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Title: High Efficiency Germanium Immersion Gratings

Abstract

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%.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
899391
Report Number(s):
UCRL-CONF-221103
TRN: US200708%%265
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Opto-Mechanical Technologies for Astronomy, Orlando, FL, United States, May 24 - May 31, 2006
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASTRONOMY; DIAMONDS; DIFFRACTION; EFFICIENCY; GERMANIUM; LASERS; MONOCRYSTALS; ROUGHNESS; SENSITIVITY; SPECTRAL RESPONSE

Citation Formats

Kuzmenko, P J, Davis, P J, Little, S L, Little, L M, and Bixler, J V. High Efficiency Germanium Immersion Gratings. United States: N. p., 2006. Web.
Kuzmenko, P J, Davis, P J, Little, S L, Little, L M, & Bixler, J V. High Efficiency Germanium Immersion Gratings. United States.
Kuzmenko, P J, Davis, P J, Little, S L, Little, L M, and Bixler, J V. Mon . "High Efficiency Germanium Immersion Gratings". United States. doi:. https://www.osti.gov/servlets/purl/899391.
@article{osti_899391,
title = {High Efficiency Germanium Immersion Gratings},
author = {Kuzmenko, P J and Davis, P J and Little, S L and Little, L M and Bixler, J V},
abstractNote = {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%.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}

Conference:
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