Surface relief gratings manufactured by lithographic means being a candidate for VLT MOONS instrument's main dispersers
Date Issued
2018
Author(s)
Harzendorf, Torsten
•
Michaelis, Dirk
•
Flügel-Paul, Thomas
•
•
•
Zeitner, Uwe
Abstract
Surface relief gratings are well-established elements for high power laser applications, e.g. ultra-short pulse compression. A binary submicron period profile, realized by e-beam lithography and reactive ion beam etching in a dielectric material, is utilized for nearly one-hundred percent diffraction efficiency. Because these gratings are manufactured without any replication techniques, a high wave front accuracy and a low stray light background can be achieved. Spectroscopic applications require additional properties, i.e. a larger spectral bandwidth and Off-Littrow operation. We present new approaches for surface relief gratings realized either via multi-level staircase profiles or exploiting sub-wavelength features. The RVS spectrometer grating in ESA's GAIA mission is a prominent example where these techniques are already in use. The current contribution focuses on the results achieved during a pre-development performed for the MOONS instrument intended to operate at VLT.
Coverage
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
All editors
Navarro, Ramón ; Geyl, Roland
Series
Volume
10706
Start page
1070621
Conferenece
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Conferenece place
Austin, Texas, United States
Conferenece date
10-15 June, 2018
Issn Identifier
0277-786X
Ads BibCode
2018SPIE10706E..21H
Rights
open.access
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