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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 29 — Oct. 10, 2005
  • pp: 6123–6130

Reduction of polarization-induced artifacts in grating-based spectrometers

Kiang Wei Kho, Paul R. Stoddart, Gavan Rosman, Martin Harris, and Alex Mazzolini  »View Author Affiliations

Applied Optics, Vol. 44, Issue 29, pp. 6123-6130 (2005)

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An optical device that converts unpolarized light into a single polarization state is described. The device is based on a polarizing beam splitter that separates the two polarization directions. The beam splitter is combined with two pairs of equilateral prisms that are used to collimate the two beams in terms of both propagation and polarization directions. When it is used in combination with a blazed diffraction grating, this device is shown to effectively remove the polarization dependence of the first-order diffracted power. The device has an insertion loss of approximately 14% for purely s-polarized light. However, for unpolarized light incident upon the two gratings studied here, the increased throughput of the p-polarized component leads to an average relative gain in overall efficiency of 13%–19%, depending on the grating. In collimating the two polarization directions, the device may cause a reduction in spectral resolution for a rectangular entrance slit. As a result, the device is more likely to find use in spectrometers that have a circular aperture, such as that provided by an optical fiber.

© 2005 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.1360) Optical devices : Beam splitters
(260.5430) Physical optics : Polarization
(300.6190) Spectroscopy : Spectrometers

ToC Category:
Optical Devices

Original Manuscript: February 15, 2005
Revised Manuscript: June 3, 2005
Manuscript Accepted: June 20, 2005
Published: October 10, 2005

Kiang Wei Kho, Paul R. Stoddart, Gavan Rosman, Martin Harris, and Alex Mazzolini, "Reduction of polarization-induced artifacts in grating-based spectrometers," Appl. Opt. 44, 6123-6130 (2005)

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