The immersed echelle - I. Basic properties

Details The immersed echelle - I. Basic properties The immersed echelle - I. Basic properties

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.302..139s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 302, Issue 1, pp. 139-144.

Astronomy and Astrophysics

Astronomy

3

Scientific paper

High-resolution spectrographs for very large telescopes lead to new challenges in grating technology to achieve optimum matching of the slit width to the seeing disc. This has led elsewhere to the development of long echelles of high blaze angle produced by mosaicking technology. An alternative approach, pursued in this paper and adopted for the Gemini High-Resolution Optical Spectrograph, is to immerse a monolithic echelle in a medium of refractive index greater than unity. This paper explores the consequences of this. It will be followed by Paper II, which will report on a major technology development programme in progress.

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