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Multistep quadratic cascading in broadband optical parametric generation
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-2508-391X
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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.

Place, publisher, year, edition, pages
2012. Vol. 37, no 10, 1727-1729 p.
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-98011DOI: 10.1364/OL.37.001727ISI: 000304312000044ScopusID: 2-s2.0-84862061453OAI: diva2:534808
Swedish Research Council, 622 2010 526 621 2011 4040

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: . 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: 2015-03-30Bibliographically approved
In thesis
1. Optical Parametric Devices in Periodically Poled LiTaO3
Open this publication in new window or tab >>Optical Parametric Devices in Periodically Poled LiTaO3
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.
Trita-FYS, ISSN 0280-316X ; 2013:65
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
urn:nbn:se:kth:diva-134915 (URN)978-91-7501-947-5 (ISBN)
Public defence
2013-12-20, FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, KTH, Stockholm, 10:00 (English)

QC 20131204

Available from: 2013-12-04 Created: 2013-12-02 Last updated: 2013-12-04Bibliographically approved

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Levenius, MartinPasiskevicius, ValdasLaurell, FredrikGallo, Katia
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