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Objective transmission gratings for large Schmidt telescopes

Strong, John and Zwicky, Fritz (1969) Objective transmission gratings for large Schmidt telescopes. Applied Optics, 8 (5). pp. 1021-1022. ISSN 0003-6935.

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Several lamellar gratings of 18-in. aperture, with 300 diffraction elements per inch, have been made for determining stellar spectra with wide angle telescopes. Central orders are missing at λ4800, and weak at adjacent wavelengths. The two, equal first orders are about 1^m weaker than spectra by a prism or echelette grating. Dispersion is linear. The procedure of manufacture is adaptable to larger size. The wavelength at which the central order is missing can be controlled by varying the lamellae thickness. The lamellae are evaporated strips of quartz of 0.5-µ thickness, covering half the face of the support a spectacle crown, plane parallel plate of ¾-in. thickness. The lamellae were deposited by thermal evaporation.

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Additional Information:© Copyright 1969 Optical Society of America. Received 9 October 1968.
Issue or Number:5
Record Number:CaltechAUTHORS:STROao69
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Official Citation:J. Strong and F. Zwicky, "Objective transmission gratings for large Schmidt telescopes," Appl. Opt. 8, 1021- (1969)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10465
Deposited By: Archive Administrator
Deposited On:07 May 2008
Last Modified:03 Oct 2019 00:09

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