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Optics Letters

Optics Letters


  • Vol. 27, Iss. 13 — Jul. 1, 2002
  • pp: 1147–1149

Adaptive time-domain filtering for real-time spectral discrimination in a Michelson interferometer

Sameer R. Bhalotra, Helen L. Kung, Yang Jiao, and David A. B. Miller  »View Author Affiliations

Optics Letters, Vol. 27, Issue 13, pp. 1147-1149 (2002)

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We present a method of spectral discrimination that employs time-domain processing instead of the typical frequency-domain analysis and implement the method in a Michelson interferometer with a nonlinear mirror scan. The technique yields one analog output value per scan instead of a complete interferogram by directly filtering a measured scan with a reference function in the time domain. Such a procedure drastically reduces data-processing requirements downstream. Additionally, using prerecorded interferograms as references eliminates the need to compensate for scan nonlinearities, which broadens the field of usable components for implementation in miniaturized sensing systems. With our efficient use of known spectral signatures, we demonstrate real-time discrimination of 633- and 663-nm laser sources with a mirror scan length of 1 µm , compared with the Rayleigh criterion of 7 µm.

© 2002 Optical Society of America

OCIS Codes
(300.6190) Spectroscopy : Spectrometers
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(350.5730) Other areas of optics : Resolution

Sameer R. Bhalotra, Helen L. Kung, Yang Jiao, and David A. B. Miller, "Adaptive time-domain filtering for real-time spectral discrimination in a Michelson interferometer," Opt. Lett. 27, 1147-1149 (2002)

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