Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 64: Poster II
HL 64.18: Poster
Thursday, March 19, 2020, 10:00–13:00, P1A
Ultrashort dynamics of an InP/AlGaInP QD SESAM — •Marius Großmann1, Julian Obermeier2, Roman Bek3, Thorsten Schumacher2, Markus Lippitz2, Michael Jetter1, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and Research Center SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Department of Physics, University of Bayreuth, 95440 Bayreuth, Germany — 3Twenty-One Semiconductors, Kiefernweg 4, 72654 Neckartenzlingen, Germany
Mode-locked vertical external-cavity surface-emitting lasers (VECSELs) provide ultrashort pulses across a wide wavelength range. Furthermore, semiconductor bandgap engineering allows the additional flexibility to custom-tailor the pulse train properties.
To this end quantum dots (QDs) are a key component because their 0D-nature contributes beneficial properties when employed in a semiconductor saturable absorber mirror (SESAM). These include independently adjustable saturation fluence and modulation depth as well as a fast relaxation, all advantageous for mode locking of VECSELs.
In this contribution we present the ultrafast properties of an InP/AlGaInP QD SESAM investigated via degenerate pump-probe spectroscopy in the red spectral range.