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HL: Fachverband Halbleiterphysik

HL 3: Semiconductor lasers and Photonic crystals

HL 3.5: Vortrag

Montag, 1. April 2019, 10:30–10:45, H33

Investigation of Red-Emitting Mode-Locked VECSELs — •Philipp Tatar-Mathes, Marius Großmann, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart

Since the first realization of mode-locked vertical external-cavity surface-emitting lasers (VECSELs) in 2000, huge development especially in the infrared spectral range was initiated. These systems generate ultrashort pulses with high output powers and a near diffraction-limited beam profile, beneficial properties over a wide wavelength range. Semiconductor structures with an active region containing GaInP/AlGaInP quantum wells, grown on top of AlAs/AlGaAs DBR demonstrate as well excellent performances of VECSELs but in the visible spectral range [1].

We present a VECSEL configuration with emission in the red spectral range from a cavity optimized for high average powers and GHz repetition rates. We interpret the measurements in light of the recently demonstrated self-mode-locking [2] which allows the absence of a SESAM. Therefore, intrinsic nonsaturable losses can be overcome. Our current research focus is capturing the dynamics of pulsed laser emission by investigation of its temporal evolution and frequency spectra with a high bandwidth oscilloscope and performing second harmonic intensity autocorrelations to determine its properties on ultrashort-timescales. [1] Bek et al., Opt. Express 2015; [2] Bek et al., APL. 2017