Low weight, achromatic, athermal, long wave infrared objective lens
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Mar 14, 1995
filing date -
Mar 14, 1995
priority date (Note) -
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Abstract
A low weight, achromatic, athermal, long wave infrared objective lens with one element having a positive optical power and the other element having a negative optical power but with a higher thermo-optic coefficient than the thermo-optic coefficient of the first element. A diffractive color correcting optical surface is generated on one surface of one of the elements and aspheric surfaces may be included for further performance gains.
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