Rugate mirrors on optical fiber for sensor applications

Anatoli A. Chtcherbakov; Pieter L. Swart; Stephanus J. Spammer; Pavel V. Bulkin

doi:10.1117/12.221714

25 September 1995 Rugate mirrors on optical fiber for sensor applications

Anatoli A. Chtcherbakov, Pieter L. Swart, Stephanus J. Spammer, Pavel V. Bulkin

Proceedings Volume 2510, Fiber Optic and Laser Sensors XIII; (1995) https://doi.org/10.1117/12.221714
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

An all-fiber Fabry-Perot interferometer using coherence demultiplexing and rugate mirror reflectors grown with electron cyclotron resonance plasma enhanced chemical vapor deposition (ECR-PECVD) on the fiber ends is proposed. The interferometer consists of a laser diode source, two optical fiber cavities, three rugate mirrors, a phase modulator and phase detection system. Coherence demultiplexing allowed the use of fiber cavities of several meters in length with a partially coherent illuminating light source. Truly inhomogeneous refractive index mirrors were designed taking into account dispersion and losses of SiO_xN_y at the required wavelength of 1.3 micrometers . The reflectance/transmittance ratio during growth were adjustable from 0.05/0.95 to 0.95/0.05 and mirrors used in the experimental interferometer had no inal reflectances of 40%, 68%, and 40% respectively. Design and fabrication procedures permit implementation of window functions and matching layers for flexible control over transmittance and reflectance charateristics. The long-cavity Fabry-Perot sensor was demonstrated for use as a strain gauge. Good agreement was shown with results obtained by a conventional strain gauge.

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Anatoli A. Chtcherbakov, Pieter L. Swart, Stephanus J. Spammer, and Pavel V. Bulkin "Rugate mirrors on optical fiber for sensor applications", Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); https://doi.org/10.1117/12.221714

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KEYWORDS

Mirrors

Sensors

Optical fibers

Fabry–Perot interferometry

Reflectivity

Interferometers

Light sources

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