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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 31, Iss. 10 — Apr. 1, 1992
  • pp: 1588–1596

Multiple reflectors as narrow-band and broadband vacuum ultraviolet filters

Muamer Zukic and Douglas G. Torr  »View Author Affiliations


Applied Optics, Vol. 31, Issue 10, pp. 1588-1596 (1992)
http://dx.doi.org/10.1364/AO.31.001588


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Abstract

We report on the development of a new coating design for applications in the vacuum ultraviolet that yields significantly higher reflectivity over selectable bandwidths. We demonstrate that the concept can be used to fabricate high-performance narrow-band and broadband reflection filters, whose spectral properties can be greatly enhanced by utilizing several of these filters in tandem. For example, we have fabricated a narrow-band filter at the location of the O I 135.6-nm line with a 3.2-nm bandwidth, a peak transmittance of 39.3%, and out-of-band wavelength blocking of better than 10−4 %. The principle of our design approach is to use a combination of high (H) and low (L) refractive-index dielectric pairs so that H + L = λr/2, where H/L < 1. H and L designate the optical thicknesses of high- and low-index film materials. This kind of choice for the high–low ratio reduces the effects of absorption for the H films for which the extinction coefficient in the vacuum ultraviolet is much higher than for the low-index film material MgF2. The reduced absorption of multilayers with H/L < 1 results in a significant increase in reflectivity compared with the classical quarter-wave stack for which H/L = 1.

© 1992 Optical Society of America

History
Original Manuscript: August 17, 1990
Published: April 1, 1992

Citation
Muamer Zukic and Douglas G. Torr, "Multiple reflectors as narrow-band and broadband vacuum ultraviolet filters," Appl. Opt. 31, 1588-1596 (1992)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-31-10-1588

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