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Publications (10 of 191) Show all publications
Tjörnhammar, S., Maestroni, V., Uždavinys, T. K., Zukauskas, A., Canalias, C., Pasiskevicius, V. & Laurell, F. (2019). Blue light induced infrared absorption and color-center fluorescence in KTP isomorphs. In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015: . Paper presented at 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015; International Congress Centre (ICM)Munich; Germany; 21 June 2015 through 25 June 2015. Optical Society of America
Open this publication in new window or tab >>Blue light induced infrared absorption and color-center fluorescence in KTP isomorphs
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2019 (English)In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America, 2019Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-251855 (URN)2-s2.0-85063818612 (Scopus ID)9781467374750 (ISBN)
Conference
2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015; International Congress Centre (ICM)Munich; Germany; 21 June 2015 through 25 June 2015
Note

QC 20190528

Available from: 2019-05-28 Created: 2019-05-28 Last updated: 2019-05-28Bibliographically approved
Viotti, A.-L., Laurell, F., Zukauskas, A., Canalias, C. & Pasiskevicius, V. (2019). Coherent phase transfer and pulse compressionat 1.4μm in a backward-wave OPO [Letter to the editor]. Optics Letters, 44(12), 3066-3069
Open this publication in new window or tab >>Coherent phase transfer and pulse compressionat 1.4μm in a backward-wave OPO
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2019 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 12, p. 3066-3069Article in journal, Letter (Refereed) Published
Abstract [en]

The frequency modulation transfer property of a backward-wave optical parametric oscillator (BWOPO) is investigated in the context of near-IR pulse compression. The maximum transferrable bandwidth from the pump to the forward wave in a BWOPO is determined by the group dispersion mismatch. In comparison, the third-order phase introduced in a single-grating compressor setup is more detrimental to achieve optimum compression of the BWOPO forward wave. Nevertheless, we demonstrate a 220 GHz bandwidth transfer from 800 nm to 1.4 μm, with a compression factor of 115, leading to near-IR pulses as short as 1.3 ps with μJ energy.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252767 (URN)10.1364/OL.44.003066 (DOI)000471636700031 ()2-s2.0-85067983411 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-07 Created: 2019-06-07 Last updated: 2019-07-29Bibliographically approved
Kianirad, H., Canalias, C. & Laurell, F. (2019). Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam [Letter to the editor]. Applied Physics Letters
Open this publication in new window or tab >>Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam
2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118Article in journal, Letter (Refereed) Submitted
Abstract [en]

Scanning electron microscopy was used to study the mobility of domain walls in vapor-transport equilibrated stoichiometric LiTaO3. By using low-acceleration voltage, switching occurs solely for polarization pointing-up domains, resulting in fast domain-wall motion. When the incoming electron beam was more energetic with larger penetration depth, the switching instead occurred for polarization pointing down domains. Our results are discussed in terms of the interaction of the scanning electron beam with the polarization-screening charges at the crystal surface.

Keywords
ferroelectrics, domain wall
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-249385 (URN)
Note

QC 20190412

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-12Bibliographically approved
Zukauskas, A., Pasiskevicius, V., Laurell, F. & Canalias, C. (2019). Fan-out periodically poled structures in Rb-doped KTiOPO4 for continuously tunable QPM devices. In: Schunemann, PG Schepler, KL (Ed.), NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XVIII. Paper presented at Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XVIII, FEB 05-07, 2019, San Francisco, CA. SPIE-INT SOC OPTICAL ENGINEERING, Article ID UNSP 109020N.
Open this publication in new window or tab >>Fan-out periodically poled structures in Rb-doped KTiOPO4 for continuously tunable QPM devices
2019 (English)In: NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XVIII / [ed] Schunemann, PG Schepler, KL, SPIE-INT SOC OPTICAL ENGINEERING , 2019, article id UNSP 109020NConference paper, Published paper (Refereed)
Abstract [en]

