High-Resolution Optical Upconverter.
OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C
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The invention relates to image converters and the like and more particularly to optical upconverters using nonlinear optical materials. In the fields of thermography, night surveillance, night communication, etc., it has been the general practice to employ devices such as image converters for the purpose of converting infrared images into visible images. The optical upconverter shifts the frequency of the object beam into the visible light region, by mixing the object beam and a pump beam in a nonlinear optical material. The invention contemplates a unique arrangement of elements, whereby the angle between the wavevectors of the pump beam and the object beam are minimized.
- Infrared Detection and Detectors