Optical power meter using radiation pressure measurement

This paper describes a radiation pressure meter based on a diamagnetic spring. We take advantage of the diamagnetic property of pyrolytic carbon to make an elementary levitated system. It is equivalent to a torsional spring-mass-damper system consisting of a small pyrolytic carbon disc levitated abo...

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Bibliographic Details
Published in:arXiv.org 2018-07
Main Authors: Pinot, Patrick, Silvestri, Zaccaria
Format: Article
Language:English
Subjects:
Angular position
Carbon
Diamagnetism
Electric potential
Fiber optic communications
Fiber optic networks
Permanent magnets
Physical properties
Position measurement
Position sensing
Pressure measurement
Radiation pressure
Semiconductor lasers
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Summary:This paper describes a radiation pressure meter based on a diamagnetic spring. We take advantage of the diamagnetic property of pyrolytic carbon to make an elementary levitated system. It is equivalent to a torsional spring-mass-damper system consisting of a small pyrolytic carbon disc levitated above a permanent magnet array. There are several possible measurement modes. In this paper, only the angular response to an optical power single-step is described. An optical detection composed of a laser diode, a mirror and a position sensitive detector (PSD) allow measurement of the angular deflection proportional to the voltage delivered by the PSD. Once the parameters of the levitated system depending on its geometrical and physical characteristics have been determined regardless of any optical power, by applying a simple physical law, one can deduce the value of the optical power to be measured from the measurement of the first maximum of the output voltage amplitude.
ISSN:2331-8422
DOI:10.48550/arxiv.1808.06588