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Proceedings Paper

Effects Of Wedge And Surface Power On Transmitted Wavefront As A Function Of The Window Tilt Angle
Author(s): Murty V. Mantravadi; R. J. von Handorf
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Paper Abstract

Windows of different materials are used through which radiation passes onto the sensors behind them. The sensors are usually optical systems designed to have near diffraction-limited performance with detectors located in their focal planes. If the window has defects such as wedge angle, surface power etc., any plane wave entering it will not remain as a plane wave nor will its direction remain the same as before. Thus the sensor receives a distorted and deviated wave and hence will not form a diffraction-limited image in its focal plane at the proper place. It is frequently necessary to tilt the window at a considerable angle with respect to the optical axis of the sensor. Any wedge and surface errors are accentuated because of this large tilt of the window. We present here a simple analysis of the wedge and surface power effects of the window on the wave-front transmitted by it. A simple demonstration of these effects was shown using two windows made of BK7 glass and obtaining the interference patterns at different tilt angles. One window was made with a very slight wedge angle while the second window was made with slight surface power. The demonstration confirms the results of the simple analysis presented here.

Paper Details

Date Published: 22 December 1989
PDF: 11 pages
Proc. SPIE 1168, Current Developments in Optical Engineering and Commercial Optics, (22 December 1989); doi: 10.1117/12.962983
Show Author Affiliations
Murty V. Mantravadi, Northrop Corporation (United States)
R. J. von Handorf, Northrop Corporation (United States)

Published in SPIE Proceedings Vol. 1168:
Current Developments in Optical Engineering and Commercial Optics
Robert E. Fischer; Harvey M. Pollicove; Warren J. Smith, Editor(s)

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