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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)† |
Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China |
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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.
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Received: 31 August 2009
Revised: 14 December 2009
Accepted manuscript online:
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PACS:
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42.60.Fc
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(Modulation, tuning, and mode locking)
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02.50.Ng
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(Distribution theory and Monte Carlo studies)
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02.30.Uu
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(Integral transforms)
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02.60.Nm
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(Integral and integrodifferential equations)
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Cite this article:
Shi Peng(石鹏) , Cao Guo-Wei(曹国威), and Li Yong-Ping(李永平) Relations between chirp transform and Fresnel diffraction, Wigner distribution function and a fast algorithm for chirp transform 2010 Chin. Phys. B 19 074201
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