Since the first demonstration of electric field poling in 1993, the use of quasi-phase matching (QPM) technique has gained wide adoption in a multitude of applications. The QPM field today is dominated mainly by the ferroelectric oxide materials from LiNbO3 (LN) and KTiOPO4 (KTP) families, where QPM structures are implemented by the electric field poling technique. While typical QPM devices have a fixed-period, one-dimensional domain grating design, which is the most straightforward to implement, numerous applications require the ability to continuously tune the wavelength over a wider spectral range. For applications where temperature tuning is not desired, a fan-out QPM grating design may be advantageous. The tuning here is performed by transverse translation of the structure in respect to the pump beam, while keeping the crystal temperature constant. While the implementation of fan-out gratings is reasonably well researched in LN, there is a lack of reliable data for KTP isomorphs. Taking into account the high domain growth anisotropy in KTP, an important factor becomes the angle between the domain walls and the b-axis of the crystal. This angle directly affects the quality and dimensions of the QPM device. However, its upper boundary has not been determined to date. In this work we discuss the prospects and limitations of PPKTP devices with fan-out grating designs. We present a fan-out PPRKTP device, where the transverse fan-out rate is 0.5 mu m/mm. In an OPO configuration pumped by 532 nm such PPRKTP crystal is able to provide continuously tunable radiation between 0.7 -2.2 mu m.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING, 2019
Series
Proceedings of SPIE, ISSN 0277-786X ; 10902
Keywords
periodic poling, KTP, frequency conversion, fan-out, OPO, parametric devices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-255236 (URN)10.1117/12.2505623 (DOI)000471820400013 ()2-s2.0-85066756130 (Scopus ID)978-1-5106-2447-4 (ISBN)
Conference
Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XVIII, FEB 05-07, 2019, San Francisco, CA
Note

QC 20190730

Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2019-08-19Bibliographically approved
Cordero-Edwards, K., Kianirad, H., Canalias, C., Sort, J. & Catalan, G. (2019). Flexoelectric Fracture-Ratchet Effect in Ferroelectrics. Physical Review Letters, 122(13), Article ID 135502.
Open this publication in new window or tab >>Flexoelectric Fracture-Ratchet Effect in Ferroelectrics
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 13, article id 135502Article in journal (Refereed) Published
Abstract [en]

The propagation front of a crack generates large strain gradients and it is therefore a strong source of gradient-induced polarization (flexoelectricity). Herein, we demonstrate that, in piezoelectric materials, a consequence of flexoelectricity is that crack propagation is helped or hindered depending on whether it is parallel or antiparallel to the piezoelectric polar axis. The discovery of crack propagation asymmetry proves that fracture physics cannot be assumed to be symmetric in polar materials, and indicates that flexoelectricity should be incorporated in any realistic model.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-249790 (URN)10.1103/PhysRevLett.122.135502 (DOI)000463900300007 ()2-s2.0-85064039748 (Scopus ID)
Note

QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-04-24Bibliographically approved
Viotti, A.-L., Zukauskas, A., Canalias, C., Laurell, F. & Pasiskevicius, V. (2019). Narrowband, tunable, infrared radiation by parametric amplification of a chirped backward-wave OPO signal. Optics Express, 27(8), 10602-10610, Article ID 360745.
Open this publication in new window or tab >>Narrowband, tunable, infrared radiation by parametric amplification of a chirped backward-wave OPO signal
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 8, p. 10602-10610, article id 360745Article in journal (Refereed) Published
National Category
Natural Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-249969 (URN)000464614400044 ()2-s2.0-85064454429 (Scopus ID)
Note

QC 20190516

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-05-16Bibliographically approved
Lindgren, G., Kalinin, S. V., Vasudevan, R. K. & Canalias, C. (2019). Polarization-dependent local conductivity and activation energy in KTiOPO4. Applied Physics Letters, 114(19), Article ID 192901.
Open this publication in new window or tab >>Polarization-dependent local conductivity and activation energy in KTiOPO4
2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 19, article id 192901Article in journal (Refereed) Published
Abstract [en]

