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�������պ����ѧѧ�� 2008, Vol. 34 Issue (11) :1258-1260    DOI:
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Narrow-linewidth single-frequency single-polarization Er-doped fiber ring laser
Ou Pan, Jia Yudong, Zhang Chunxi, Wei Xingchun*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� In order to acquire a stable narrow-linewidth single-frequency polarized Er-doped fiber laser, the ring fiber laser with a saturable absorber was studied. In the experiments, an un-pumped Er-doped fiber was used as saturable absorber to form an optical narrow-bandwidth filter, a fiber bragg grating with high reflectivity was adopted as coarse wavelength selective component, and a polarization-maintaining optical circulator with high extinction ratio was applied to acquire single polarization laser. The peak wavelength of the Er-doped ring fiber laser can be tuned from 1�K548�Knm to 1�K552�Knm by pulling the fiber bragg grating. The maximum output power was 55.4mW when the pump power arrived at 275mW. The 20dB linewidth of the Er-doped ring fiber laser was measured to be 3kHz with the fiber delayed heterodyne method. It was found that the polarization of the Er-doped ring fiber laser was very stable for a long term, and the degree of polarization was ��99.9%��. This narrow-linewidth single-frequency single-polarization Er-doped fiber laser can be used as stable signal source for coherent laser radar.
Keywords�� lasers   fiber lasers   ring laser   polarization     
Received 2007-11-16;
About author: ŷ ��(1977-),��,���ϳ�����,��ʦ,oupan23@gmail.com.
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ŷ ��, ��ԥ��, �Ŵ���, κ�˴�.խ�߿�Ƶ��ƫ����ǻ������˼�����[J]  �������պ����ѧѧ��, 2008,V34(11): 1258-1260
Ou Pan, Jia Yudong, Zhang Chunxi, Wei Xingchun.Narrow-linewidth single-frequency single-polarization Er-doped fiber ring laser[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(11): 1258-1260
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