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Optical Parametric Devices in Periodically Poled LiTaO3
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optical parametric frequency conversion based on quasi phase matching (QPM) in nonlinear optical crystals is a powerful technique for generating coherent radiation in wavelength ranges spanning from the mid-infrared (mid-IR) to the blue, displaying low thermal load and high efficiency.This thesis shows how QPM in one- (1D) or two-dimensional (2D) lattices can be employed to engineer novel devices for parametric downconversion in the IR, af-fording freedom in designing both spectral and angular properties of the parametric output. Experimental demonstrations of parametric devices are supported by theoreti-cal modelling of the nonlinear conversion processes.In particular, broadband parametric downconversion has been investigated in 1D QPM lattices, through degenerate downconversion close to the point of zero group-velocity dispersion. Ultra-broadband optical parametric generation (OPG) of 185 THz bandwidth (at 10 dB), spanning more than one octave from 1.1 to 3.7 μm, has been achieved in periodically poled 1 mol% MgO-doped near-stoichiometric LiTaO3 (MgSLT) of 25 μm QPM period, pumped at 860 nm. Such broadband gain is of high interest for ultrashort optical pulse amplification, with applications in high harmonic generation, ultrafast spectroscopy and laser ablation. Furthermore, the det-rimental impact of parasitic upconversion, creating dips in the OPG spectrum, has been investigated. By altering the pump pulse duration, energy can be backconverted to create peaks at the involved OPG wavelengths, offering a possible tool to enhance broadband parametric gain spectra.The engineering of the angular properties of a parametric output benefits greatly from 2D QPM, which is investigated in this thesis by the specific example of hexagonally poled MgSLT. It is demonstrated how two OPG processes, supported by a single 2D QPM device, can exhibit angularly and spectrally degenerate signals (idlers). This degeneracy results in a coherent coupling between the two OPG pro-cesses and a spectrally degenerate twin-beam output in the mid-IR (near IR). 2D QPM devices exhibiting such coherently coupled downconversion processes can find applications as compact sources of entangled photon-pairs. This thesis further illus-trates the design freedom of 2D QPM through the demonstration of a device support-ing multiple parametric processes, thus generating multiple beams from the mid-IR to the blue spectral regions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xiii, 91 p.
Series
Trita-FYS, ISSN 0280-316X ; 2013:65
Keyword [en]
nonlinear optics, parametric processes, frequency downconver-sion, quasi-phase matching, LiTaO3, broadband downconversion, quadratic cascading, nonlinear photonic crystals, twin-beam generation
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-134915ISBN: 978-91-7501-947-5 (print)OAI: oai:DiVA.org:kth-134915DiVA: diva2:668721
Public defence
2013-12-20, FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20131204

Available from: 2013-12-04 Created: 2013-12-02 Last updated: 2013-12-04Bibliographically approved
List of papers
1. Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO(3)
Open this publication in new window or tab >>Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO(3)
2011 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 5, 4121-4128 p.Article in journal (Refereed) Published
Abstract [en]

We report on broadband gain in an optical parametric generator based on periodically poled 1 mol% magnesium-doped stoichiometric LiTaO(3) (PPMg:SLT). More than an octave-spanning parametric gain, stretching from near to mid-infrared, is generated by pumping the crystals close to the point where, at parametric degeneracy, the waves experience zero group-velocity dispersion. Using a picosecond Ti:sapphire source, we measured the broadest parametric gain bandwidths, 180 THz at 10 dB, in PPMg: SLT gratings with a period of 25 mu m pumped at 860 nm.

Place, publisher, year, edition, pages
Optical Society of America, 2011
Keyword
ktiopo4, laser, ultrabroadband, amplification, linbo3
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-39208 (URN)10.1364/OE.19.004121 (DOI)000288870300034 ()2-s2.0-79952167566 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note
This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-5-4121. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. QC 20120119Available from: 2012-01-19 Created: 2011-09-08 Last updated: 2017-12-08Bibliographically approved
2. Twin-beam optical parametric generation in chi((2)) nonlinear photonic crystals
Open this publication in new window or tab >>Twin-beam optical parametric generation in chi((2)) nonlinear photonic crystals
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 98, no 16, 161113- p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate optical parametric generation in two-dimensional purely nonlinear lattices. Experiments performed in hexagonally poled LiTaO3 crystals pumped around 800 nm indicate a coherent contribution to the parametric gain arising from multiple resonances of the lattice, resulting in dual-beam signal outputs in the 1-1.7 mu m range. (C) 2011 American Institute of Physics. [doi:10.1063/1.3583444]

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-33483 (URN)10.1063/1.3583444 (DOI)000289842700013 ()2-s2.0-79955415726 (Scopus ID)
Funder
Swedish Research Council, 2010-526
Note
QC 20110509Available from: 2011-05-09 Created: 2011-05-09 Last updated: 2017-12-11Bibliographically approved
3. Multistep quadratic cascading in broadband optical parametric generation
Open this publication in new window or tab >>Multistep quadratic cascading in broadband optical parametric generation
Show others...
2012 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 37, no 10, 1727-1729 p.Article in journal (Refereed) Published
Abstract [en]

We theoretically and experimentally investigate multistep parametric processes in broadband optical parametric generators (OPGs) based on periodically poled 1 mol. % MgO-doped stoichiometric LiTaO3. We demonstrate that parametric collateral processes may deplete or enhance spectral portions of the OPG output, depending on pump pulse duration.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-98011 (URN)10.1364/OL.37.001727 (DOI)000304312000044 ()2-s2.0-84862061453 (Scopus ID)
Funder
Swedish Research Council, 622 2010 526 621 2011 4040
Note

QC 20120618

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-37-10-1727 . Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Available from: 2012-06-18 Created: 2012-06-18 Last updated: 2017-12-07Bibliographically approved
4. Angular degrees of freedom in twin-beam parametric down-conversion
Open this publication in new window or tab >>Angular degrees of freedom in twin-beam parametric down-conversion
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 12, 121114- p.Article in journal (Refereed) Published
Abstract [en]

We investigate the effect of angular tuning on coherently coupled optical parametric generation (OPG) in two-dimensional purely nonlinear lattices and demonstrate how it allows accessing both shared signal and shared idler regimes, resulting in twin-beam outputs in the mid- and near infrared, respectively. Furthermore, we present the results of a systematic spectral and angular mapping of the twin-beam OPG response in the near-infrared as a function of the pump incidence angle.

Keyword
Nonlinear Photonic Crystals, Stoichiometric Lithium Tantalate, 2nd-Harmonic Generation, Linbo3, Wave, Fabrication, Pulses
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-104093 (URN)10.1063/1.4754148 (DOI)000309425700014 ()2-s2.0-84866883121 (Scopus ID)
Projects
Purely Nonlinear Photonic Crystals
Funder
Swedish Research Council, 622-2010-526Swedish Research Council, 621-2011-4040EU, FP7, Seventh Framework Programme, PIEF-GA-2009-234798
Note

QC 20150629

Available from: 2012-10-29 Created: 2012-10-29 Last updated: 2017-12-07Bibliographically approved

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