Physics – Optics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apopt..20.3327k&link_type=abstract
Applied Optics, vol. 20, Oct. 1, 1981, p. 3327-3331.
Physics
Optics
9
Echelle Gratings, Gratings (Spectra), Holography, Light Scattering, Spectral Line Width, Spectral Resolution, Transmission Efficiency, Absorption Spectra, Hyperfine Structure, Line Shape, Mercury Vapor, Pressure Broadening
Scientific paper
An echelle grating with 316 grooves/mm and a 63 deg blaze angle is compared with a 3600-groove/mm holographic grating. The scattered light and resolution of the 10- x 20-cm gratings are photoelectrically evaluated in a 3-m spectrometer optimized to eliminate coma and baffled to minimize instrumental scattered light. Both gratings are ghost-free, but the holographic grating has substantially lower scattered light for test lines near 4000 A and yields improved stray light rejection within absorption lines. It also exhibits slightly higher resolution. The throughput of the spectrometer with the holographic grating is about five times higher than the equivalent combination of spectrometer, echelle grating, and predisperser.
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