High Efficiency Germanium Immersion Gratings

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We have fabricated several germanium immersion gratings by single crystal, single point diamond flycutting on an ultra-precision lathe. Use of a dead sharp tool produces groove corners less than 0.1 micron in radius and consequently high diffraction efficiency. We measured first order efficiencies in immersion of over 80% at 10.6 micron wavelength. Wavefront error was low averaging 0.06 wave rms (at 633 nm) across the full aperture. The grating spectral response was free of ghosts down to our detection limit of 1 part in 10{sup 4}. Scatter should be low based upon the surface roughness. Measurement of the spectral line ... continued below

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Kuzmenko, P J; Davis, P J; Little, S L; Little, L M & Bixler, J V May 1, 2006.

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We have fabricated several germanium immersion gratings by single crystal, single point diamond flycutting on an ultra-precision lathe. Use of a dead sharp tool produces groove corners less than 0.1 micron in radius and consequently high diffraction efficiency. We measured first order efficiencies in immersion of over 80% at 10.6 micron wavelength. Wavefront error was low averaging 0.06 wave rms (at 633 nm) across the full aperture. The grating spectral response was free of ghosts down to our detection limit of 1 part in 10{sup 4}. Scatter should be low based upon the surface roughness. Measurement of the spectral line profile of a CO{sub 2} laser sets an upper bound on total integrated scatter of 0.5%.

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PDF-file: 16 pages; size: 6.4 Mbytes

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  • Presented at: Opto-Mechanical Technologies for Astronomy, Orlando, FL, United States, May 24 - May 31, 2006

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  • Report No.: UCRL-CONF-221103
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 899391
  • Archival Resource Key: ark:/67531/metadc889283

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 3:18 p.m.

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Kuzmenko, P J; Davis, P J; Little, S L; Little, L M & Bixler, J V. High Efficiency Germanium Immersion Gratings, article, May 1, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889283/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.