中国物理B ›› 2005, Vol. 14 ›› Issue (4): 764-770.doi: 10.1088/1009-1963/14/4/021

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Intensity correlation time of a single-mode laser driven by two coloured noises with coloured cross-correlation with direct signal modulation

王忠龙1, 曹力2, 陈黎梅3, 吴大进4   

  1. (1)Department of Physics, Huazhong University of Science and Technology, Wuhan,430074, China; (2)Department of Physics, Shenzhen University, Shenzhen, 518057, China; (3)State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan, 430074, China; (4)State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan, 430074, China; China Centre of Advanced Science and Technology (World Laboratory),Beijing,100080, China
  • 收稿日期:2004-08-11 修回日期:2004-12-13 出版日期:2005-04-20 发布日期:2005-03-28
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10275025).

Intensity correlation time of a single-mode laser driven by two coloured noises with coloured cross-correlation with direct signal modulation

Chen Li-Mei (陈黎梅)ab, Cao Li (曹力)ad, Wu Da-Jin (吴大进)cd, Wang Zhong-Long (王忠龙)c    

  1. a State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China; b Department of Physics, Shenzhen University, Shenzhen 518057, China; c Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; d  China Centre of Advanced Science and Technology (World Laboratory), Beijing 100080, China
  • Received:2004-08-11 Revised:2004-12-13 Online:2005-04-20 Published:2005-03-28
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10275025).

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摘要： In this paper, the intensity correlation time T is studied for the gain-noise model of a single-mode laser driven by coloured pump noise and coloured quantum noise with coloured cross-correlation with a direct signal modulation. By using the linear approximation method, it is found that when the pump noise is modulated directly by a signal, the effects of the cross-correlation between the pump noise and the quantum noise will disappear. In addition, there exists a maximum (i.e. resonance) in the curve of the intensity correlation time $T$ versus the pump noise self-correlation time \tau1. Furthermore, when \tau1\le\tau2, the intensity correlation time T increases monotonically with the increase of $D$ and decreases monotonically with the increase of Q, but when \tau1>\tau2, the intensity correlation time T increases monotonically with the increase of Q and decreases monotonically with the increase of D.

Abstract: In this paper, the intensity correlation time T is studied for the gain-noise model of a single-mode laser driven by coloured pump noise and coloured quantum noise with coloured cross-correlation with a direct signal modulation. By using the linear approximation method, it is found that when the pump noise is modulated directly by a signal, the effects of the cross-correlation between the pump noise and the quantum noise will disappear. In addition, there exists a maximum (i.e. resonance) in the curve of the intensity correlation time $T$ versus the pump noise self-correlation time $\tau_1$. Furthermore, when $\tau_1\leq \tau_2$, the intensity correlation time T increases monotonically with the increase of $D$ and decreases monotonically with the increase of Q, but when $\tau_1>\tau_2$, the intensity correlation time T increases monotonically with the increase of Q and decreases monotonically with the increase of D.

Key words: intensity correlation time, direct modulation signal, linear approximation method

中图分类号:  (Quantum fluctuations, quantum noise, and quantum jumps)

  • 42.50.Lc
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.60.Fc (Modulation, tuning, and mode locking)