Applied Physics B

, Volume 100, Issue 1, pp 131–135

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

Authors

    • Institute of Laser-Physics
  • J. Siebenmorgen
    • Institute of Laser-Physics
  • O. Hellmig
    • Institute of Laser-Physics
  • K. Petermann
    • Institute of Laser-Physics
  • G. Huber
    • Institute of Laser-Physics
Article

DOI: 10.1007/s00340-010-3929-6

Cite this article as:
Calmano, T., Siebenmorgen, J., Hellmig, O. et al. Appl. Phys. B (2010) 100: 131. doi:10.1007/s00340-010-3929-6

Abstract

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 μm was observed. Loss measurements resulted in guiding losses of about 1.6 dB/cm for the double track waveguide. Spectroscopic investigations of the 4F3/24F11/2 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 μm at an outcoupling transmission of 95%.

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© Springer-Verlag 2010