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Proceedings Paper

Nanosecond electrical and optical pulses and self phase conjugation from photorefractive lithium niobate fibers and crystals
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Paper Abstract

We have observed nanosecond electrical and optical pulsations from photorefractive lithium-niobate optical fibers using CW green and blue low-power lasers. Fourier spectra of the pulsations have a maximum at ~900 MHz with peaks separated by ~30MHz. We consider free-space and fiber supported illumination of the fiber crystal. Strong nonlinear enhanced backscattering with phase conjugation was observed from bulk crystals and crystal fibers along the C-axis. Model of transformation of CW laser irradiation of ferroelectric crystals into periodic nanosecond electrical and optical pulsations is suggested. This model includes combinations of photorefractive, pyroelectric, piezoelectric, and photogalvanic mechanisms of the holographic grating formation and crystal electrical charging. Possible applications of these short photo-induced electrical pulses for modulation of holographic beam coupling, pulsed electrolysis, electrophoresis, focused electron beams, X-ray and neutron generation, and hand-held micro X-ray devices for localized oncology imaging and treatment based on our advanced sensor work are discussed.

Paper Details

Date Published: 17 September 2007
PDF: 9 pages
Proc. SPIE 6698, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications, 66981Q (17 September 2007); doi: 10.1117/12.752133
Show Author Affiliations
N. Kukhtarev, Alabama A&M Univ. (United States)
T. Kukhtareva, Alabama A&M Univ. (United States)
M. Curley, Alabama A&M Univ. (United States)
H. M. Jaenisch, Alabama A&M Univ. (United States)
Matthew E. Edwards, Alabama A&M Univ. (United States)
M. Gu, The Pennsylvania State Univ. (United States)
Z. Zhou, The Pennsylvania State Univ. (United States)
R. Guo, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 6698:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications
Ruyan Guo; Shizhuo S. Yin; Francis T.S. Yu, Editor(s)

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