中国物理B ›› 2010, Vol. 19 ›› Issue (7): 74201-074201.doi: 10.1088/1674-1056/19/7/074201

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Relations between chirp transform and Fresnel diffraction, Wigner distribution function and a fast algorithm for chirp transform

石鹏, 曹国威, 李永平   

  1. Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2009-08-31 修回日期:2009-12-14 出版日期:2010-07-15 发布日期:2010-07-15

Relations between chirp transform and Fresnel diffraction, Wigner distribution function and a fast algorithm for chirp transform

Shi Peng(石鹏) , Cao Guo-Wei(曹国威), and Li Yong-Ping(李永平)   

  1. Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
  • Received:2009-08-31 Revised:2009-12-14 Online:2010-07-15 Published:2010-07-15

摘要: Two physical interpretations of chirp transform related to Fresnel diffraction and Wigner distribution function are given. The chirp transform can be regarded as a Fresnel diffraction observed on a spherical tangent to the diffraction plane, or a rotation and stretching transformation of the Wigner distribution function space. A general fast algorithm for the numerical calculation of chirp transform is developed by employing two fast Fourier transform algorithms. The algorithm, by which a good evaluation can be achieved, unifies the calculations of Fresnel diffraction, arbitrary fractional-order Fourier transforms and other scalar diffraction systems. The algorithm is used to calculate the Fourier transform of a Gaussian function and the Fourier transform, the Fresnel transform, the Fractional-order Fourier transforms of a rectangle function to evaluate the performance of this algorithm. The calculated results are in good agreement with the analytical results, both in the amplitude and phase.

Abstract: Two physical interpretations of chirp transform related to Fresnel diffraction and Wigner distribution function are given. The chirp transform can be regarded as a Fresnel diffraction observed on a spherical tangent to the diffraction plane, or a rotation and stretching transformation of the Wigner distribution function space. A general fast algorithm for the numerical calculation of chirp transform is developed by employing two fast Fourier transform algorithms. The algorithm, by which a good evaluation can be achieved, unifies the calculations of Fresnel diffraction, arbitrary fractional-order Fourier transforms and other scalar diffraction systems. The algorithm is used to calculate the Fourier transform of a Gaussian function and the Fourier transform, the Fresnel transform, the Fractional-order Fourier transforms of a rectangle function to evaluate the performance of this algorithm. The calculated results are in good agreement with the analytical results, both in the amplitude and phase.

Key words: chirp transform, Fresnel diffraction, Wigner distribution function ,  fractional Fourier transform

中图分类号:  (Modulation, tuning, and mode locking)

  • 42.60.Fc
02.50.Ng (Distribution theory and Monte Carlo studies) 02.30.Uu (Integral transforms) 02.60.Nm (Integral and integrodifferential equations)