Compact high-resolution IR spectrometer for the Columbus Telescope

Details Compact high-resolution IR spectrometer for the Columbus Telescope Compact high-resolution IR spectrometer for the Columbus Telescope

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1946..482w&link_type=abstract

Proc. SPIE Vol. 1946, p. 482-489, Infrared Detectors and Instrumentation, Albert M. Fowler; Ed.

Physics

Optics

37

Scientific paper

An infrared, cryogenically-cooled, grating spectrometer has been designed for the Columbus Project (2 X 8.4-m telescopes) and MMT Conversion (6.5-m). On one barrel of the Columbus Telescope and using a NICMOS3 array of 256 X 256 40 micrometers HgCdTe detectors, the instrument will project each pixel to 0.33 arcsec. With a slit of 0.66 arcsec width (2 pixels), the available spectral resolutions will range from (lambda) /(Delta) (lambda) equals 670 to 19,000. The optics are achromatic from 1.4 to 5 micrometers , allowing use of a variety of array types. The first version of this instrument has been built and fitted with optics that allow its use with the Steward Observatory 1.5-m and 2.3-m telescopes. It is relatively inexpensive (< $DOL400 K) and compact (approximately 0.3 m(superscript 3)). The high spectral resolution in such a compact instrument will be achieved through an echelle grating immersed in silicon. We discuss the processing for producing such gratings, including demonstrations that we have conducted on test blanks. We report on the preliminary performance of the prototype instrument and on unique design features that may be useful for other spectrometers.

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