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Spectral Intensity Distribution of a Time Dependent Gaussian Pulsed Beam From a Circular Aperture in the Near-Field Diffraction |
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| Authors: | |
| Institution: | (1) Department of Electrical Engineering, Da Yeh University, Da-Tsuen 515, Taiwan, R.O.C.;(2) Department of Electronic Engineering, Chung Chou Institute of Technology, Yuan-lin 510, Taiwan, R.O.C.;(3) Department of Electronic Engineering, Chung Chou Institute of Technology, 6, Lane 2, Section 3, Sunchao Road, Yuanlin 510, Changhua, Taiwan, R.O.C. |
| Abstract: | The diffraction characteristics of a broadband light source from a circular aperture in the near-field are clarified theoretically via prompt and precise mathematical derivation. This paper provides a explicit way of treating in the case of time dependent Gaussian-shaped pulsed beam passing through a circular aperture and gives more accurate and concrete criteria for judging the timing of the spectral red shift, blue shift and splitting of light distributions. Furthermore, the results offer an understanding of the Gaussian beam quality of the output of an optical resonator in the near-field. |
| Keywords: | Gaussian-shaped pulse duration time near-field diffraction circular aperture spectrum bandwidth spectral intensity Fresnel diffraction integral Lommel-function |
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