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Series in Quantum Electronics
edited by
Henry Baltes, Peter Günter, Ursula Keller,
Fritz K. Kneubühl †, Walter Lukosz,
Hans Melchior, Markus W. Sigrist
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Vol. 62 Christian A. Zaugg, Novel Concepts in Modelocked VECSELs. 1st edition 2014. XXII, 129 pages, € 64,00. ISBN 978-3-86628-515-6 |
The goal of this thesis was to exploit the flexibility
of vertical external-cavity surface-emitting lasers (VECSELs) modelocked with a semiconductor saturable
absorber mirror (SESAM). By using conventional and novel concepts, the
parameter range and performance of such ultrafast VECSELs was successfully
expanded with respect to the repetition rate, absorber technology, electrically
pumped lasers and self-referenceable frequency combs.
A previous limitation for VECSELs was the low pulse
repetition rate regime. Within this thesis, a 100 MHz VECSEL based on a
standard cavity and a 250 MHz multi-pass arrangement were demonstrated, which
represents two convenient solutions to operate VECSELs in this regime. Besides
the SESAM, the novel absorber material graphene caught the attraction of the
ultrafast VECSEL community. A graphene saturable
absorber mirror (GSAM) was fabricated and used for VECSEL modelocking.
Furthermore, the GSAM devices were compared to state-of-the-art SESAMs.
Motivated by the demand of reducing the complexity of ultrafast pulse sources,
an improved electrically pumped VECSEL was developed. With an optimized gain
chip and a resonant, low-saturation fluence SESAM, a
record performance with a modelocked electrically
pumped VECSEL was achieved, including the highest average (53.2 mW) and peak power (4.7 W), the shortest pulses (2.5 ps) and the highest repetition rate (18.2 GHz). With
respect to new frontiers in optically pumped modelocked
VECSELs, the carrier-envelope-offset frequency of an ultrafast VECSEL was
detected by employing a 231 fs seed oscillator and a subsequent amplification
and compression scheme.
The results obtained within the scope of this thesis
demonstrate the flexibility of the vertical emitting semiconductor disk laser
technology and show the high potential for future applications.
About the author:
Christian A. Zaugg received his MSc in Physics from ETH Zürich in 2010.
After a stay as a visiting researcher in the Laser Science Group of Prof. F. K.
Tittel at the Rice University in Houston, Texas, he
joined the Ultrafast Laser Physics group at the Institute for Quantum
Electronics at ETH Zürich. His research interests include ultrafast vertical
emitting semiconductor lasers and their applications.
Keywords: ultrafast semiconductor lasers,
modelocked VECSELs, novel concepts
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