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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
Vol. 54
Selina Pekarek
New Frontiers in Frequency Combs
from Diode-Pumped Solid State Lasers
1st edition 2011. XXVI, 114 pages, € 64,00.
ISBN 978-3-86628-410-4
This thesis describes the development of novel
ultrafast laser sources for compact self-referenced frequency comb generation.
The frontiers of the key parameters, such as noise performance, average power
and repetition rate, are explored for frequency combs based on diode-pumped
solid state lasers (DPSSLs). DPSSLs combine the favorable
properties of cost-efficient diode-pumping and an intrinsic low quantum noise
limit. A challenge for stabilization of the frequency comb is the detection of
the carrier envelope offset (CEO) frequency. The standard approach
with an f-to-2f interferometer scheme is based on a coherent octave-spanning
spectrum which requires high peak powers and short pulses.
In this thesis, the noise performance of a fully
stabilized frequency comb from an Er:Yb:glass
oscillator is studied. The intrinsic low noise of the 1.5-μm DPSSL
resulted in a low noise CEO beat, for which a tight phase lock was achieved
using a feedback bandwidth of only 5.5 kHz. Furthermore, the first
self-referenceable frequency comb from a DPSSL with a gigahertz repetition rate
is presented. The modelocked Yb:KG(WO4)2 laser delivered 2.2 W average power in
290-fs pulses at the repetition rate of 1 GHz. The pulse duration was reduced
with a passive fiber-compressor to 100 fs at 1.1-W
average power and an octave spanning coherent spectrum was generated in a
highly nonlinear PCF which enabled the CEO beat detection. Moreover, a
self-referenceable frequency comb with an unprecedented high average power
without amplification is presented. A modelocked Yb:Lu2O3 thin-disk laser generated 7 W of average power in 142
fs pulses at the repetition rate of 64 MHz. This
enabled for the first time the detection of the CEO beat frequency from a
thin-disk laser.
About
the author:
Selina Pekarek received her diploma in physics in 2007 from ETH
Zurich. She joined the Institute of Quantum Electronics at ETH Zurich in the
same year. Her research interests include the development of novel ultrafast
laser sources in particular with high repetition rates and for self-referenced
frequency combs, as well as supercontinuum generation in highly nonlinear fibers.
Keywords:
Supercontinuum Generation, Diode-Pumped Solid State Laser, Frequency Comb, Modelocked Laser, High Repetition Rate, High Average Power,
Thin Disk Laser, SESAM, Metrology, Gigahertz
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