@inproceedings{28a9330a9d6e455f8a8a68bb9ad90bc9,
title = "Time-delayed source and interferometric measurement of domes and windows",
abstract = "Measurement of the transmitted wavefront of domes and windows is a long-standing problem. One may use a large return sphere and measure the interference cavity without the dome present and again with the dome present. The difference between the two measurements is a double-pass measurement of the transmitted wavefront of the dome. Even so, the long coherence length of the source results in many extraneous fringe patterns. Windows may be tested by using a collimated source and return flat. A time-delayed source (TDS) having a short-coherence length is used to obtain a single interference pattern due only to interference of light reflected by the two surfaces of a dome or window. Standard phase shifting algorithms may be used with the TDS to measure the optical thickness of a dome or window without errors due to multiple reflections. Since most of the interferometer is common-path, environmental sensitivity is reduced and alignment is straightforward compared to typical interferometers. Finally, since there is no reference surface, stitching of sub-aperture measurements is simplified.",
keywords = "Common path, Dome, Multiple reflections, Phase-shift, Short coherence, Stitching, Time-delay, Window",
author = "Kuhn, {William P.} and Matthew Dubin",
year = "2007",
month = nov,
day = "5",
doi = "10.1117/12.718810",
language = "English (US)",
isbn = "0819466670",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Window and Dome Technologies and Materials X",
note = "Window and Dome Technologies and Materials X ; Conference date: 11-04-2007 Through 12-04-2007",
}