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Proceedings Paper

High-frequency photorefractive amplification for ATR applications
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Paper Abstract

Automatic target recognition (ATR) can be accomplished by many methods, including recognition of vibrometric signatures. In many cases, ATR is enhanced by photorefractive amplification, a two-wave mixing effect in which two input beams form a dynamic holographic grating. One of the two beams (the pump) diffracts from that grating into the other (the signal), assuming the characteristics of the signal. When the pump is much stronger than the signal, the diffracted pump becomes a highly amplified signal beam. Traditionally, however, the frequency at which this amplification can be applied is limited to <1/2πτ0, where τ0 is the decay time of the grating in the absence of a pump or signal. We demonstrate that the amplification has no such limit in the case of vibrometry, which measures frequency-modulated, rather than amplitude-modulated, signals. This is shown by constant photorefractive amplification at frequencies up to >700 kHz in Cu:KNSBN, which has τ0 >100 ms (corresponding to a maximum amplification frequency of 1.6 Hz).

Paper Details

Date Published: 24 August 2006
PDF: 8 pages
Proc. SPIE 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII, 63140O (24 August 2006); doi: 10.1117/12.679763
Show Author Affiliations
Russell M. Kurtz, Physical Optics Corp. (United States)
Albert O. Okorogu, Physical Optics Corp. (United States)
Judy Piranian, Physical Optics Corp. (United States)
Gilda Fathi, Physical Optics Corp. (United States)
Kang-Bin Chua, Physical Optics Corp. (United States)
Ranjit D. Pradhan, Physical Optics Corp. (United States)
Thomas C. Forrester, Physical Optics Corp. (United States)
Tomasz P. Jannson, Physical Optics Corp. (United States)

Published in SPIE Proceedings Vol. 6314:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII
Francis T. S. Yu; Ruyan Guo; Shizhuo S. Yin, Editor(s)

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