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1 August 2005 Displacement sensor based on optical feedback interferometry in a GaN laser diode
Jukka T. Hast, Leszek Krehut, Risto A. Myllylä
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Optical Engineering, Vol. 44, Issue 8, 080504 (August 2005). https://doi.org/10.1117/1.2010167
Abstract
We describe an optical displacement sensor based on optical feedback interferometry in a blue-light emitting GaN laser diode. Also presented are preliminary results from measuring variations in the optical path length (OPL) of an external cavity (EC) in the 0- to 240-nm range. These results show that, within the specified range, the sensor follows linearly the OPL variation of the EC. Moreover, the slope between a reference and the measured OPL is 1.0003, and the average deviation from the linear slope is 5 nm in this range. Finally, we also consider the stability of the interference signal in long-term measurements.
©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)
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Jukka T. Hast, Leszek Krehut, and Risto A. Myllylä "Displacement sensor based on optical feedback interferometry in a GaN laser diode," Optical Engineering 44(8), 080504 (1 August 2005). https://doi.org/10.1117/1.2010167
Published: 1 August 2005
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Cited by 9 scholarly publications.
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KEYWORDS
Sensors
Interferometry
Gallium nitride
Semiconductor lasers
Ferroelectric materials
Laser resonators
Biomedical optics
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