国光学快报（英文版）

基　　金：supported by the Research Award Fund for Outstanding Middle-aged and Young Scientists of Shandong Province,China(No.BS2010DX030);the International Science and Technology Cooperation Program of China(No.2012DFA10730)

摘　　要：A short distributed feedback fiber laser with a nearly unidirectional output is fabricated and tested. The short fiber laser is made of a polarization-dependent phase-shift grating fabricated with a vertically polarized 244-nm ultraviolet （UV） laser. A single π phase-shift is introduced to a 2-cm grating at a specified position by directly moving the phase mask during UV beam scanning. Test results show that the laser has a single polarization longitudinal mode with 2.6-mW pump threshold. The backward-to- forward output power ratio is approximately 30：1. The relative intensity noise is -88 dB/Hz, and the linewidth is approximately 10 kHz at 75-mW 980-nm pumping. The unidirectional output and short dimension of this short fiber laser make it very useful in sensing applications, especially in multiplexed sensing aoolications.A short distributed feedback fiber laser with a nearly unidirectional output is fabricated and tested. The short fiber laser is made of a polarization-dependent phase-shift grating fabricated with a vertically polarized 244-nm ultraviolet （UV） laser. A single π phase-shift is introduced to a 2-cm grating at a specified position by directly moving the phase mask during UV beam scanning. Test results show that the laser has a single polarization longitudinal mode with 2.6-mW pump threshold. The backward-to- forward output power ratio is approximately 30：1. The relative intensity noise is -88 dB/Hz, and the linewidth is approximately 10 kHz at 75-mW 980-nm pumping. The unidirectional output and short dimension of this short fiber laser make it very useful in sensing applications, especially in multiplexed sensing aoolications.

关 键 词：Phase shift Phase shifters POLARIZATION Pumping (laser) 

分 类 号：TN248[电子电信—物理电子学] TN253