Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor laser I: VECSEL and cascade lasers

HL 70.6: Vortrag

Mittwoch, 2. April 2014, 16:15–16:30, POT 112

SESAM mode-locked AlGaInP-VECSEL emitting femtosecond pulses — •Roman Bek, Grizelda Kersteen, Hermann Kahle, Thomas Schwarzbäck, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen and Research Center SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Since 2000, semiconductor saturable absorber mirrors (SESAMs) have been used for passive mode locking of vertical external-cavity surface-emitting lasers (VECSELs) emitting in the infrared spectral range. These laser systems are able to produce femtosecond pulses with an average power of several watts. In contrast, the first passively mode-locked VECSEL emitting picosecond pulses in the visible spectrum could only be realized in 2013.

We present the first SESAM mode-locked VECSEL producing femtosecond pulses at a wavelength of 664 nm and a repetition rate of 836 MHz. We use an absorber containing two quantum wells close to the surface and an additional fused silica coating. Due to a plane diamond heatspreader bonded onto the gain chip, we observe side pulses with a time delay of 8.95 ps. The laser spectrum shows the superposition of a soliton-like part and a “continuum” which has already been observed for soliton-like mode-locked semiconductor disk lasers in the infrared spectral range.