Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 100, Issue 1, Pages 131-135Publisher
SPRINGER
DOI: 10.1007/s00340-010-3929-6
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Funding
- Deutsche Forschungsgemeinschaft [1355]
- Joachim Herz Stiftung
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Tracks of modified material were written with femtosecond-laser pulses in neodymium-doped YAG crystals. Due to a stress-induced change of the refractive index, waveguiding beside the tracks and between two adjacent tracks with a distance of approximately 25 mu m was observed. Loss measurements resulted in guiding losses of about 1.6 dB/cm for the double track waveguide. Spectroscopic investigations of the (4) F (3/2)->(4) F (11/2) transmission lines of the neodymium ions, which are close to the modified region, revealed a small stress-induced red shift of the lines. Laser oscillation of single-track waveguides and double-track waveguides was demonstrated with Ti:Sapphire laser pumping at a wavelength of 808 nm. Best laser performance with about 1.3 W output power at 2.25 W launched pump power was achieved using a double-track waveguide with a separation of 27 mu m at an outcoupling transmission of 95%.
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