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Publications (10 of 192) 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
Viotti, A.-L., Laurell, F., Zukauskas, A., Canalias, C. & Pasiskevicius, V. (2019). Coherent Temporal Phase Transfer in Backward Wave Parametric Oscillator at 1.4 mu m. In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA. IEEE
Open this publication in new window or tab >>Coherent Temporal Phase Transfer in Backward Wave Parametric Oscillator at 1.4 mu m
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2019 (English)In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The frequency modulation transfer property of a backward wave optical parametric oscillator is employed to generate compressed near-IR pulses at 1.4 mu m with 1.3ps duration. Limitations to the linear frequency modulation transfer in BWOPO are investigated.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-259468 (URN)10.23919/CLEO.2019.8750599 (DOI)000482226303038 ()2-s2.0-85069227937 (Scopus ID)978-1-943580-57-6 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA
Note

QC 20190920

Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-09-20Bibliographically 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
Kianirad, H., Laurell, F. & Canalias, C. (2019). Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam. Applied Physics Letters, 115(5), Article ID 052901.
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 1077-3118, Vol. 115, no 5, article id 052901Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
AMER INST PHYSICS, 2019
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-257572 (URN)10.1063/1.5101039 (DOI)000478913700014 ()2-s2.0-85070060048 (Scopus ID)
Note

QC 20190923

Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-09-23Bibliographically 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
Zukauskas, A., Viotti, A.-L., Coetzee, R. S., Liljestrand, C., Pasiskevicius, V. & Canalias, C. (2019). Recent advances in sub-mu m PPKTP for non-linear interactions with counter-propagating photons. 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 109020G.
Open this publication in new window or tab >>Recent advances in sub-mu m PPKTP for non-linear interactions with counter-propagating photons
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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 109020GConference paper, Published paper (Refereed)
Abstract [en]

Mirrorless optical parametric oscillators (MOPO) represent a special class of parametric devices based on three-wave nonlinear interaction in which the generated photons counter-propagate. Owing to the phase-matching condition of the counter-propagating waves, MOPOs can sustain oscillation without mirrors and present unique and useful tuning and spectral properties. In this paper, we will review our recent advances in structuring technology to achieve quasi-phase matching periodicities as short as 500 nm in Rb-doped KTiOPO4, which are necessary to compensate for the large phase mismatch. We will also review the performance of MOPOs both in the ps- and ns- pumping regime. In the latter, our crystals reach single-pass conversion efficiencies exceeding 50%, with mJ-level output energies.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING, 2019
Series
Proceedings of SPIE, ISSN 0277-786X ; 10902
Keywords
Nonlinear optics, parametric devices, QPM, periodic poling, MOPO, KTP, ferroelectrics, frequency conversion
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-255230 (URN)10.1117/12.2514724 (DOI)000471820400009 ()2-s2.0-85066757391 (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 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2070-9167

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