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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 30, Iss. 19 — Oct. 1, 2005
  • pp: 2647–2649

Improving the spectral resolution of wedged etalons and linear variable filters with incidence angle

Robert R. McLeod and Tokuyuki Honda  »View Author Affiliations

Optics Letters, Vol. 30, Issue 19, pp. 2647-2649 (2005)

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Compact spectrometers fabricated by placing a wedged etalon or a linear variable filter in front of a linear photodiode array typically do not exhibit the spectral resolution of a parallel filter of the same finesse. A theoretical analysis of the beam emerging from a wedged etalon is shown to predict a comalike aberration, explaining the loss in resolution. This analysis also predicts a focused beam waist whose axial position depends on the incidence angle, indicating that resolution can be improved by placing this waist on the detector. These results are experimentally confirmed in a multicavity linear variable filter to achieve 0.09 nm spectral resolution at 1550 nm.

© 2005 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(300.6190) Spectroscopy : Spectrometers
(310.6860) Thin films : Thin films, optical properties

ToC Category:

Robert R. McLeod and Tokuyuki Honda, "Improving the spectral resolution of wedged etalons and linear variable filters with incidence angle," Opt. Lett. 30, 2647-2649 (2005)

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