Infrared upconversion as a means of seeing in the dark

Details Infrared upconversion as a means of seeing in the dark Infrared upconversion as a means of seeing in the dark

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975opscn...9....9g&link_type=abstract

Optical Sciences Center Newsletter, vol. 9, May 1975, p. 9-12. USAF-NASA-sponsored research.

Physics

Optics

Crystal Optics, Image Converters, Infrared Radiation, Night Vision, Nonlinear Optics, Astronomical Spectroscopy, Imaging Techniques, Integrated Circuits, Laser Applications, Lithium Compounds, Optical Waveguides, Parametric Frequency Converters, Photons, Rectangular Waveguides, Technological Forecasting

Scientific paper

A new approach to seeing in the dark is described which is based on the principles of nonlinear optics employing a crystal such as lithium iodate. A nonlinear optical device capable of producing photons at higher frequencies from lower-frequency incident light is shown to upconvert infrared light directly into visible light. The major advantages of the infrared upconversion process is that it permits the infrared signal to be detected by photon-counting devices presently available for the visible spectral region, and that it can provide sensitivity to infrared radiation without the need for cryogenic cooling of the detector used. Early works on infrared upconversion are reviewed. The development of applications is discussed as to astronomical spectroscopy and infrared image upconversion involving either angular or positional resolution elements. The demonstration of infrared upconversion in rectangular waveguides of single-crystal GaAs by Anderson et al. (1971) indicates future possibilities in upconversion by the use of integrated optics devices.

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