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24 October 2005 An alternative method for evaluating the coherence length of a laser diode
Po-Jen Hsieh, Zhi-Cheng Jian, Der-Chin Su
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Proceedings Volume 9664, Ninth International Topical Meeting on Education and Training in Optics and Photonics; 96642N (2005) https://doi.org/10.1117/12.2207729
Event: Ninth International Topical Meeting on Education and Training in Optics and Photonics, 2005, Marseille, France
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.
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Po-Jen Hsieh, Zhi-Cheng Jian, and Der-Chin Su "An alternative method for evaluating the coherence length of a laser diode", Proc. SPIE 9664, Ninth International Topical Meeting on Education and Training in Optics and Photonics, 96642N (24 October 2005); https://doi.org/10.1117/12.2207729
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KEYWORDS
Semiconductor lasers
Michelson interferometers
Coherence (optics)
Modulators
Teeth
Beam splitters
Electrooptic modulators
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