3 March 2014 Femtosecond MIXSEL
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Abstract
The modelocked integrated external-cavity surface emitting laser (MIXSEL) combines the active region and basic layout of vertical-external-cavity surface-emitting lasers (VECSELs) with the saturable absorber of a semiconductor saturable absorber mirror (SESAM) in a single semiconductor layer stack. This concept allows stable and self-starting passive modelocking in a simple straight cavity. Record-high average output power has been demonstrated previously with a MIXSEL based on a quantum dot saturable absorber, but with a minimum pulse duration of only 17 ps up to now. Here we present a femtosecond MIXSEL emitting 620-fs pulses in 101 mW of average output power at 4.8 GHz pulse repetition rate. A novel single quantum well saturable absorber, whose parameters are discussed in detail, enabled the strong reduction in pulse duration by over an order of magnitude.
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M. Mangold, V. J. Wittwer, C. A. Zaugg, S. M. Link, M. Golling, B. W. Tilma, U. Keller, "Femtosecond MIXSEL", Proc. SPIE 8966, Vertical External Cavity Surface Emitting Lasers (VECSELs) IV, 896609 (3 March 2014); doi: 10.1117/12.2037549; https://doi.org/10.1117/12.2037549
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