Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 70: Semiconductor Lasers I
HL 70.7: Vortrag
Donnerstag, 10. März 2016, 11:30–11:45, H13
SESAMs for mode locking of red-emitting VECSELs — •Roman Bek1, Quynh Duong-Ederer1, Hermann Kahle1, Thomas Schwarzbäck1, Michael Jetter1, Maria A. Cataluna2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Research Centers SCoPE and IQST, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, United Kingdom
Passively mode-locked vertical external-cavity surface-emitting lasers (VECSELs) emitting in the infrared spectral range have first been realized in 2000. These compact pulsed laser sources have excellent properties such as high output power, short pulse duration and a near diffraction-limited beam profile. In the visible spectrum, VECSELs have been mode-locked by semiconductor saturable absorber mirrors (SESAMs) since 2013 with emission wavelengths between 650 nm and 675 nm.
We present and compare different SESAM designs for mode locking of AlGaInP VECSELs. Our samples are fabricated by metal-organic vapor-phase epitaxy and include Bragg mirrors consisting of AlGaAs/AlAs on GaAs substrates. The active regions contain either GaInP quantum wells or InP quantum dots embedded in AlGaInP barrier layers. Some of the absorber structures are coated with a fused silica layer to improve the mode locking performance. We use v-shaped cavity configurations with the outcoupling mirror used as folding mirror to strongly focus onto the absorber.