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

Chen Cheng; J. R. Vázquez de Aldana; Feng Chen

doi:10.1117/12.2185403

14 July 2015 A novel micro-processing of waveguide coupler in birefringent crystal by twin tracks of single-scan femtosecond laser writing

Chen Cheng, J. R. Vázquez de Aldana, Feng Chen

Author Affiliations +

Proceedings Volume 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers; 95321K (2015) https://doi.org/10.1117/12.2185403
Event: Pacific Rim Laser Damage, 2015, Jiading, Shanghai, China

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.

Citation Download Citation

Chen Cheng, J. R. Vázquez de Aldana, and Feng Chen "A novel micro-processing of waveguide coupler in birefringent crystal by twin tracks of single-scan femtosecond laser writing", Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 95321K (14 July 2015); https://doi.org/10.1117/12.2185403

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