Katzir, A. and Livanos, A. C. and Shellan, J. B. and Yariv, A. (1977) Chirped gratings in integrated optics. IEEE Journal of Quantum Electronics, 13 (4). pp. 296-304. ISSN 0018-9197 http://resolver.caltech.edu/CaltechAUTHORS:KATieeejqe77
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Gratings with variable periods (chirped gratings) have been fabricated by recording the interference pattern of a collimated laser beam with a converging beam generated by a cylindrical lens. An analysis is presented for the behavior of the chirped gratings as a function of wavelength, the angle between the illuminating beams, the F number of the lens, and its position. To calculate the power radiated into air, the coupled-mode equations are solved for the case of a waveguide with chirped surface corrugation. Experimentally, chirped gratings have been etched on the surface of an optical waveguide and used to couple light out of the waveguide. It was found that the light was focused outside the waveguide, and the fraction of the power radiated into air compared favorably with the theoretical calculation. The focal point outside the waveguide was found to move by about 1 cm when the wavelength was changed by 500 Å-in agreement with theoretical estimates.
|Additional Information:||© Copyright 1977 IEEE. Reprinted with permission. Manuscript received November 16, 1976; revised December 16, 1976. This research was supported by AFOSR. The work of one of the authors (J.B.S.) was supported in part by the Hertz Foundation. The authors wish to thank Prof. N. George for many helpful discussions, and D.R. Armstrong and P. Agmon for their assistance.|
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|Deposited On:||17 Mar 2008|
|Last Modified:||26 Dec 2012 09:52|
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