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Angular degrees of freedom in twin-beam parametric down-conversion
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO. (Kvantelektronik och Kvantoptik)
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-2508-391X
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO. (Kvantelektronik och Kvantoptik)ORCID iD: 0000-0001-7185-0457
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.

Place, publisher, year, edition, pages
2012. Vol. 101, no 12, 121114- p.
Keyword [en]
Nonlinear Photonic Crystals, Stoichiometric Lithium Tantalate, 2nd-Harmonic Generation, Linbo3, Wave, Fabrication, Pulses
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-104093DOI: 10.1063/1.4754148ISI: 000309425700014ScopusID: 2-s2.0-84866883121OAI: diva2:563170
Purely Nonlinear Photonic Crystals
Swedish Research Council, 622-2010-526Swedish Research Council, 621-2011-4040EU, FP7, Seventh Framework Programme, PIEF-GA-2009-234798

QC 20150629

Available from: 2012-10-29 Created: 2012-10-29 Last updated: 2015-06-29Bibliographically 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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