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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 30 — Oct. 20, 1999
  • pp: 6257–6271

High-efficiency dielectric reflection gratings: design, fabrication, and analysis

Karl Hehl, Joerg Bischoff, Ullrich Mohaupt, Martin Palme, Bernd Schnabel, Lutz Wenke, Ragnar Bödefeld, Wolfgang Theobald, Eberhard Welsch, Roland Sauerbrey, and Hartmut Heyer  »View Author Affiliations


Applied Optics, Vol. 38, Issue 30, pp. 6257-6271 (1999)
http://dx.doi.org/10.1364/AO.38.006257


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Abstract

We report on reflection gratings produced entirely of dielectric materials. This gives the opportunity to enhance the laser damage threshold over that occurring in conventional metal gratings used for chirped-pulse-amplification, high-power lasers. The design of the system combines a dielectric mirror and a well-defined corrugated top layer to obtain optimum results. The rules that have to be considered for the design optimization are described. We optimized the parameters of a dielectric grating with a binary structure and theoretically obtained 100% reflectivity for the -1 order in the Littrow mounting for a 45° angle of incidence. Subsequently we fabricated gratings by structuring a low-refractive-index top layer of a multilayer stack with electron-beam lithography. The multilayer system was fabricated by conventional sputtering techniques onto a flat fused-silica substrate. The parameters of the device were measured and controlled by light scatterometer equipment. We measured 97% diffraction efficiency in the -1 order and damage thresholds of 4.4 and 0.18 J/cm2 with 5-ns and 1-ps laser pulses, respectively, at a wavelength of 532 nm in working conditions.

© 1999 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings
(320.0320) Ultrafast optics : Ultrafast optics
(320.5520) Ultrafast optics : Pulse compression

History
Original Manuscript: March 19, 1999
Revised Manuscript: July 22, 1999
Published: October 20, 1999

Citation
Karl Hehl, Joerg Bischoff, Ullrich Mohaupt, Martin Palme, Bernd Schnabel, Lutz Wenke, Ragnar Bödefeld, Wolfgang Theobald, Eberhard Welsch, Roland Sauerbrey, and Hartmut Heyer, "High-efficiency dielectric reflection gratings: design, fabrication, and analysis," Appl. Opt. 38, 6257-6271 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-30-6257

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