摘要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.
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.
(Relaxation oscillations and long pulse operation)
引用本文:
LI Yuan;ZHANG Yu-Chi;ZHANG Peng-Fei;GUO Yan-Qiang;LI Gang;WANGJun-Min;ZHANG Tian-Cai. Experimental Study on Coherence Time of a Light Field with Single Photon Counting[J]. 中国物理快报, 2009, 26(7): 74205-074205.
LI Yuan, ZHANG Yu-Chi, ZHANG Peng-Fei, GUO Yan-Qiang, LI Gang, WANGJun-Min, ZHANG Tian-Cai. Experimental Study on Coherence Time of a Light Field with Single Photon Counting. Chin. Phys. Lett., 2009, 26(7): 74205-074205.
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2009, Vol. 26 
