Measurements of femtosecond temporal speckle field of a random medium

doi:10.1088/1674-1056/19/2/024204

中国物理B ›› 2010, Vol. 19 ›› Issue (2): 24204-024204.doi: 10.1088/1674-1056/19/2/024204

Measurements of femtosecond temporal speckle field of a random medium

刘文军, 高仁喜, 曲士良

Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China

收稿日期:2009-03-04 修回日期:2009-07-23 出版日期:2010-02-15 发布日期:2010-02-15
基金资助:
Project supported by the Scientific Research Foundation of Harbin Institute of Technology at Weihai, China (Grant No. 2008087).

Measurements of femtosecond temporal speckle field of a random medium

Liu Wen-Jun(刘文军)^†, Gao Ren-Xi(高仁喜), and Qu Shi-Liang(曲士良)

Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China

Received:2009-03-04 Revised:2009-07-23 Online:2010-02-15 Published:2010-02-15
Supported by:
Project supported by the Scientific Research Foundation of Harbin Institute of Technology at Weihai, China (Grant No. 2008087).

摘要/Abstract

摘要： The femtosecond temporal speckle field of a random medium is studied theoretically and experimentally. Femtosecond temporal speckle arises from the interference of multiple randomly scattered electric fields. The femtosecond temporal speckle field is measured with a cross-correlation frequency-resolved optical gating method. The spatial average of the speckle field yields a smooth transmitted profile. The speckle field is a circular complex Gaussian variable because the scattered light beams from different trajectories have no correlation with each other. The field and the intensity profiles of individual speckle spots fluctuate randomly in time. The ensemble average of the temporal intensity profiles converges, thereby yielding the photon travel time probability distribution function.

Abstract: The femtosecond temporal speckle field of a random medium is studied theoretically and experimentally. Femtosecond temporal speckle arises from the interference of multiple randomly scattered electric fields. The femtosecond temporal speckle field is measured with a cross-correlation frequency-resolved optical gating method. The spatial average of the speckle field yields a smooth transmitted profile. The speckle field is a circular complex Gaussian variable because the scattered light beams from different trajectories have no correlation with each other. The field and the intensity profiles of individual speckle spots fluctuate randomly in time. The ensemble average of the temporal intensity profiles converges, thereby yielding the photon travel time probability distribution function.

Key words: temporal speckle, femtosecond pulse, statistical mechanism

中图分类号: (Optical instruments and equipment)

07.60.-j

42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 02.50.Cw (Probability theory)

刘文军, 高仁喜, 曲士良. Measurements of femtosecond temporal speckle field of a random medium[J]. 中国物理B, 2010, 19(2): 24204-024204.

Liu Wen-Jun(刘文军), Gao Ren-Xi(高仁喜), and Qu Shi-Liang(曲士良). Measurements of femtosecond temporal speckle field of a random medium[J]. Chin. Phys. B, 2010, 19(2): 24204-024204.

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Measurements of femtosecond temporal speckle field of a random medium

Measurements of femtosecond temporal speckle field of a random medium

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