Acta Photonica Sinica, Volume. 39, Issue 10, 1840(2010)
Propagation Characteristics of Nonparaxial Scalar Beams Diffracted by a Small Aperture
Based on the accurate definition of light intensity of nonparaxial scalar beams at the transverse plane, a comparative study of the beam widths, far-field divergence angles and M2 factors defined by the power in the bucket and second-order moment is made. Taking the nonparaxial diffraction of a small circular aperture as an example, the detailed numerical calculation is performed. The results show that the beam width, far-field divergence angle and M2 factor defined by the power in the bucket are less than that defined by the second-order moment. Both M2 factors tend to zero as beam waist vanishes, the propagation of beam width defined by the power in the bucket is different from the hyperbolic law.
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NIU Guo-jian, DENG Xiao-jiu, LIU Cai-xia, LI Guo-xiang. Propagation Characteristics of Nonparaxial Scalar Beams Diffracted by a Small Aperture[J]. Acta Photonica Sinica, 2010, 39(10): 1840
Received: Jan. 7, 2010
Accepted: --
Published Online: Dec. 7, 2010
The Author Email: Xiao-jiu DENG (dengxjxls@sina.com)
CSTR:32186.14.