29 April 2010 Compact diode laser homodyne vibrometers
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We discuss the architecture and performance of compact, robust, alignment-free, homodyne vibrometers using telecom diode lasers as the illumination source. The technical challenges and performance of implementations using conventional macroscopic optical components are compared with ultra-miniature micro-bench components and assembly methods. Focused sensitivity exceeding 4.6 pm/SQRT(Hz) at 1m range, 23 pm/SQRT(Hz) at 5m range, and useful operation to >20m have been demonstrated with COTS 1550 nm sources, 1.5 cm transmit/receive beam diameter and 32 mW transmitted power. Vibrometer measurement bandwidth exceeds 100 kHz with current electronics. Demonstrated performance is suitable for a variety of defense, security, and inspection applications.
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Christian J. Grund, Harald Guenther, John Connolly, "Compact diode laser homodyne vibrometers", Proc. SPIE 7684, Laser Radar Technology and Applications XV, 76840V (29 April 2010); doi: 10.1117/12.850591; https://doi.org/10.1117/12.850591

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