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The advantages of mirror optics for spectrographic systems are well known, namely, that all wave lengths focus at the same place and that the reflection losses can be made very small. Most modern spectrographs use mirror optics. Some are able to use spherical mirrors while others must
use off-axis paraboloidal mirrors to achieve the desired resolution. Inexpensive concave spherical mirrors are ideal for imaging the source on a spectrograph slit, except for the problem of astigmatism. Expensive off-axis corrected mirrors can be obtained, but they must then be used only at
the designed off-axis angle. We have found a simple adjustable way to reduce the astigmatism from inexpensive spherical mirrors used at moderate off-axis angles.
Los Alamos Scientific Laboratory, Los Alamos' New Mexico 87544
Publication date: January 1, 1973
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)