Accession Number : AD0715339

Title :   Applications of Optical Parametric Upconversion to IR Viewing Systems,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Andrews,R. A.

Report Date : 13 OCT 1970

Pagination or Media Count : 12

Abstract : The use of parametric upconversion to convert IR images to the visible has been demonstrated by several investigators. This technique has possible application in real-time systems with IR active viewing, and also as a means of producing IR holograms for recording three-dimensional information. For these applications, special consideration must be given to resolution, conversion efficiency, laser pump and illuminator powers, image identification, atmospheric transmission, and nonlinear materials. Resolution is determined by the optical system employed, and it is a function of the mode structure of the pump radiation and the size of the nonlinear crystal. Conversion efficiency depends on the mode of operation, which in turn determines peak pump intensity. Available nonlinear materials and lasers currently limit the design of a practical system to a few optimum combinations. Image identification is a problem of object reflectivity, both spectral and diffuse, in the IR operating range, which is limited by atmospheric transmission. Considering all these factors, an IR viewing system is possible employing a Nd:YAG laser, HIO3, and low-light-level TV. (Author)

Descriptors :   (*INFRARED IMAGES, *IMAGE CONVERTERS), INFRARED LASERS, VISUAL SIGNALS, PHOTOMULTIPLIER TUBES, IMAGE INTENSIFIERS(ELECTRONICS)

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE