| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Experimental Study on Coherence Time of a Light Field with Single Photon Counting |
LI Yuan, ZHANG Yu-Chi, ZHANG Peng-Fei, GUO Yan-Qiang, LI Gang, WANG
Jun-Min, ZHANG Tian-Cai |
| State Key Laboratory of Quantum Optics and Quantum Optics Device, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006 |
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| Cite this article: |
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LI Yuan, ZHANG Yu-Chi, ZHANG Peng-Fei et al 2009 Chin. Phys. Lett. 26 074205 |
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Abstract The second-order degree of coherence of pseudo-thermal light and coherence time are experimentally studied via the Hanbruy-Brown-Twiss (HBT) scheme. The system consists of two non-photon-number-resolving single-photon-counting modules (SPCMs) operating in the Geiger mode. We investigate the coherence time of the incident beam for different spot sizes on a ground glass and speeds of a rotating ground glass. The corresponding coherence time can be obtained from Gaussian fitting for the measured second-order degree of coherence. The results show that the coherence time of measured pseudo-thermal light depends on the spot sizes and the rotating speeds of the ground glass. The maximum value of the second-order degree of coherence is reduced as the rotating speed decreases. This result can be well explained by the model of mixed thermal and coherent fields with different ratios.
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| Keywords:
42.50.Ar
42.60.Rn
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Received: 12 January 2009
Published: 02 July 2009
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