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15 February 2008 Structural modifications in Er-Yb doped phosphate glass induced by femtosecond laser waveguide writing
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Abstract
We have systematically studied femtosecond-laser fabrication of optical waveguides in an Er-Yb doped phosphate glass. Waveguides were written using the IMRA America FCPA μJewel D-400 femtosecond fiber laser system with pulse repetition rates ranging from 250 kHz to 2.2 MHz. At every pulse repetition rate a series of waveguides was written while varying scan speeds from 50 μm/s to 100 mm/s and pulse energies from 80 nJ to 320 nJ. The optical quality of the waveguides was evaluated by measuring the waveguide mode profile as well as the optical loss. Laser-induced defects and structural changes in the glass were characterized using confocal fluorescence and Raman microscopy.
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L. B. Fletcher, J. J. Witcher, W. J. Reichman, J. Bovatsek, A. Arai, and D. M. Krol "Structural modifications in Er-Yb doped phosphate glass induced by femtosecond laser waveguide writing", Proc. SPIE 6881, Commercial and Biomedical Applications of Ultrafast Lasers VIII, 688111 (15 February 2008); https://doi.org/10.1117/12.763982
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