Ultra-Low Mean-Photon-Number Measurement with Balanced Optical Heterodyne Detection

Chin. Phys. Lett.

2004, Vol. 21

Issue (4): 671-674 DOI:

Original Articles

Ultra-Low Mean-Photon-Number Measurement with Balanced Optical Heterodyne Detection

LI Gang;LI Li-Ping;DU Zhi-Jing;LIU Tao;ZHANG Tian-Cai;WANG Jun-Min

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006

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LI Gang, LI Li-Ping, DU Zhi-Jing et al 2004 Chin. Phys. Lett. 21 671-674

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Abstract Determination of an ultra-low mean photon number is an important issue, either for precise optical measurement or understanding the interaction between individual atoms and photons inside an optical cavity. By utilizing a homemade balanced optical heterodyne detection system, the cw minimum measurable power of 3.6 fW has been reached, whereas the minimum mean photon number of = 0.0014 in our micro-cavity with finesse of 2 x 10⁵ and optical length of 48 μm can be realized.

Keywords: 42.79.-e

Published: 01 April 2004

PACS:

42.79.-e

(Optical elements, devices, and systems)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2004/V21/I4/0671

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