【摘要】：利用通信波段雙通道單光子探測器,采用Hanbury Brown-Twiss關(guān)聯(lián)測量方案,理論分析并實(shí)驗(yàn)測量了光反饋半導(dǎo)體激光器產(chǎn)生的混沌光場的光子統(tǒng)計(jì)分布及不同混沌狀態(tài)光場的二階相干度.通過對混沌光場二階相干度g~((2))(τ)的理論分析,得出隨著延遲時(shí)間和相干時(shí)間的變化,其與相干光、熱光及單光子態(tài)的二階相干度可明顯區(qū)分并呈現(xiàn)出不同分布.同時(shí)實(shí)驗(yàn)上產(chǎn)生了頻譜寬度6.7 GHz的混沌光場,測量了不同光子數(shù)分布的結(jié)果,并用高斯隨機(jī)分布、泊松分布、玻色-愛因斯坦分布對光子數(shù)分布進(jìn)行理論擬合,發(fā)現(xiàn)隨著入射平均光子數(shù)的增加,光子數(shù)分布從玻色-愛因斯坦分布過渡到泊松分布,但整個過程都與高斯隨機(jī)分布符合較好,且光場的二階相干度g~((2))(0)由2降至1.通過改變偏置電流(I=1.0Ith-2.0Ith)和反饋強(qiáng)度(0—10%),實(shí)驗(yàn)上研究了混沌光場由低頻起伏到相干塌陷的過程中不同狀態(tài)宏觀動力學(xué)特性與二階相干度的對應(yīng)關(guān)系.結(jié)果表明:混沌光場在此過程中始終呈現(xiàn)出明顯的聚束效應(yīng),并在頻譜寬度最大時(shí)達(dá)到最強(qiáng);同時(shí)給出了光子計(jì)數(shù)測量中聚束效應(yīng)減弱的物理原因.實(shí)驗(yàn)表明該系統(tǒng)及方法能很好地揭示不同狀態(tài)混沌光場的光子統(tǒng)計(jì)特性.
[Abstract]:Using the two-channel single-photon detector in the communication band and the Hanbury Brown-Twiss correlation measurement scheme, the photon statistical distribution of the chaotic light field generated by the optical feedback semiconductor laser and the second-order coherence of the light field in different chaotic states are theoretically analyzed and experimentally measured. Based on the theoretical analysis of the second order coherence degree g ~ (2) (蟿) of chaotic light field, it is concluded that with the change of delay time and coherent time, the second order coherence degree of coherent light, thermal light and single photon state can be distinguished obviously and present different distributions. At the same time, a chaotic light field with a spectral width of 6.7 GHz is produced experimentally. The results of different photon number distributions are measured, and the photonic number distributions are fitted by Gao Si random distribution, Poisson distribution and Bose-Einstein distribution. It is found that the photon number distribution changes from Bose-Einstein distribution to Poisson distribution with the increase of the incident average photon number, but the whole process is in good agreement with Gao Si's random distribution, and the second order coherence degree g ~ (2) (0) of the light field decreases from 2 to 1. By changing the bias current (I=1.0Ith-2.0Ith) and the feedback intensity (0-10%), the relationship between the macroscopic dynamic characteristics of different states and the second-order coherence in the process of chaotic light field from low frequency fluctuation to coherent collapse is studied experimentally. The results show that the chaotic light field always shows obvious bunching effect in the process and reaches its strongest when the spectrum width is the largest. The physical reasons for the attenuation of the bunching effect in photon counting measurement are also given. Experiments show that the system and the method can well reveal the photon statistical properties of chaotic light fields in different states.
【作者單位】： 太原理工大學(xué)新型傳感器與智能控制教育部重點(diǎn)實(shí)驗(yàn)室;太原理工大學(xué)物理與光電工程學(xué)院光電工程研究所;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:61405138,61505136,61505137,61671316) 國家國際科技合作專項(xiàng)(批準(zhǔn)號:2014DFA50870) 山西省自然科學(xué)基金(批準(zhǔn)號:201601D011015,201601D021021)資助的課題~~
【分類號】：O431.2

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