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Proceedings Paper

Collimation testing techniques: a review
Author(s): Rajpal S. Sirohi
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Paper Abstract

Collimation of beam is essential in long path interferometry otherwise significant measurement error may be introduced. Therefore, considerable efforts were spent in developing techniques of collimation testing. In laser interferometers, the source is effectively a point. However, its axial shift from the focus of the collimator introduces a curvature in the wave front and its lateral shift may introduce off-axis aberrations. Therefore, the objective is to place the point source at the focus of the collimator. This task is achieved by collimation testing techniques, which can be grouped under interferometry, shear interferometry, Talbot interferometry, and phase conjugate interferometry. We will discuss these techniques below.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354754
Show Author Affiliations
Rajpal S. Sirohi, Indian Institute of Technology (India)


Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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