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Proceedings Paper

Study of waveguide directly writing in LiNbO3 crystal by high-repetition-rate femtosecond laser
Author(s): Chuan Wu; Feng Jie; Yongjia Yang; Jiangui Mao; Anlin Luo; Zigang Zhou
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Paper Abstract

In this paper, we demonstrate the buried waveguides directly writing in LiNbO3 crystal by a tightly focused femtosecond laser with repetition rate 75MHz, and the femtosecond laser was focused by the microscope objective of which NA is 0.65. Fabricating nine carved paths in LiNbO3 crystal by moving three-dimensional electric translation stage at different speeds varying from 2mm/s to 10mm/s, controlled by a computer. Analyzing the structure of the end face of the directly writing region by laser Raman, which shows the large-scale defects are generated in the center of the etching region, densification induced by the thermal effect of high repetition rate femtosecond laser interaction of LiNbO3 were generated below and down of the center of the etching region. Using a He-Ne laser focused by a microscope objective with NA 0.65 coupling to the end face of the prefabricated nine carved paths, which shows two waveguides are generated in the top and below of the inscribing region. Testing the insert loses of these waveguides with an optical power meter, the result shows that the insert loses of the waveguides fabricated at speed of 8~10mm/s is low to 3dB·cm-1, and the insert loses was low to 1.5 dB·cm-1 when the scanning speed is 9mm/s, moreover, the insert loses of the below region was low to the top region.

Paper Details

Date Published: 4 November 2016
PDF: 8 pages
Proc. SPIE 10027, Nanophotonics and Micro/Nano Optics III, 100271H (4 November 2016); doi: 10.1117/12.2246788
Show Author Affiliations
Chuan Wu, Southwest Univ. of Science and Technology (China)
Feng Jie, Southwest Univ. of Science and Technology (China)
Yongjia Yang, Southwest Univ. of Science and Technology (China)
Jiangui Mao, Southwest Univ. of Science and Technology (China)
Anlin Luo, Southwest Univ. of Science and Technology (China)
Zigang Zhou, Southwest Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10027:
Nanophotonics and Micro/Nano Optics III
Zhiping Zhou; Kazumi Wada, Editor(s)

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