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14 February 2005 Laser diode noise impact on interferometric applications
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Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005)
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico
The Laser Diode intensity noise as a function of laser current and temperature has been studied in this paper. It is shown that the intensity noise in the current-temperature coordinates forms "islands" of noise amid larger areas of relatively low-noise operation. Although these "islands" of noise exhibit some drift over time, it is generally possible to find operational points characterized by long-term stability and low noise. We show also that the laser noise severely deteriorates the signal-to-noise ratio (SNR) at the receiver --photodiode circuit-- causing random fluctuations of SNR, impairing the performance of interferometric applications. The comparison of noise distributions for isolated laser modules and laser modules incorporated into laser Doppler velocimeters allowed us to reveal design faults contributing to unwanted back reflections deteriorating the overall SNR and operationl stability of the system.
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Lesya Blagova, Alex Gluzmann, and Ivan Popov "Laser diode noise impact on interferometric applications", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005);

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