Anomalous spectral behavior of vectorial apertured ultrashort pulsed beams beyond the paraxial approximation |
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| Authors: | Yuanjie Yang Kailiang Duan |
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| Institution: | a Department of Optoelectronic Science and Technology, College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
b State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an 710068, China |
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| Abstract: | Based on the vectorial Rayleigh diffraction integrals, the analytical expression for the spectral intensity of a vectorial nonparaxial ultrashort pulsed Gaussian beam diffracted at a circular hard-aperture is derived. The effect of f-parameter (f = 1/k0w0) on the spectral anomalies near phase singularities of the vectorial nonparaxial ultrashort pulsed beams is studied. It is shown that the spectral switch near the phase singularity of diffracted vectorial nonparaxial ultrashort pulsed beam still exists beyond paraxial regime, but disappears when the f-parameter is larger than a certain value. |
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| Keywords: | Vectorial nonparaxial ultrashort pulse Spectral switch Circular aperture Vector Rayleigh diffraction integrals f-Parameter |
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