Abstract

In this paper, the first fiber-coupled no-moving-parts scanning heterodyne interferometer design using a single acoustooptic device (AOD) is reported. The design features a high-stability inline reflective architecture with free-space-scanned minimally invasive sensing via a multizone reflective sensor chip. The common path fiber interconnection allows robust remoting of the compact sensing front end. A proof-of-concept sensing experiment measuring voltage-dependent birefringence is successfully conducted using a voltage-controlled nematic liquid crystal (NLC) sensor chip. The system features a 4.69-dB optical loss, a 200-MHz output frequency, and a 1550-nm eye-safe operation wavelength. Applications for the system include any fiber-remoted sensing using the proposed free-space minimally invasive interrogating optical beams.

© 2005 IEEE

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Other (13)

P. Hariharan, Handbook of Optics, 2nd ed. M. Bass, Ed. New York: McGraw-Hill, 1995.

E. Udd, Fiber Optic Sensor, Wiley Series in Pure and Applied Optics, New York: Wiley, 1991.

J. Schwider, D. R. Herriot, J. E. Gallagher, D. P. Rosenfeld, A. D. White and D. J. Brangaccio, "Digital wavefront measuring interferometer for testing optical surfaces and lenses", Appl. Opt., vol. 13, no. 11, pp. 2693-2703, 1974.

B. Culshaw, "Optical fiber sensor technologies: opportunities and-perhaps-pitfalls", J. Lightw. Technol., vol. 22, no. 1, pp. 39-50, Jan. 2004.

I. Yamaguchi and K. Hamano, "Multiplexed heterodyne fiber interferometer that uses laser-diode modulation", Opt. Lett., vol. 20, no. 15, pp. 1661-1663, 1995.

C. Koch, "Measurement of ultrasonic pressure by heterodyne interferometry with a fiber-tip sensor", Appl. Opt., vol. 38, no. 13, pp. 2812-2819, 1999.

K. Chen, C. Hsu and D. Su, "Interferometric optical sensor for measuring glucose concentration", Appl. Opt., vol. 42, no. 28, pp. 5774-5776, 2003.

V. Vali and R. W. Shorthill, "Fiber-ring interferometer", Appl. Opt., vol. 15, no. 5, pp. 1099-1100, 1976.

S.-C. Lin and T. G. Giallorenzi, "Sensitivity analysis of the Sagnac-effect optical-fiber ring interferometer", Appl. Opt., vol. 18, no. 6, pp. 915-931, 1979.

Z.-M. Qi, K. Itoh, M. Murabayashi and H. Yanagi, "A composite optical waveguide-based polarimetric interferometer for chemical and biological sensing applications", J. Lightw. Technol., vol. 18, no. 8, pp. 1106-1110, Aug. 2000.

N. A. Riza and M. A. Arain, "Angstrom-range optical path-length measurement with a high-speed scanning heterodyne optical interferometer", Appl. Opt., vol. 42, no. 13, pp. 2341-2345, 2003.

M. van Buren and N. A. Riza, "Foundations for low-loss fiber gradient-index lens pair coupling with the self-imaging mechanism", Appl. Opt., vol. 42, no. 3, pp. 550-565, 2003.

MP 42 E User Manual, M-126 Series Linear Positioning Stages. PI Inc., Waldbronn, Germany.

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