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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 13 — May. 1, 2002
  • pp: 2508–2513

Absolute refractive indices and thermal coefficients of CaF2, SrF2, BaF2, and LiF near 157 nm

John H. Burnett, Rajeev Gupta, and Ulf Griesmann  »View Author Affiliations


Applied Optics, Vol. 41, Issue 13, pp. 2508-2513 (2002)
http://dx.doi.org/10.1364/AO.41.002508


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Abstract

We present high-accuracy measurements for wavelengths near 157 nm of the absolute index of refraction, the index dispersion, and the temperature dependence of the index for the ultraviolet optical materials with cubic symmetry: CaF2, SrF2, BaF2, and LiF. Accurate values of these quantities for these materials are needed for designs of the lens systems for F2 excimer-laser-based exposure tools for 157-nm photolithography. These tools are expected to use CaF2 as the primary optical material and possibly one of the others to correct for chromatic aberrations. These optical properties were measured by the minimum deviation method. Absolute refractive indices were obtained with an absolute accuracy of 5 × 10-6 to 6 × 10-6.

© 2002 Optical Society of America

OCIS Codes
(120.5710) Instrumentation, measurement, and metrology : Refraction
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties

History
Original Manuscript: November 20, 2001
Revised Manuscript: January 23, 2002
Published: May 1, 2002

Citation
John H. Burnett, Rajeev Gupta, and Ulf Griesmann, "Absolute refractive indices and thermal coefficients of CaF2, SrF2, BaF2, and LiF near 157 nm," Appl. Opt. 41, 2508-2513 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-13-2508


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