The statistical fluctuation of a single-mode laser system driven by coloured pump noise with signal modulation and the quantum noise with cross-correlation between its real and imaginary parts |
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| Authors: | Xu Dai-Hai Cheng Qing-Hu Cao Li Wu Da-Jin |
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| Affiliation: | School of Physical Science and Technology, Yangtze University, Jingzhou 434104, China; State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China; Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Using the linear approximation method, this paper studies the statistical propertyof a single-mode laser driven by both coloured pump noise with signal modulation andthe quantum noise with cross-correlation between its real and imaginary parts, andcalculates the steady-state mean normalized intensity fluctuation and intensitycorrelation time. It analyses the influences of the modulation signal, the net gaincoefficient, the noise and its correlation form on the statistical fluctuation ofthe laser system respectively. It is found that the coloured pump noise modulated bythe signal has a great suppressing action on the statistical fluctuation of thelaser system; the pump noise self-correlation time and the specific frequency ofmodulation signal have the result that the statistical fluctuation tends to zero.Furthermore, the `colour' correlation of pump noise has much influences on thestatistical fluctuation of the laser system. Increasing the intensity of pump noisewill augment the statistical fluctuation of the laser system, but the intensity ofquantum noise and the coefficient of cross-correlation between its real andimaginary parts have less influence on the statistical fluctuation of the lasersystem. Therefore, from the conclusions of this paper the statistical property canbe known and a theoretical basis for steady operation and output of the laser systemcan be provided. |
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| Keywords: | signal noise single-modelaser steady-state mean normalized intensity fluctuation intensitycorrelation time |
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