Narrow Angle, Narrow Bandwidth Optical Receiver System.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A narrow angle, narrow bandwidth optical receiver system for detecting light rays reflected from a predetermined area illuminated by a laser beam having a known wavelength. A large collecting lens having a small field of view receives incoming reflected rays which are collimated by a pair of relay lenses having a narrow bandwidth, triple cavity, single element interference filter positioned therebetween. The filtered rays are processed by a photomultiplier tube and a CRT display to illustrate signals of interest within the illuminated area. An alternate embodiment provides a cone element to receive filtered rays from relay lenses for decreasing the size of the receiver system. Author
- Lasers and Masers