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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 31 — Nov. 1, 1999
  • pp: 6487–6493

Efficiency calibration of the first multilayer-coated holographic ion-etched flight grating for a sounding rocket high-resolution spectrometer

Michael P. Kowalski, Troy W. Barbee, Jr., Klaus F. Heidemann, Herbert Gursky, Jack C. Rife, William R. Hunter, Gilbert G. Fritz, and Raymond G. Cruddace  »View Author Affiliations


Applied Optics, Vol. 38, Issue 31, pp. 6487-6493 (1999)
http://dx.doi.org/10.1364/AO.38.006487


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Abstract

We have fabricated the four flight gratings for a sounding rocket high-resolution spectrometer using a holographic ion-etching technique. The gratings are spherical (4000-mm radius of curvature), large (160 mm × 90 mm), and have a laminar groove profile of high density (3600 grooves/mm). They have been coated with a high-reflectance multilayer of Mo/Si. Using an atomic force microscope, we examined the surface characteristics of the first grating before and after multilayer coating. The average roughness is approximately 3 Å rms after coating. Using synchrotron radiation, we completed an efficiency calibration map over the wavelength range 225–245 Å. At an angle of incidence of 5° and a wavelength of 234 Å, the average efficiency in the first inside order is 10.4 ± 0.5%, and the derived groove efficiency is 34.8 ± 1.6%. These values exceed all previously published results for a high-density grating.

© 1999 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(260.7200) Physical optics : Ultraviolet, extreme
(310.1620) Thin films : Interference coatings
(350.1260) Other areas of optics : Astronomical optics

History
Original Manuscript: May 12, 1999
Revised Manuscript: August 2, 1999
Published: November 1, 1999

Citation
Michael P. Kowalski, Troy W. Barbee, Klaus F. Heidemann, Herbert Gursky, Jack C. Rife, William R. Hunter, Gilbert G. Fritz, and Raymond G. Cruddace, "Efficiency calibration of the first multilayer-coated holographic ion-etched flight grating for a sounding rocket high-resolution spectrometer," Appl. Opt. 38, 6487-6493 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-31-6487


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References

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