Abstract The invention is a window for transmitting infrared radiation for use with infrared systems, such as an infrared laser. In detail, the window comprises a polycrystalline silicon substrate doped with between 1×10 14 and 1×10 16 atoms per cubic centimeter of an n-type impurity. The impurities can be selected from the group consisting of Phosphorus, Arsenic, Antimony, Bismouth and Lithium. To reduce reflection, both sides of the sheet are coated with an antireflection coating. Sheet resistances of less than 25 ohms per square are obtainable while simultaneously providing excellent transmission in the infrared at both room and elevated temperatures. The internal heating produced by coupling the window to a source of electrical power can be used for deicing.
Inventors
👤 Brian W. Baird
👤 Martin Levy
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 15:08
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/02; G02B1/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A window for transmitting light from an infrared system comprising a normally insulating polycrystalline silicon substrate having first and second sides and doped with between 1×10 14 and 1×10 16 atoms per cubic centimeter of an n-type impurity.
Claim 2
Dependent Claim
38 words
A window for transmitting light from an infrared system comprising a normally insulating polycrystalline silicon substrate having first and second sides and doped with between 1×10 14 and 1×10 16 atoms per cubic centimeter of an n-type impurity.
Claim 3
Dependent Claim
25 words
The window as set forth in claim 1 wherein the n-type impurity is selected from the group consisting of Phosphorus, Arsenic, Antimony, Bismouth and Lithium.
Claim 4
Dependent Claim
23 words
The window as set forth in claim 2 wherein the first and second sides of said substrate are coated with an antireflective coating.