Abstract

Critical resolution tests were made near limiting geometric incidence angles on a 7.25-in. wide 300-grooves per mm Bausch & Lomb grating. The importance of double passing a grating to increase the available resolving power is discussed and exhibited by reproductions of the hyperfine structure of Hg λ4358, λ5461, λ15 295. A photograph of a reversal in Hg λ4358 presents a resolving power well in excess of 1 000 000 which far exceeds the grazing incidence resolving power of the grating used single pass. An analysis of the hyperfine structure of Hg λ15 295 is given. A discussion of ghost intensities in going from single pass to double pass is also presented. Maximal performance at 4 widely separated wavelengths is given.

© 1957 Optical Society of America

Performance of an Eight-Inch Babcock Grating in a Large Vacuum Spectrograph

A. Keith Pierce
J. Opt. Soc. Am. 47(1) 6-14 (1957)

Hyperfine Structures of Some Hg I Lines*

D. H. Rank, George Skorinko, D. P. Eastman, G. D. Saksena, T. K. McCubbin, and T. A. Wiggins
J. Opt. Soc. Am. 50(11) 1045-1052 (1960)

Ruling of Large Diffraction Gratings with Interferometric Control*

George R. Harrison, Neville Sturgis, Stanley C. Baker, and George W. Stroke
J. Opt. Soc. Am. 47(1) 15-22 (1957)

Infrared Spectroscopy from 5 to 200 Microns with a Small Grating Spectrometer*

R. C. Lord and T. K. McCubbin
J. Opt. Soc. Am. 47(8) 689-697 (1957)

Infrared Grating Spectrophotometer

J. U. White, N. L. Alpert, A. G. Debell, and R. M. Chapman
J. Opt. Soc. Am. 47(5) 358-367 (1957)