1985-03-01
1987-03-31
Henry, Jon W.
350622, G02B 1706, G02B 510
Patent
active
046538801
ABSTRACT:
A reflecting beam splitting objective employing only three mirrors obtains a high reflective efficiency. In one embodiment, the objective contains a small intercepting mirror between primary and secondary mirrors of a Cassegrain mirror arrangement. The position of the intercepting mirror is determined so that the mirror receives an input beam and directs that beam onto a first portion of the secondary mirror without vignetting the beam when it is reflected from the secondary mirror to a first portion of the primary mirror or by cutting off part of the image transmitted from the second portion of the secondary mirror to a focus behind the primary mirror. The objective may use all energy that is input into the objective to image a sample. The objective has demonstrated particular utility in the field of infrared spectroscopy of small samples.
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K. P. Norris, "A Reflecting Microscope for Infra-Red Absorption Measurements", Aug. 1954, Journal of Scientific Instruments, vol. 31, pp. 284-287, London, GB.
Messerschmidt Robert G.
Sting Donald W.
Henry Jon W.
Spectra-Tech Inc.
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