Design and Fabrication of Lithium Niobate Blue-Laser Directional Couplers
|Keywords:||鈮酸鋰;藍光;方向耦合器;光折效應;LiNbO3;blue laser;directional coupler;photorefractive effect||Issue Date:||2005||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.
|Appears in Collections:||光電工程學研究所|
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