Nd:YAG waveguide laser with 1.3 W output power, fabricated by direct femtosecond laser writing

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2010

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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 μ m was observed. Loss measurements resulted in guiding losses of about 1.6 dB/cm for the double track waveguide. Spectro-scopic investigations of the 4F 3/2 → 4F 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 doubletrack 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 μ m at an outcoupling transmission of 95%. © 2010 Springer-Verlag.

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