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Proceedings Paper

Voltage pulsations in photogalvanic crystals as power supply for EO-modulator
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Paper Abstract

We have developed the all-optical EO-modulator using a pulsed photogalvanic power supply driven by light illumination (coherent and incoherent). Generated by ferroelectric crystal with the photogalvanic effect (Fe-doped LiNbO3), electrical pulses were used for driving a standard EO-modulator, based on transversal EO effect in Bi12SiO20 (BSO) crystals. Both parallel and serial connections of photogalvanic crystal (LN), BSO and oscilloscope were tested. The depth of EO-modulation was very sensitive to the impedance of the connected cables, which implies the existence of transmission-line resonances. Secondly, a more compact version of EO self-modulation is realized with green (wavelength λ=532 nm, P=100mW) solid-state CW laser. In this case, reflection of the CW laser from the LN crystal was modulated in time. Pulsating optical reflection was correlated with the pulsating electrical signals. We report both modes of operation: (1) as pulsed high-voltage power supply, and (2) as compact-pulsed optical modulator. We have described these pulsations using model of photogalvanic effect and ferroelectric emission.

Paper Details

Date Published: 25 June 2004
PDF: 9 pages
Proc. SPIE 5363, Emerging Optoelectronic Applications, (25 June 2004); doi: 10.1117/12.529671
Show Author Affiliations
Matthew E. Edwards, Alabama A&M Univ. (United States)
Nickolai Kukhtarev, Alabama A&M Univ. (United States)
Tatiana Kukhtareva, Alabama A&M Univ. (United States)
Jai-Ching Wang, Alabama A&M Univ. (United States)
Mekonen Bayssie, Alabama A&M Univ. (United States)
Sergei F. Lyuksyutov, Univ. of Akron (United States)
Micheal A. Reagan, Univ. of Akron (United States)

Published in SPIE Proceedings Vol. 5363:
Emerging Optoelectronic Applications
Ghassan E. Jabbour; Juha T. Rantala, Editor(s)

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