Investigation of Domain Wall Velocity to External Fields for High-Quality Waveguide-Type Periodically Poled LiNbO3 Fabrication
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第1期
论文作者：Soo Woo Kwon Woo Kyung Kim H M Lee Yo Seung Song Woo Seok Yang Dae Ho Yoon Hang Yong Lee
Key words：periodically poled lithium niobate; coercive field; duty cycle; domain wall velocity; quasi phase matching;
Abstract: The Ti-doped waveguide-type periodically poled LiNbO3 (PPLN) were fabricated and the dependence of domain wall velocity on an external field applied for domain inversion was investigated. The whole polarization reversal process was computer-controlled to regulate domain wall expansion at a feedback time shorter than 5 μs. The coercive voltage and several values of excess voltage were applied on 500 μm-thick wafers serially connected to a 1-MOhm external resistor which had an effect of the poling current reduction, i.e. the deceleration of domain wall expansion. The domain wall velocity is sensitive to the poling voltage, precisely speaking, to the excess voltage. The domain wall velocities were 28.70, 16.02 and 5.75 μm·s-1 under poling field of 23.5, 22.0 and 21.0 kV·mm-1, respectively. Moreover, average duty cycle of PPLN is about 49.93%.
Soo Woo Kwon1，Woo Kyung Kim2，H M Lee2，Yo Seung Song1，Woo Seok Yang2，Dae Ho Yoon3，Hang Yong Lee2
(1.Department of Materials Engineering, Hankuk Aviation University, Goyang 412-791, Korea;
2.Nano Bio-Photonics Team, Korea Electronics Technology Institute, Bundang 463-816, Korea;
3.Department of Advanced Material Engineering, Sungkyunkwan University, Suwon 440-746, Korea)
Abstract:The Ti-doped waveguide-type periodically poled LiNbO3 (PPLN) were fabricated and the dependence of domain wall velocity on an external field applied for domain inversion was investigated. The whole polarization reversal process was computer-controlled to regulate domain wall expansion at a feedback time shorter than 5 μs. The coercive voltage and several values of excess voltage were applied on 500 μm-thick wafers serially connected to a 1-MOhm external resistor which had an effect of the poling current reduction, i.e. the deceleration of domain wall expansion. The domain wall velocity is sensitive to the poling voltage, precisely speaking, to the excess voltage. The domain wall velocities were 28.70, 16.02 and 5.75 μm·s-1 under poling field of 23.5, 22.0 and 21.0 kV·mm-1, respectively. Moreover, average duty cycle of PPLN is about 49.93%.
Key words:periodically poled lithium niobate; coercive field; duty cycle; domain wall velocity; quasi phase matching;
【全文内容正在添加中】
