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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3123
Title: Experimental observation of the effect of astigmatic aperture lens on the spectral switches of polychromatic Gaussian beam
Authors: Raman S.
Bisht N.S.
Yadav B.K.
Mehrotra R.
Husain M.
Kandpal H.C.
Published in: Journal of Modern Optics
Abstract: Experimental results of a study, conducted to investigate the effect of an astigmatic aperture lens on the spectral switches observed with spatially coherent polychromatic light, are reported. It is found that the spectrum at the observation plane exhibits anomalous behavior after passing through the astigmatic aperture lens. It is shown that at a particular position of the aperture, the spectrum splits into two halves, while at other positions the spectrum either shifts towards lower frequencies (red shift) or shifts towards higher frequencies (blue shift). These spectral changes take place in the vicinity of the dark region of the diffraction pattern. Experimental observations show that the behavior of the spectral switch is affected by the astigmatism of the lens. It is found that the spectral minimum value and the transition height of the spectral switch change as the astigmatism of the lens changes. Moreover, the critical position of the aperture where spectral switch occurs also changes with the astigmatism of the lens. The results are consistent with the theoretical predictions [Pan, L.; Lu, B. Opt. Commun. 2004, 234, 13-22].
Citation: Journal of Modern Optics (2008), 55(10): 1629-1638
URI: https://doi.org/10.1080/09500340701750941
http://repository.iitr.ac.in/handle/123456789/3123
Issue Date: 2008
Keywords: Aperture lens
Astigmatism
Spectral switches
ISSN: 9500340
Author Scopus IDs: 14621730100
23468866700
35815257400
16031906700
7201522764
7003383488
Author Affiliations: Raman, S., Optical Radiation Standards, National Physical Laboratory, New Delhi, India, Department of Physics, Jamia Milia Islamia (Central University), New Delhi, India
Bisht, N.S., Optical Radiation Standards, National Physical Laboratory, New Delhi, India
Yadav, B.K., Optical Radiation Standards, National Physical Laboratory, New Delhi, India
Mehrotra, R., Optical Radiation Standards, National Physical Laboratory, New Delhi, India
Husain, M., Department of Physics, Jamia Milia Islamia (Central University), New Delhi, India
Kandpal, H.C., Optical Radiation Standards, National Physical Laboratory, New Delhi, India
Funding Details: The authors are thankful to the Director National Physical Laboratory, New Delhi for permission to publish this paper. The authors S.R. and N.S.B. wish to thank CSIR for financial support as Senior Research Fellowship. They are also thankful to Mr Trailokya Saud for his help in experimental work.
Corresponding Author: Kandpal, H. C.; Optical Radiation Standards, National Physical Laboratory, New Delhi, India; email: hckandpal@mail.nplindia.ernet.in
Appears in Collections:Journal Publications [CY]

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