Acta Optica Sinica, Volume. 30, Issue 10, 2918(2010)
Speckle Correlation Used in Measurement of Elliptical Gaussian Beam Divergence
Divergent angle of laser beam which used in laser guidance and measurement is an important parameter. Large area illumination of laser is also an important application in large-scale speckle interferometry. The relation between speckle size and elliptical Gaussian laser beam illumination parameter is derived by using speckle auto-correlation, and the effective two-dimensional lighting size at receiving plane is calculated, the divergence according to the lighting sizes at different distances futhermore determined. This device is simply constructed. Using laser speckle auto-correlation metrology methods the dynamic range of laser intensity is enlarged, ignoring the off-axis influence, and environmental light is suppressed.
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Huang Zhanhua, Zhu Meng, Cai Huaiyu, Zhang Yinxin. Speckle Correlation Used in Measurement of Elliptical Gaussian Beam Divergence[J]. Acta Optica Sinica, 2010, 30(10): 2918
Category: Instrumentation, Measurement and Metrology
Received: Nov. 12, 2009
Accepted: --
Published Online: Oct. 24, 2012
The Author Email: Zhanhua Huang (zhanhua@tju.edu.cn)