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Applied Optics

Applied Optics


  • Vol. 44, Iss. 22 — Aug. 1, 2005
  • pp: 4666–4670

Millimeter-wave achromatic half-wave plate

Shaul Hanany, Johannes Hubmayr, Bradley R. Johnson, Tomotake Matsumura, Paul Oxley, and Matthew Thibodeau  »View Author Affiliations

Applied Optics, Vol. 44, Issue 22, pp. 4666-4670 (2005)

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We have constructed an achromatic half-wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the optical axes of the middle plate rotated by 50.5 deg with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 ± 1.5%. In contrast, the modulation efficiency of a single sapphire plate of the same thickness was 43 ± 4%. Both results are in close agreement with theoretical predictions. The modulation efficiency of the AHWP was constant as a function of incidence angles between 0 and 15 deg. We discuss design parameters of an AHWP in the context of astrophysical broadband polarimetry at the millimeter wavelength band.

© 2005 Optical Society of America

OCIS Codes
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(230.5440) Optical devices : Polarization-selective devices
(260.5430) Physical optics : Polarization
(350.1260) Other areas of optics : Astronomical optics

Original Manuscript: January 12, 2005
Revised Manuscript: March 20, 2005
Manuscript Accepted: March 21, 2005
Published: August 1, 2005

Shaul Hanany, Johannes Hubmayr, Bradley R. Johnson, Tomotake Matsumura, Paul Oxley, and Matthew Thibodeau, "Millimeter-wave achromatic half-wave plate," Appl. Opt. 44, 4666-4670 (2005)

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