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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1725–1730

Restoration of absolute diffraction efficiency and blaze angle of carbon contaminated gratings by ultraviolet cleaning

Mukund Kumar, Mohd. Hussain Modi, Himanshu Singhal, S. Sendhil Raja, Juzer Ali Chakera, Raj Kumar Gupta, Prasad Anant Naik, Gyanendra Singh Lodha, and Parshotam Dass Gupta  »View Author Affiliations


Applied Optics, Vol. 52, Issue 8, pp. 1725-1730 (2013)
http://dx.doi.org/10.1364/AO.52.001725


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Abstract

An UV cleaning technique has been used for the removal of carbon contamination from grating surface, using oxygen free-radicals generated by the absorption of UV radiation (172 nm) in atmospheric oxygen. The extent of restoration of absolute diffraction efficiency (ADE) and grating blaze angle of a carbon-contaminated variable line–spaced concave grating (average line spacing of 1200lines/mm, blaze angle 3.2 deg, and blaze wavelength 10 nm) has been studied over a 5–70 nm wavelength range. The contamination (due to prolonged use in extreme-ultraviolet spectrograph) resulted in a drastic reduction in the diffraction efficiency of grating, along with a change in the blaze angle. The UV cleaning led to the restoration of blaze angle as well as to an increase in the ADE by more than an order of magnitude for the first two diffraction orders (i.e., from 0.2 to 7.2%) for the first diffraction order and 0.1 to 5% for the second diffraction order at the blaze wavelength. The study is useful for the restoration of carbon-contaminated costly optics.

© 2013 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6700) Optics at surfaces : Surfaces

ToC Category:
Diffraction and Gratings

History
Original Manuscript: November 1, 2012
Revised Manuscript: January 22, 2013
Manuscript Accepted: January 23, 2013
Published: March 8, 2013

Citation
Mukund Kumar, Mohd. Hussain Modi, Himanshu Singhal, S. Sendhil Raja, Juzer Ali Chakera, Raj Kumar Gupta, Prasad Anant Naik, Gyanendra Singh Lodha, and Parshotam Dass Gupta, "Restoration of absolute diffraction efficiency and blaze angle of carbon contaminated gratings by ultraviolet cleaning," Appl. Opt. 52, 1725-1730 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-8-1725

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