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9 June 2017 Study on the resolution improvement of a range finder using the chaotic frequency characteristics of a laser diode
Takahiro Saito, Shinya Maehara, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa
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Optical Engineering, Vol. 56, Issue 6, 064101 (June 2017). https://doi.org/10.1117/1.OE.56.6.064101
Abstract
An optical range finder system that relies on laser diodes’ frequency noise, instead of intensity or frequency modulations, and its improvement in resolution are reported. The distance to the target is measured by calculating the cross-correlation of two signals reflected from the target and reference mirrors. These two signals are converted from the laser diodes’ frequency noise signals by frequency/intensity converters, such as a Fabry–Perot etalon. We obtained the distance to the target by checking time lags between the target and reference beams at the highest correlation coefficient. We also measured the change in the correlation coefficient around the peak sampling point by adjusting the reference-path length, achieving a resolving power of ±3  mm.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Takahiro Saito, Shinya Maehara, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, and Masashi Ohkawa "Study on the resolution improvement of a range finder using the chaotic frequency characteristics of a laser diode," Optical Engineering 56(6), 064101 (9 June 2017). https://doi.org/10.1117/1.OE.56.6.064101
Received: 24 January 2017; Accepted: 11 May 2017; Published: 9 June 2017
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KEYWORDS
Semiconductor lasers
Fabry–Perot interferometers
Frequency modulation
Interference (communication)
Mirrors
Spectral resolution
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