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US 8,274,027 B2Granted
Transparent silicon detector and multimode seeker using the detector
AssigneeRaytheon Company
InventorsClarence C. Andressen, Robert C. Anderson
Life of this patent
Estimating the term…
Abstract
A laser energy detector may include at least one photodetector device formed on a semiconductor substrate. The photodetector device may have an active area effective to detect laser energy at a laser wavelength. The active area of the laser energy detector may be substantially transparent for a first wavelength band within an infrared portion of the electromagnetic spectrum.
Claims19
A laser energy detector, comprising:
- a photodetector formed on a semiconductor substrate, the semiconductor substrate having a front side and an opposing back side, the photodetector including an active area effective to detect laser energy within a first wavelength band, wherein the active area of the photodetector is substantially transparent for a second wavelength band within an infrared portion of the electromagnetic spectrum;
- and
- a back-side coating disposed on the back side of the semiconductor substrate at least over the active area, wherein the back-side coating is reflective for the first wavelength band and antireflective for the second wavelength band, the back-side coating including a plurality of alternating layers of a low refractive index material and a high refractive index material, the low refractive index material being one of CeF3 and YbF3 and the high refractive index material being one of ZnS and ZnSe.
A multimode seeker comprising:
- a focal plane array detector to detect electromagnetic energy within a second wavelength band within an infrared portion of the electromagnetic spectrum;
- and
- an imaging optical system that forms an image of a scene on the focal plane array detector;
- and
- a laser energy detector disposed between the imaging optical system and the infrared focal plane array detector, the laser energy detector comprising:
- at least one photodetector formed on a semiconductor substrate, the photodetector having an active area effective to detect laser energy within a first wavelength,
- wherein the active area is substantially transparent for the second wavelength band.
4 more elements
An integrated semi-active laser (SAL) seeker and imaging infrared (IIR) seeker, comprising:
- an optical system that defines essentially the same optical aperture for the SAL seeker and the IIR seeker;
- a infrared focal plane array detector to detect electromagnetic energy within an predetermined wavelength band, the infrared focal plane array detector disposed at an image plane of the optical system;
- and
- a laser energy detector disposed along an optical path between the imaging optical system and the infrared focal plane array detector,
- wherein an active area of the laser energy detector is substantially transparent for the predetermined wavelength band.
2 more elements
Dependencies are inferred from the claim text.