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Proceedings Paper

A novel micro-processing of waveguide coupler in birefringent crystal by twin tracks of single-scan femtosecond laser writing
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Paper Abstract

Through a novel micro-processing mechanism in birefringent crystals proposed in this work, a coupler containing twin depressed cladding waveguides have been achieved in Nd:GdVO4 laser crystals. By employing single-scan of femtosecond laser writing, twin tracks with different depths separated by a distance of 70μm were produced due to the birefringence of Nd:GdVO4 crystal. The adjacent 30μm-diameter cladding waveguides, which consist of a 2×2 coupler with a separation of 70μm in a 4-mm-long crystal sample, were inscribed simultaneously. The ratio of output power division from both waveguides was approximately 10.5:1 at 633nm. Continuous-wave lasing was realized in the waveguide coupler platform under the direct optical pump at 808nm. This work indicates a great potential for femtosecond laser inscribed symmetry structures such as waveguide couplers in birefringent crystals based on the proposed micro-processing mechanism.

Paper Details

Date Published: 14 July 2015
PDF: 6 pages
Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 95321K (14 July 2015); doi: 10.1117/12.2185403
Show Author Affiliations
Chen Cheng, Shandong Univ. (China)
J. R. Vázquez de Aldana, Univ. de Salamanca (Spain)
Feng Chen, Shandong Univ. (China)

Published in SPIE Proceedings Vol. 9532:
Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph; Meiping Zhu, Editor(s)

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