Please use this identifier to cite or link to this item: https://doi.org/10.1117/12.528712
Title: Refractive index change in lithium niobate induced by focused femtosecond laser
Authors: Gui, L.
Xu, B.
Wu, D.
Goh, Y.W.
Chong, T.C. 
Keywords: Femtosecond laser pulses
Lithium Niobate
Optical waveguide
Refractive index change
Issue Date: 2004
Source: Gui, L., Xu, B., Wu, D., Goh, Y.W., Chong, T.C. (2004). Refractive index change in lithium niobate induced by focused femtosecond laser. Proceedings of SPIE - The International Society for Optical Engineering 5355 : 22-32. ScholarBank@NUS Repository. https://doi.org/10.1117/12.528712
Abstract: Lithium Niobate is an important material in optical communication due to its special characteristics (high electrooptic coefficients and high optical transparency in the near infrared wavelengths). In this paper, we investigated the effects of 775-nm, femtosecond laser radiation on the Lithium Niobate crystal. By focusing the laser beam through a microscope objective, a certain refractive index change may be induced in Lithium Niobate substrate. Based on this effect, channel waveguides and other waveguide structures were fabricated. The output optical fields through them were measured, and the refractive index change of ∼6×10 -4 was calculated with the Near-field Method. The properties of these waveguide structures were discussed. We also investigated the waveguides effect induced with different fabrication conditions. The experimental results revealed that different fabrication conditions affect the waveguide effect greatly.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/84131
ISSN: 0277786X
DOI: 10.1117/12.528712
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