Patent ID: 6943336

Claim:
An optical window assembly comprising: (a) an outer window; (b) an inner window; (c) a housing, wherein said outer window and said inner window are mounted, said housing holding said outer window and said inner window apart, thereby forming an intervening space between said outer window and said inner window; (d) a coolant occupying said intervening space; and (e) a mechanism for cooling said coolant: wherein said outer window includes an outer surface facing away from said inner window and an inner surface facing towards said inner window, wherein said inner window includes an outer surface facing towards said outer window and an inner surface facing away from said outer window, and wherein said inner surface of said inner window is coated with an optical coating that is substantially transparent in at least one wavelength band selected from the group consisting of visible wavelength bands and infrared wavelength bands and that is substantially opaque to electromagnetic radiation of radio and radar frequencies.