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Proceedings Paper

Marine Raman image amplification
Author(s): Lonnie K. Calmes; James T. Murray; William Lucas Austin; Richard C. Powell
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Paper Abstract

Lite Cycles has developed a new type of range-gated, LIDAR sensing element based on Raman image amplification in a solid-state optical crystal. Marine Raman Image Amplification (MARIA) is a feasible technology for producing high-resolution imagery in an underwater environment. MARIA is capable of amplifying low-level optical images with gains up to 106 with the addition of only quantum-limited noise. The high gains available from MARIA can compensate for low quantum efficiency detectors. The range-gate of MARIA is controlled by the pulsewidth of the amplifier pump laser and can be made as short as 30 - 100 cm, using pump pulses of 2 - 6.7 nsec FWHM. The use of MARIA in an imaging LIDAR system has been shown to result in higher SNR images throughout a broad range of incident light levels, in contrast to the increasing noise factor occurring with reduced gain in ICCDs. The imaging resolution of MARIA in the marine environment can be superior to images produced by a laser line scan or standard range-gated imaging system. MARIA is also superior in rejecting unwanted sunlight background, further increasing the SNR of images. MARIA has the potential of providing the best overall system resolution and SNR, making it ideal for the identification of mine-like objects, even in bright sunlight conditions.

Paper Details

Date Published: 28 October 1999
PDF: 9 pages
Proc. SPIE 3761, Airborne and In-Water Underwater Imaging, (28 October 1999); doi: 10.1117/12.366484
Show Author Affiliations
Lonnie K. Calmes, Lite Cycles, Inc. (United States)
James T. Murray, Lite Cycles, Inc. (United States)
William Lucas Austin, Lite Cycles, Inc. (United States)
Richard C. Powell, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3761:
Airborne and In-Water Underwater Imaging
Gary D. Gilbert, Editor(s)

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