Highly efficient lasers and amplifiers in double tungstates

Share/Save/Bookmark

Pollnau, M. and Geskus, D. and Dalfsen, K. van and Garcia Blanco, S.M. and Aravazhi, S. (2011) Highly efficient lasers and amplifiers in double tungstates. In: Joint Annual Meeting of the Swiss Physical Society and the Austrian Physical Society, 15-17 June 2011, Lausanne, Switzerland (pp. Paper 627).

[img] PDF
Restricted to UT campus only
: Request a copy
8kB
Abstract:The double tungstates KY(WO4)2, KGd(WO4)2, and KLu(WO4)2 are excellent candidates for solid-state lasers because of the large transition cross-sections of optically active rare-earth ions doped into these hosts. We grow actively doped KY1-x-yGdxLuy(WO4)2 layers onto KY(WO4)2 substrates by liquid-phase epitaxy. Co-doping the layers with optically inert Gd3+ and Lu3+ ions simultaneously allows for lattice matching and enhanced refractive index contrast with respect to the substrate. Low-loss channel waveguides are microstructured into the layers by Ar+-beam etching, resulting in strong pump- and signal-mode confinement. Yb-doped channel waveguide lasers deliver 650 mW output power at 1 µm. Record-high slope efficiency (85%) and record-low quantum defect (0.7%) for dielectric lasers are achieved. In pump-signal experiments, exploiting highly doped KGd0.447Lu0.078Yb0.475(WO4)2 channel waveguides, we demonstrate a giant optical gain of 950 dB/cm, exceeding the gain previously reported in rare-earth-ion-doped materials by two orders of magnitude and comparable to the gain obtained in semiconductor optical amplifiers.
Item Type:Conference or Workshop Item
Additional information:http://www.sps.ch/uploads/media/2011Programmuebersicht.pdf
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/77564
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page