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Semiconductor Quantum-Dot Saturable Absorber Mirrors for Mode-Locking Solid-State Lasers
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-2508-391X
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
University of Dundee. (School of Engineering Physics and Mathematics)
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2014 (English)In: The Physics and Engineering of Compact Quantum Dot-based Lasers for Biophotonics / [ed] Edik Rafailov, Berlin: Wiley-VCH Verlagsgesellschaft, 2014, 1, 123-172 p.Chapter in book (Other academic)
Place, publisher, year, edition, pages
Berlin: Wiley-VCH Verlagsgesellschaft, 2014, 1. 123-172 p.
Keyword [en]
solid-state lasers, mode-locked ultra-short pulse trains, Cr:forsterite laser, Yb-laser, molecular beam epitaxy, pulse repetition rates, semiconductor, quantum dots, saturable absorbers
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-131452Scopus ID: 2-s2.0-84926397365ISBN: 978-3-527-41184-9 (print)OAI: oai:DiVA.org:kth-131452DiVA: diva2:656433
Note

QC 20131016

Available from: 2013-10-15 Created: 2013-10-15 Last updated: 2013-10-16Bibliographically approved
In thesis
1. Novel Technologies for Mode-Locking of Solid-State Lasers
Open this publication in new window or tab >>Novel Technologies for Mode-Locking of Solid-State Lasers
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The subject of this thesis is the investigation of novel technologies for mode-locking of diode-pumped, solid-state lasers. Novel saturable absorbers are used: quantum dots (QDs) and carbon nanotubes (CNTs), which both are low-dimensional nano-formations. In addition, mode-locking by cascaded nonlinearities is explored.

Absorber structures containing self-assembled InGaAs QDs are characterised in detail by pump-probe experiments, time-resolved photoluminescence spectroscopy, and measurement of the nonlinear reflectivity. The samples show sub-picosecond relaxation times of the reflectivity, modulation depths between 0.18% and 2.9%, as well as low saturation fluences on the order of 1–10μJ/cm2. The structures’ design parameters are related to their transient and nonlinear performance.

The characterised QD saturable absorbers are then used for mode-locking of diode-pumped, solid-state lasers, delivering picosecond pulses with optical spectra in the region of 1020–1040nm. In particular, a QD absorber with a saturation fluence of 4μJ/cm2 and a relaxation time <200fs is successfully employed for fundamental mode-locking of an Yb:KYW laser at a repetition rate of 1GHz. This laser emits pulses with a duration of 1.7ps at an output power of 339mW. Apart from this, an Yb-thin-disc laser is demonstrated, emitting pulses with a duration of 1.6ps at an output power of 13W, thereby showing, that the absorber withstands fluences of up to 2.4mJ/cm2 without being damaged.

An absorber with a linear loss of only 1% is obtained by embedding CNTs in a thin plastic film, coated onto a glass substrate. Using this absorber, mode-locking of an optically-pumped semiconductor disc-laser is achieved. The laser emits pulses with a duration of 1.12ps at a repetition rate of 613MHz and with an average output power of 136mW.

For cascaded mode-locking, a periodically-poled KTP crystal is placed inside a laser cavity and the two second-order nonlinearities from second-harmonic generation and back-conversion are used to emulate a third-order nonlinearity with an effective nonlinear refractive index of 2.33·10−17m2/W. For precise control of the nonlinearity, the laser’s spectrum is fixed to a wavelength of 1029.1nm by a volume Bragg grating. The laser emits pulses with a duration of 16ps at a repetition rate of 210MHz and with an output power of 690mW.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xiii, 131 p.
Series
Trita-FYS, ISSN 0280-316X ; 2013:48
Keyword
laser, mode-locked laser, pulsed laser, quantum dot, carbon nanotube, nonlinear optics, saturable absorber, Kerr-lens mode-locking, ultra-fast laser, picosecond laser, pulsed laser, semiconductor saturable absorber
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-131455 (URN)978-91-7501-840-9 (ISBN)
Public defence
2013-11-05, FA32, AlbaNova Universitetscentrum, Stockholm, 10:00 (English)
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Note

QC 20131016

Available from: 2013-10-16 Created: 2013-10-15 Last updated: 2013-10-16Bibliographically approved

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Pasiskevicius, Valdas

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