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Proceedings Paper • Open Access

An alternative method for evaluating the coherence length of a laser diode
Author(s): Po-Jen Hsieh; Zhi-Cheng Jian; Der-Chin Su

Paper Abstract

Let a light beam coming from a diode pass through a polarizer and an electro-optical modulator driven a saw tooth voltage signal, then a slight frequency difference between its two linearly orthogonal polarized components occurs. The light beam enters a modified Michelson interferometer, and the interference signal is sent to an oscilloscope. Because the interference signal is a periodic function of time, it is easier than the conventional one to evaluate the contrast. When the contrast is zero, the associated optical path difference is its coherence length.

Paper Details

Date Published: 24 October 2005
PDF: 3 pages
Proc. SPIE 9664, Ninth International Topical Meeting on Education and Training in Optics and Photonics, 96642N (24 October 2005); doi: 10.1117/12.2207729
Show Author Affiliations
Po-Jen Hsieh, National Chiao-Tung Univ. (Taiwan)
Zhi-Cheng Jian, National Chiao-Tung Univ. (Taiwan)
Der-Chin Su, National Chiao-Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 9664:
Ninth International Topical Meeting on Education and Training in Optics and Photonics
François Flory, Editor(s)

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