中国物理B ›› 2012, Vol. 21 ›› Issue (11): 114204-114204.doi: 10.1088/1674-1056/21/11/114204

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Saturation of biphoton generation near atomic resonance

陈鹏, 钱军, 胡正峰, 王育竹   

  1. Key Laboratory for Quantum Optics, Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2012-03-05 修回日期:2012-05-09 出版日期:2012-10-01 发布日期:2012-10-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10804115), the National Basic Research Program of China (Grant Nos. 2006CB921202 and 2011CB921504), the Knowledge Innovation Project of Chinese Academy of Sciences, and the Shanghai Committee of Science and Technology, China (Grant No. 09DJ1400700).

Saturation of biphoton generation near atomic resonance

Chen Peng (陈鹏), Qian Jun (钱军), Hu Zheng-Feng (胡正峰), Wang Yu-Zhu (王育竹 )   

  1. Key Laboratory for Quantum Optics, Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2012-03-05 Revised:2012-05-09 Online:2012-10-01 Published:2012-10-01
  • Contact: Wang Yu-Zhu E-mail:yzwang@mail.shcnc.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10804115), the National Basic Research Program of China (Grant Nos. 2006CB921202 and 2011CB921504), the Knowledge Innovation Project of Chinese Academy of Sciences, and the Shanghai Committee of Science and Technology, China (Grant No. 09DJ1400700).

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摘要： We have numerically investigated the biphoton generation rate as a function of several parameters in the spontaneous four wave mixing in cold atoms. It has been found that the biphoton generation rate can easily reach saturation with the intensity of the coupling laser increasing. The saturation intensity is mainly dependent on the dephasing rate of the ground states, unrelated to the pumping laser. It implies that though the biphoton waveform can be manipulated by the coupling laser, the generation rate of the biphoton cannot increase markedly after the saturation. The saturation effect also suggests that there is an optimal coupling laser for obtaining the largest biphoton generation rate with the sufficiently long coherence time.

关键词: two-photon generation, four wave mixing, cold atoms

Abstract: We have numerically investigated the biphoton generation rate as a function of several parameters in the spontaneous four wave mixing in cold atoms. It has been found that the biphoton generation rate can easily reach saturation with the intensity of the coupling laser increasing. The saturation intensity is mainly dependent on the dephasing rate of the ground states, unrelated to the pumping laser. It implies that though the biphoton waveform can be manipulated by the coupling laser, the generation rate of the biphoton cannot increase markedly after the saturation. The saturation effect also suggests that there is an optimal coupling laser for obtaining the largest biphoton generation rate with the sufficiently long coherence time.

Key words: two-photon generation, four wave mixing, cold atoms

中图分类号:  (Quantum state engineering and measurements)

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