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.
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
Okoshi T,Kikuchi K, Nakayama A. Novel method for high resolution measurement of laser output spectrum[J].Electron Lett, 1980, 26: 630-631
Richter L E, Mandelberg H I, Kruger M S, et al. Linewidth determination from self-heterodyne measurements with subcoherence delay times [J].IEEE Journal of Quantum Electronics.1986,22(11):2070-2074
��عӢ,������. ���̽��ԭ�� [M] ����:�������ӿƼ���ѧ������, 2004:152-153 An Yuying, Zeng Xiaodong [M]. Xi’an: Publishing House of Xi’an Electronic Science and Ttechnology University, 2004:152-153 (in Chinese)
�ս���,������,������. MATLAB������ѧ[M]. ����:���ӹ�ҵ������, 2005:477-480 Su Jinming, Ruan Shenyong, Wang Yongli. MATLAB engineering maths[M]. Beijing: Publishing House of Electronics Industry, 2005:477-480(in Chinese)
Namkyoo Park, Dawson Jay W, Vahala Kerry J. Linewidth and frequency jitter measurement of an erbium-doped fiber ring laser by using a loss-compensated delayed self-heterodyne interferometer [J].IEEE Photonics Technology Letters.1992, 4(9):1063-1066
Chen Xiaopei, Han Ming, Zhu Yizheng, et al. Implementation of a loss-compensated recirculating delayed self-heterodyne interferometer for ultranarrow laser linewidth measurement [J].Applied Optics.2006, 45(29):7712-7717