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�������պ����ѧѧ�� 2008, Vol. 34 Issue (05) :568-571    DOI:
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Short fibre delayed self-heterodyne interferometer for ultranarrow laser linewidth measurement
Jia Yudong, Ou Pan, Yang Yuanhong, Zhang Chunxi*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Ultranarrow laser linewidth measurement using an shorter delay fibre to realize delayed self-heterodyne interferometer was described. The fundamental using delayed self-heterodyne to measure laser linewidth was analyzed, and the emulator was programmed based on the mathematical module. An experimental setup was constructed to measure subkilohertz laser linewidths, the experimental results agree well with the emulational result. On the basis analysis, the method of short fibre delayed self-heterodyne were presented and analyzed. By using the method, the measure error can be decreased greatly when the length of delay fibre shorter than six times laser-s coherence length. It is proved that method is an effective tool for measuring an ultranarrow laser linewidth, and it can reduce the length of fibre.
Keywords�� ultrannarrow laser   linewidth measurement   short fibre delayed self-heterodyne     
Received 2007-04-27;
About author: ��ԥ��(1975��),��,����������,��ʿ��,jyd_blueeye@126.com.
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��ԥ��, ŷ��, ��Զ��, �Ŵ���.�̹�����ʱ��������խ�߿������߿�[J]  �������պ����ѧѧ��, 2008,V34(05): 568-571
Jia Yudong, Ou Pan, Yang Yuanhong, Zhang Chunxi.Short fibre delayed self-heterodyne interferometer for ultranarrow laser linewidth measurement[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(05): 568-571
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