Effects Of Wedge And Surface Power On Transmitted Wavefront As A Function Of The Window Tilt Angle

Murty V. Mantravadi; R. J. von Handorf

doi:10.1117/12.962983

22 December 1989 Effects Of Wedge And Surface Power On Transmitted Wavefront As A Function Of The Window Tilt Angle

Murty V. Mantravadi, R. J. von Handorf

Proceedings Volume 1168, Current Developments in Optical Engineering and Commercial Optics; (1989) https://doi.org/10.1117/12.962983
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

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.

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Murty V. Mantravadi and R. J. von Handorf "Effects Of Wedge And Surface Power On Transmitted Wavefront As A Function Of The Window Tilt Angle", Proc. SPIE 1168, Current Developments in Optical Engineering and Commercial Optics, (22 December 1989); https://doi.org/10.1117/12.962983

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KEYWORDS

Sensors

Optical engineering

Spherical lenses

Refractive index

Interferometers

Optical design

Wavefronts

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