Design and Fabrication of Lithium Niobate Blue-Laser Directional Couplers
Date Issued
2005
Date
2005
Author(s)
Chen, Sung-Liang
DOI
zh-TW
Abstract
Because blue laser can now be successfully fabricated and integrated, the range of wavelength in the applications of integrated optics can thus be extended to shorter one. The short-wavelength operation can be applied to optical communication of military affairs. However, the photorefractive effects, which are more remarkable when compared with longer wavelength, will be harmful to the system. Therefore, it is important to fabricate devices that can be operated at blue-laser wavelength and to know the differences when they were once operated at longer wavelength.
In this thesis, Ti-diffused lithium niobate directional coupler has been successfully fabricated using Z-cut substrate and can be operated at blue-laser wavelength with single mode. Besides, lithium out-diffusion is suppressed. The coupling length is 0.694mm at a waveguide width of 2 micrometer and a gap of 2 micrometer. The experimental coupling length is also compared with simulation results, and the former is very close to the later. When measuring the photorefractive effects, the Zn-Ni:LiNbO3 waveguide is found to be more resistant than Ti:LiNbO3 waveguide.
Subjects
鈮酸鋰
藍光
方向耦合器
光折效應
LiNbO3
blue laser
directional coupler
photorefractive effect
Type
thesis
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