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3 June 2019 Autodyne interferometry of distance by injected current modulation of laser diode
D. A. Usanov, An. V. Skripal, S. Yu. Dobdin, A. V. Dzhafarov
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Proceedings Volume 11066, Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling; 1106609 (2019) https://doi.org/10.1117/12.2522674
Event: International Symposium on Optics and Biophotonics VI: Saratov Fall Meeting 2018, 2018, Saratov, Russian Federation
Abstract
Laser self-mixing interferometry of absolute distances is represented by the method of frequency modulation of supply current of the laser diode (FMCW technique). The advantages of the triangular wave modulation method in combination with the use of the frequency of the self-mixing signal spectrum have been shown. The advantages of the harmonic wave modulation method in combination with the use of the some various amplitudes of the self-mixing signal spectrum have been shown were shown also. The advantages of the harmonic wave modulation method in combination with the use of different amplitudes of the spectrum of self-mixing signals are shown. The equipment includes a frequency-modulated semiconductor self-mixing laser diode RLD-650 on quantum-size structures with a diffraction-limited single spatial mode with a wavelength of 654 nm. The results of computer simulation showed that the accuracy of determining the distance at the harmonic wave modulation decreases with increasing the distance to the measured object. But at small distances, its value is much smaller than at the triangular wave modulation of laser radiation.
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D. A. Usanov, An. V. Skripal, S. Yu. Dobdin, and A. V. Dzhafarov "Autodyne interferometry of distance by injected current modulation of laser diode", Proc. SPIE 11066, Saratov Fall Meeting 2018: Laser Physics, Photonic Technologies, and Molecular Modeling, 1106609 (3 June 2019); https://doi.org/10.1117/12.2522674
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KEYWORDS
Phase shift keying
Reflectors
Laser resonators
Interference (communication)
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