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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. 37
Edith Innerhofer,
High Average
Power Yb:YAG
Thin Disk Laser and its Application
for An RGB Laser Source
1st edition 2005. 130 pages, € 64,00. ISBN 3-86628-010-6
Femtosecond lasers with high average output powers are attractive
sources for applications such as nonlinear wavelength conversion. This thesis
reports on the development of a mode-locked Yb:YAG thin disk laser delivering femtosecond pulses
with unprecedented average power. This laser is based on the concept of a
passively mode-locked thin disk laser, a combination of a thin disk laser head
and a semiconductor saturable absorber mirror
(SESAM). The thin disk concept employs a sophisticated geometry of the gain
medium that allows for high power laser operation with diffraction-limited beam
quality. The SESAM on its part offers unique freedom in the design of important
absorber parameters for stable and reliable passive mode locking. Tunable pulse durations from 6-24 ps
with an average power of up to 60 W at 34 MHz and a modified laser
setup delivering 80 W of average power in 705 fs pulses at
57 MHz are demonstrated. A practical red-green-blue (RGB) laser system
based on the high power femtosecond Yb:YAG
thin disk laser and subsequent frequency conversion stages is experimentally
demonstrated and numerically analyzed. This system
presents, compared to previously demonstrated systems, some significant
advances in terms of simplicity and practicability and simultaneously generates
record-high average powers of 8 W at 603 nm, 23 W at 515 nm
and 10.1 W at 450 nm. Additionally nonlinear experiments discussed in
this thesis are external fiber compression in a microstructured fiber, a fiber-feedback optical parametric oscillator and room
temperature optical parametric generation based on periodically poled MgO-doped LiTaO3.
Edith Innerhofer received her
diploma degree in experimental physics from the Swiss Federal Institute of
Technology in Zurich, where she joined the Institute of Quantum Electronics in
January 2001. Her research focused on passively mode-locked thin disk lasers
with high average output power and femtosecond pulse durations and on their
applications for nonlinear optical experiments. She has written and co-authored
more than 25 scientific journal articles and conference contributions.
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