14 February 2005 Self-mixing sensitivity dependence of dual-polarization microchip Nd:YAG lasers on the frequency difference of orthogonal polarizations
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Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005); doi: 10.1117/12.576600
Event: Photonics Asia, 2004, Beijing, China
Abstract
In this paper, we demonstrate the evolution of the self-mixing phenomena of dual-polarization microchip Nd:YAG lasers as we change the feedback strength and the frequency difference. At high feedback level the microchip laser's polarization flips orthogonally as the external mirror moves. Especially, we observed that the intensity modulation amplitude varies periodically with the frequency difference of orthogonal polarizations, and that with different types of targets the periodic change always exists. A qualitative model is put forward and is in good agreement with the experimental results. The results can be applied to the self-mixing sensitivity enhancement, and also presents a novel method of absolute distance measurement.
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Xinjun Wan, Shulian Zhang, "Self-mixing sensitivity dependence of dual-polarization microchip Nd:YAG lasers on the frequency difference of orthogonal polarizations", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); doi: 10.1117/12.576600; https://doi.org/10.1117/12.576600
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KEYWORDS
Polarization

Modulation

Nd:YAG lasers

Ferroelectric materials

Crystals

Switching

Signal to noise ratio

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