주기적으로 분극 반전된 MgO:LiNbO3를 이용한 리지형 광도파로 파장가변 소자 제작 및 특성
Fabrication and Characterization of Wavelength Conversion Device with Periodically Poled Ridge-type Waveguide in MgO:LiNbO3
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MgO가 첨가된 z-cut LiNbO3를 이용하여 주기적으로 분극반전된 리지광도파로(Ridge-type Waveguide)를 제작하였으며 이를 적용 하여 녹색광원 소자를 구현시 리지광도파로 높이 변화량과 분극반전주기비 변화량에 따른 이론적 결과와 실험적 결과를 비교 분석하 였다. 이러한 비교분석을 위해 새로운 측정시스템을 구성하였으며, 이를 적용한 소자 측정 결과 중심파장은 1067.45 nm, 파장변환효 율은 90.7%/Wcm2 및 파장변환효율곡선의 반치폭은 0.17 nm임을 확인하였다. 또한, 실험값과 이론값과의 비교결과 분극반전주기와 파장변환효율곡선의 반치폭 계산 오차는 각각 0.016 μm와 0.01 nm로 이론값이 실험값을 잘 예측함을 확인하였다.
Abstract
Wavelength converting devices with a ridge-type waveguide in periodically poled MgO:LiNbO3 are made and characterized. The experimental results are compared with theoretical analysis on the effects of waveguide dimension and duty ratio of the periodically poled structure. To show the relationship of the conversion efficiency to those factors, a new measurement system is configured. That experimental results show that the center wavelength, normalized conversion efficiency and full width half maximum of the conversion efficiency curve are 1067.45 nm, 90.7%/Wcm2 and 0.17 nm, respectively. Also, the estimated results of the duty period and full width half maximum of the conversion efficiency from theoretical calculations agreed well with experimental results with the errors of 0.016 μm and 0.01 nm.
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