We study the local conductivity properties of KTiOPO4 using conductive atomic force microscopy in ultrahigh vacuum (UHV). We show that domains with opposite orientations have different conductivity values. We investigate the temperature dependence of the local conductivity and report a difference in the activation energy of 25% between different domains. Furthermore, we show that the local conductivity increases with the number of biased-scans. Finally, it is found that the domain wall conductivity previously observed at ambient conditions vanishes in UHV. Our results are discussed in terms of the screening effects and surface conditions.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-254104 (URN)10.1063/1.5090475 (DOI)000470152800010 ()
Note

QC 20190624

Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved
Kianirad, H., Lindgren, G., Peña, A., Zukauskas, A., Ménaert, B., Laurell, F., . . . Canalias, C. (2019). Stabilization of domain structures in Rb-doped KTiOPO 4 for high-temperature processes. Applied Physics Letters, 114(5), Article ID 052904.
Open this publication in new window or tab >>Stabilization of domain structures in Rb-doped KTiOPO 4 for high-temperature processes
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 5, article id 052904Article in journal (Refereed) Published
Abstract [en]

A way to stabilize the domain structure in periodically poled Rb-doped KTiOPO 4 samples at high-temperatures is presented. The domain contraction along the b-crystallographic axis that is observed when crystals are annealed at high temperatures is suppressed when the ends of the domains along the b-axis are diced away. Additionally, the thermal stability of self-assembled domain gratings with a sub-μm average periodicity of 650 ± 200 nm and a domain-width of 225 ± 75 nm in mm-thick samples is investigated, and it is shown that the key factor for the domain stability is the domain width rather than the interdomain distance.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-244202 (URN)10.1063/1.5082246 (DOI)000458202800023 ()2-s2.0-85061337178 (Scopus ID)
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-04-11Bibliographically approved
Lu, D., Peña, A., Segonds, P., Debray, J., Zukauskas, A., Laurell, F., . . . Boulanger, B. (2018). Angular quasi-phase-matching in a sphere of PPRKTP. In: Optics InfoBase Conference Papers: . Paper presented at Mid-Infrared Coherent Sources, MICS 2018, 26 March 2017 through 28 March 2017. Optical Society of America
Open this publication in new window or tab >>Angular quasi-phase-matching in a sphere of PPRKTP
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2018 (English)In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper, Published paper (Refereed)
Abstract [en]

we report the first measurements of angular quasi-phase-matching directions of secondharmonic generation performed in the periodically-poled Rb-doped KTiOPO4 biaxial crystal cut as a sphere.

Place, publisher, year, edition, pages
Optical Society of America, 2018
Keywords
Infrared devices, Optical parametric oscillators, Rubidium compounds, Titanium compounds, Biaxial crystal, KTiOPO4, Measurements of, Periodically poled, Quasi phase matching, Second-harmonic, Phase matching
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-236429 (URN)10.1364/MICS.2018.MT2C.5 (DOI)2-s2.0-85047169138 (Scopus ID)9781557528209 (ISBN)
Conference
Mid-Infrared Coherent Sources, MICS 2018, 26 March 2017 through 28 March 2017
Note

QC 20181025

Available from: 2018-10-25 Created: 2018-10-25 Last updated: 2018-10-25Bibliographically approved
Lindgren, G. & Canalias, C. (2018). Conductive atomic force microscopy studies of charged domain walls in KTiOPO4. AIP Advances, 8(8), Article ID 085214.
Open this publication in new window or tab >>Conductive atomic force microscopy studies of charged domain walls in KTiOPO4
2018 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 8, no 8, article id 085214Article in journal (Refereed) Published
Abstract [en]

We study the conductive properties of charged domain walls in KTiOPO4 using conductive atomic force microscopy. We show that the region of increased conductivity at the domain wall broadens when the wall is in motion, extending from the initial wall position to the final wall position. When wall motion stops, the conductive region attains a narrow width. The magnitude of the conductivity of charged domain walls is four times larger than that of the surrounding domains, as is the case at stationary wall. We investigate

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-235136 (URN)10.1063/1.5042034 (DOI)000443722300069 ()2-s2.0-85052281598 (Scopus ID)
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20180917

Available from: 2018-09-17 Created: 2018-09-17 Last updated: 2018-10-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2070-9167

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