%0 Journal Article %T Experimental Study on Coherence Time of a Light Field with Single Photon Counting
%A LI Yuan %A ZHANG Yu-Chi %A ZHANG Peng-Fei %A GUO Yan-Qiang %A LI Gang %A WANGJun-Min %A ZHANG Tian-Cai %A
%J 中国物理快报 %D 2009 %I %X 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. %K 42 %K 50 %K Ar %K 42 %K 60 %K Rn
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=62166A98FD9D735FF0AA1D747EDE1A6F&yid=DE12191FBD62783C&vid=96C778EE049EE47D&iid=DF92D298D3FF1E6E&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0