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Proceedings Paper

Infrared Imaging Using Nonlinear Optical Upconversion
Author(s): Kamala S. Krishnan; John S. Ostrem; Eddie A. Stappaerts
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Paper Abstract

This paper presents the phenomenology of different approaches to the frequency-shifting (upconversion) of infrared radiation into the visible and discusses the practical aspects of designing systems to up-convert IR images. The recently discovered process of upconverting infrared radiation into the visible or the ultraviolet using two-photon-pumped alkali-metal vapors and the more familiar method of frequency-mixing using single-photon-pumped nonlinear crystals are described and compared. In addition to these coherent processes, the use of quantum-counter action in certain crystals to convert an IR photon into a visible photon by an incoherent process is discussed. The important performance parameters of an IR imaging system are briefly discussed and the considerations and constraints involved in the design of coherent and incoherent image upconverter systems are presented. Using this background, practical system designs are developed for both active and passive imaging. The expected performances of these systems are compared with those of IR imaging systems based on direct-detection of IR photons with semiconductor detectors.

Paper Details

Date Published: 20 October 1977
PDF: 9 pages
Proc. SPIE 0122, Advances in Laser Engineering I, (20 October 1977); doi: 10.1117/12.955787
Show Author Affiliations
Kamala S. Krishnan, Systems Control, Inc. (United States)
John S. Ostrem, SRI International (United States)
Eddie A. Stappaerts, Northrop Corporation (United States)

Published in SPIE Proceedings Vol. 0122:
Advances in Laser Engineering I
Malcolm L. Stitch; Eric J. Woodbury, Editor(s)

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