Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 13: Ultrashort Laser Pulses: Generation II

Q 13.7: Vortrag

Montag, 8. März 2010, 18:00–18:15, F 342

Modelocked Integrated External-Cavity Surface Emitting Laser (MIXSEL) with output power up to 660 mW and repetition rate up to 10 GHz — •Thomas Südmeyer, Benjamin Rudin, Valentin J. Wittwer, Deran J. H. C. Maas, Yohan Barbarin, Matthias Golling, and Ursula Keller — Department of Physics, ETH Zurich, Switzerland.

Modelocked semiconductor disk lasers (also called VECSELs) achieve higher average output power and shorter pulses than any other ultrafast semiconductor laser technology. However, a modelocked VECSEL contains two separate semiconductor elements in a folded cavity, which is a challenge for cost-efficient high volume fabrication, as well as for reaching high repetition rates. Modelocked integrated external-cavity surface emitting lasers (MIXSELs) are a novel type of ultrafast semiconductor lasers. They combine gain and absorber in one semiconductor structure, enabling modelocking in a simple straight cavity and the possibility of a quasi-monolithic design. Here we present a substantially improved MIXSEL. We developed QD saturable absorber with low saturation energy, which allow for an antiresonant design. This relaxes the demands on the growth accuracy and avoids narrow resonances in the dispersion. Wafer removal technology enabled us to achieve 660 mW in 23 ps pulses for a heat sink temperature of 10°C. A higher pulse repetition rate of 10 GHz was achieved at lower output power of 200 mW. In both cases the output power was pump limited. Such performance is highly attractive for large-scale application such as optical clocking.