期刊
OPTICS EXPRESS
卷 19, 期 10, 页码 9201-9212出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.009201
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds quebecois de recherche sur la nature et les technologies (FQRNT)
- Canadian Institute for Photonic Innovations (ICIP/CIPI)
- Centre d'optique, photonique et laser (COPL), Quebec
A parabolic mirror illuminated with an incident collimated beam whose axis of propagation does not exactly coincide with the axis of revolution of the mirror shows distortion and strong coma. To understand the behavior of such a focused beam, a detailed description of the electric field in the focal region of a parabolic mirror illuminated with a beam having a nonzero angle of incidence is required. We use the Richards-Wolf vector field equation to investigate the electric energy density distribution of a beam focused with a parabolic mirror. The explicit aberration function of this focused field is provided along with numerically calculated electric energy densities in the focal region for different angles of incidence. The location of the peak intensity, the Strehl ratio and the full-width at half-maximum as a function of the angle of incidence are given and discussed. The results confirm that the focal spot of a strongly focused beam is affected by severe coma, even for very small tilting of the mirror. This analysis provides a clearer understanding of the effect of the angle of incidence on the focusing properties of a parabolic mirror as such a focusing device is of growing interest in microscopy. (C) 2011 Optical Society of America
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