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Single transverse mode Ti:sapphire rib waveguide laser
C.Grivas, D.P.Shepherd, T.C.May-Smith, R.W.Eason, M.Pollnau*
Optoelectronics Research center, University of Southampton, UK
* Advanced Photonics Laboratory, Institute of Imaging and Applied Optics, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland.
Laser operation of Ti:sapphire rib waveguides fabricated using photolithography and ion beam etching in pulsed laser deposited layers is reported. Polarized laser emission was observed at 792.5 nm with an absorbed pump power threshold of 265 mW, which is more than a factor of 2 lower in comparison to their planar counterparts. Measured beam propagation factors M2x and M2y of 1.3 and 1.2, respectively, indicated single-transverse-mode emission. A quasi-cw output power of 27 mW for an absorbed pump power of 1W and a slope efficiency of 5.3% were obtained using an output coupler of 4.6% transmission with a pump duty cycle of 8%.
Optics Express (2005) Vol.30 pp.210-215
Copyright University of Southampton 2006