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Proceedings Paper

Reducing the equivalent coherence length of multiwavelength combination source
Author(s): Dongning Wang
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Paper Abstract

The measurement resolution in white light interferometry is, to some extent, determined by the coherence length of the light source used. By the use of multi-wavelength combination source, the equivalent coherence length can be greatly reduced. In this paper, the fringe pattern from a multi-wavelength combination source consisting of three commonly used multi-mode laser diodes is transformed into a discrete fringe pattern. The system has a stable output and is suitable for high precision white light interferometric measurement where good system stability is required.

Paper Details

Date Published: 9 May 2000
PDF: 5 pages
Proc. SPIE 4077, International Conference on Sensors and Control Techniques (ICSC 2000), (9 May 2000); doi: 10.1117/12.385560
Show Author Affiliations
Dongning Wang, Hong Kong Polytechnic Univ. (Hong Kong)

Published in SPIE Proceedings Vol. 4077:
International Conference on Sensors and Control Techniques (ICSC 2000)

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