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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 27 — Sep. 20, 2008
  • pp: 4878–4883

In-line broadband 270 ° ( 3 λ / 4 ) chevron four-reflection wave retarders

R. M. A. Azzam and H. K. Khanfar  »View Author Affiliations


Applied Optics, Vol. 47, Issue 27, pp. 4878-4883 (2008)
http://dx.doi.org/10.1364/AO.47.004878


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Abstract

The net differential phase shift Δ t introduced between the orthogonal p and s linear polarizations after four successive total internal reflections inside an in-line chevron dual-Fresnel-rhomb retarder is a function of the first internal angle of incidence φ and prism refractive index n. Retardance of 3 λ / 4 (i.e., Δ t = 270 ° ) is achieved with minimum angular sensitivity when φ = 45 ° and n = 1.900822 . Several optical glasses with this refractive index are identified. For Schott glass SF66 the deviation of Δ t from 270 ° is 4 ° over a wave length range of 0.55 λ 1.1 μm in the visible and near-IR spectrum. For a SiC prism, whose totally reflecting surfaces are coated with an optically thick Mg F 2 film, Δ t = 270 ° at two wavelengths: λ 1 = 0.707 μm and λ 2 = 4.129 μm . This coated prism has a maximum retardance error of 5 ° over > three octaves (0.5 to 4.5 μm ) in the visible, near-, and mid-IR spectral range. Another mid-IR 3 λ / 4 retarder uses a Si prism, which is coated by an optically thick silicon oxynitride film of the proper composition, to achieve retardance that differs from 270 ° by < 0.5 ° over the 3 5 μm spectral range.

© 2008 Optical Society of America

OCIS Codes
(160.4670) Materials : Optical materials
(230.5440) Optical devices : Polarization-selective devices
(260.2130) Physical optics : Ellipsometry and polarimetry
(260.3060) Physical optics : Infrared
(260.5430) Physical optics : Polarization
(310.1620) Thin films : Interference coatings

ToC Category:
Optical Devices

History
Original Manuscript: June 25, 2008
Manuscript Accepted: August 10, 2008
Published: September 12, 2008

Citation
R. M. A. Azzam and H. K. Khanfar, "In-line broadband 270° (3λ/4) chevron four-reflection wave retarders," Appl. Opt. 47, 4878-4883 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-27-4878

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