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�������պ����ѧѧ�� 2008, Vol. 34 Issue (03) :357-360    DOI:
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Optical narrowband filter and its application to fiber lasers
Zhang Chunxi, Liu Dianjun, Ou Pan*
Dept. of Civil Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Single-mode fiber laser is a very important light sources for optical sensing and optical communication. The coupled mode function of basing on saturable absorber optical narrow-band filter using numerical analysis was soluted. The factors who effected optical narrow-band filter output response properties, for example the length of Erbium-doped-fiber,the absorption coefficient of Erbium-doped-fiber and the pump wave power was analysed. The length of Erbium-doped-fiber composing saturable absorber inversing with the response bandwidth of filter was verificated experimentally. The optical narrow-band filter to fiber laser was applied, then narrow-band single-longitudinal-mode laser output was got, and the linewidth of laser output is about hundreds of Hertz magnitude. The power of output laser is more than 1mW and the lasing time of no mode-hopping is more than 2 hours. The power instability of the fiber laser is less than 0.028��7%.
Keywords�� optical narrowband filter   saturable absorber   fiber laser   linewidth narrowing.     
Received 2007-06-29;
Fund:

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About author: �Ŵ���(1965-),��,����������,����,zhang-chunxi@163.com.
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�Ŵ���,�����,ŷ��.��խ���˲��������ڹ��˼������е�Ӧ��[J]  �������պ����ѧѧ��, 2008,V34(03): 357-360
Zhang Chunxi, Liu Dianjun, Ou Pan.Optical narrowband filter and its application to fiber lasers[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(03): 357-360
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I03/357
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