Abstract
A basis is provided for choosing thermooptical parameters V and W1R as the true criteria of
athermal glasses that minimize temperature distortions in space-based objectives.
Previously unpublished results are presented from our studies, involving the calculation of the
spectral and temperature dependences of V and W1R, and a detailed summary is given
of the thermooptical, optical, and operating parameters of Russian and foreign athermal optical
glasses. It is shown that the set of Russian athermal glasses makes it possible to actively
intervene in the process of controlling thermal-wave aberrations and to develop an optical system
for an objective-apochromat that has a high degree of correction of chromatic aberrations
and is nonmisalignable in a variable temperature field. The calculated characteristics are given for
thermally stable long-focus apochromatic objectives developed by the authors that are more
stable against dynamic external actions and have 20-30% higher image quality than apochromats
made from nonathermal glasses. This reduces the requirements on their thermal protection
and mass.
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