Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonresinous material only
Patent
1998-10-09
2000-04-04
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonresinous material only
264340, 264346, B29D 1100
Patent
active
060457287
ABSTRACT:
An erosion-resistant, chemically vapor-deposited zinc sulfide window and method of making the same are disclosed. The method includes the step of immersing a chemically vapor-deposited or a hot isostatic pressed, chemically vapor-deposited zinc sulfide body into a liquid comprising gallium, the liquid having a temperature of about 600.degree. C. to about 1000.degree. C., for at least about thirty minutes to form a gallium-doped body. The gallium-doped, chemically vapor-deposited zinc sulfide body according to the invention is one capable of transmitting light having a wavelength in the range of about 300 nanometers to about 15,000 nanometers. Furthermore, the gallium-doped, chemically vapor-deposited zinc sulfide window according to the invention is capable of transmitting light, having a wavelength in the range of about 380 nanometers to about 700 nanometers have been exposed to rain erosion for 20 minutes at 470 miles per hour with a 90.degree. incidence angle, with at least about 150% more efficiency than a non-doped, chemically vapor-deposited zinc sulfide window.
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Chen William W.
Gabelich Stephen A.
Harris Norman H.
Alkov Leonard A.
Derrington James
Lenzen, Jr. Glenn H.
Raufer Colin M.
Raytheon Company
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