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14 February 2012 High-average power femtosecond VECSELs with tunable repetition rates up to 10 GHz
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We present high average power femtosecond VECSELs based on both quantum dot (QD) and quantum well (QW) gain with extremely low dispersion. 1.05 W in 784-fs pulses could be achieved from a QD-VECSEL modelocked by a QDSESAM with fast recovery dynamics. A similar QW-gain structure modelocked by the same SESAM enabled stable 480-fs with an average output power of 300 mW at a repetition rate of 7 GHz. Furthermore, we investigated repetition rate scaling by changing the cavity length. We demonstrated fundamentally modelocked pulses over a tuning range from 6.5 GHz to 11.3 GHz. Without any realignment of the cavity over the whole tuning range, the pulse duration remained nearly constant around 625 fs (±3.5%) while the output power was 169 mW (±6%). The center wavelength changed only about ±0.2 nm around 963.8 nm. A tunable repetition rate can be of interest for various metrology application such as optical sampling by laser cavity tuning.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
O. D. Sieber, V. J. Wittwer, M. Hoffmann, I. L. Krestnikov, S. S. Mikhrin, D. A. Livshits, M. Golling, T. Südmeyer, and U. Keller "High-average power femtosecond VECSELs with tunable repetition rates up to 10 GHz", Proc. SPIE 8242, Vertical External Cavity Surface Emitting Lasers (VECSELs) II, 824210 (14 February 2012);


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