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Femtosecond-Laser Written Highly Doped Yb(15%):YAG Ceramic Waveguide Laser

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Using the direct femtosecond-laser writing technique tracks of modified material were written in an Yb(15%):YAG ceramic. Due to a stress-induced change of the refractive index between two parallel tracks waveguiding was achieved in channels between the tracks. Laser oscillation of these channel waveguides at a wavelength of 1030 nm was demonstrated with a maximum output power of 0.7 W. The investigation of two different outcoupling transmissions of 99% and 91% revealed, that for the higher outcoupling transmission the slope efficiency is with 35% much lower than for the outcoupling transmission of 91% with a slope efficiency of 65%. This effect may be explained by inversion dependent loss mechanisms.

© 2011 Optical Society of America

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