Paper
14 July 2015 A novel micro-processing of waveguide coupler in birefringent crystal by twin tracks of single-scan femtosecond laser writing
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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Cited by 1 scholarly publication.
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KEYWORDS
Waveguides

Crystals

Laser crystals

Femtosecond phenomena

Polarization

Cladding

Continuous wave operation

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