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题名: Study on Frequency Coherence Properties of Light Beams
作者: Zhu NH;  Li W;  Wang LX;  Chen SF;  Ke JH;  Zhang YL;  Wen JM;  Liu Y;  Wang X;  Yan HQ;  Xie L
发表日期: 2009
摘要: This paper presents a new concept of frequency coherence in the frequency-time domain to describe the field correlations between two lightwaves with different frequencies. The coherence properties of the modulated beams from lightwave sources with different spectral widths and the modes of Fabry-Wrot (FP) laser are investigated. It is shown that the lightwave and its corresponding sidebands produced by the optical intensity modulation are perfectly coherent. The measured linewidth of the beat signal is narrow and almost identical no matter how wide the spectral width of the beam is. The frequency spacing of the adjacent FP modes is beyond the operation frequency range of the measurement instruments. In our experiment, optical heterodyne technique is used to investigate the frequency coherence of the modes of FP laser by means of the frequency shift induced by the optical intensity modulation. Experiments show that the FP modes are partially coherent and the mode spacing is relatively fixed even when the wavelength changes with ambient temperature, bias current and other factors. Therefore, it is possible to generate stable and narrow-linewidth signals at frequencies corresponding to several mode intervals of the laser.
KOS主题词: coherence;  intensity modulation;  line width
刊名: IEEE JOURNAL OF QUANTUM ELECTRONICS
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Zhu NH ; Li W ; Wang LX ; Chen SF ; Ke JH ; Zhang YL ; Wen JM ; Liu Y ; Wang X ; Yan HQ ; Xie L .Study on Frequency Coherence Properties of Light Beams ,IEEE JOURNAL OF QUANTUM ELECTRONICS,2009 ,45(5-6):514-522
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