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QPM Devices in KTA and RKTP
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Even though KTiOPO4 (KTP) is considered to be one of the best nonlinear materials for quasi phase matched (QPM) frequency conversion in the visible and the near-infrared spectral regions, its use is often limited by poor material homogeneity, high ionic conductivity, a considerable linear absorption and photochromatic damage. On the other hand, the improved material homogeneity and the lower ionic conductivity of bulk Rb-doped KTP (RKTP) make this material an ideal alternative for fabrication of fine-pitch QPM gratings, while the arsenate isomorph KTiOAsO4 (KTA) promises a better performance in the green spectral region and adds the advantage of a wider transparency window in the infrared. Unfortunately, the available studies on these materials are limited and unable to answer the question whether RKTP and KTA are feasible alternatives to KTP in terms of periodic poling and optical performance. The optical performance of the QPM devices depends on the periodic poling quality, therefore, a detailed comprehension of domain-grating formation in the KTP isomorphs is highly desired. The goals of this thesis were to gain a better understanding of the periodic poling process in the KTP isomorphs, in order to study the specifics of ferroelectric domain engineering in KTA and RKTP, and to evaluate the optical performance of these isomorphs. Fine-pitch periodically poled structures were engineered both in KTA and RKTP crystals. It was demonstrated that QPM gratings with excellent quality and with periods as short as 8.49 μm can be fabricated in KTA crystals. Comparative transmission studies have shown that periodically poled KTA (PPKTA) crystals can be superior to KTP for QPM second harmonic generation in the visible spectral region due to lower linear absorption. It was also demonstrated that RKTP is a superior alternative to KTP for high-quality QPM grating fabrication. A consistent room-temperature periodic poling of 5 mm thick RKTP crystals with a period of 38.86 μm has been achieved. The obtained large aperture periodically poled RKTP (PPRKTP) crystals showed an outstanding QPM grating uniformity and excellent optical performance in optical parametric oscillator (OPO) applications. Moreover, it was shown that RKTP is less susceptible to blue-induced infrared absorption than KTP. Finally, a novel and a relatively simple method for self-assembling quasi-periodic sub-μm scale ferroelectric domain structure in RKTP crystals has been presented. It was shown that, after treatment in aqueous KOH/KNO3 solution, periodic poling of RKTP with planar electrodes resulted in one-dimensional ferroelectric domain structure with an average periodicity of 650±200 nm, extending over the whole 1 mm thick crystal. Such self-assembled structures in RKTP were used to demonstrate 5th order non-collinear QPM backward second harmonic generation.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2014. , xiv, 98 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2013:71
Keyword [en]
QPM, periodic poling, KTP
National Category
Other Materials Engineering Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-139475ISBN: 978-91-7501-974-1 (print)OAI: oai:DiVA.org:kth-139475DiVA: diva2:687051
Public defence
2014-01-31, sal FB52, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140114

Available from: 2014-01-14 Created: 2014-01-13 Last updated: 2014-01-14Bibliographically approved
List of papers
1. Periodically poled KTiOAsO4 for highly efficient midinfrared optical parametric devices
Open this publication in new window or tab >>Periodically poled KTiOAsO4 for highly efficient midinfrared optical parametric devices
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2009 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 95, no 19Article in journal (Refereed) Published
Abstract [en]

We demonstrate high pattern-fidelity periodic poling of KTiOAsO4 at room temperature. The periodically poled crystal shows a d(eff) of 10.1 pm/V and is used in an optical parametric oscillator pumped at 1064 nm to generate parametric radiation at 1538 and 3452 nm with a conversion efficiency of 45%.

Keyword
aperture, ktiopo4, crystals, energy, oscillation, generation, ktp
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-19047 (URN)10.1063/1.3258001 (DOI)000272756600088 ()2-s2.0-70449725114 (Scopus ID)
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
2. 5 mm thick periodically poled Rb-doped KTP for high energy optical parametric frequency conversion
Open this publication in new window or tab >>5 mm thick periodically poled Rb-doped KTP for high energy optical parametric frequency conversion
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2011 (English)In: Optical Materials Express, ISSN 2159-3930, Vol. 1, no 2, 201-206 p.Article in journal (Refereed) Published
Abstract [en]

A 5 mm thick periodically poled bulk Rb-doped KTiOPO4 (KTP) crystal with a period of 38.86 μm was fabricated by electric field poling. Chemical etching and optical evaluation show a high quality of the periodic ferroelectric domain structure through the whole crystal aperture. The fabricated quasi-phase matching (QPM) device was used in an optical parametric oscillator pumped at 1064 nm with 12 ns pulses at 100 Hz repetition rate to generate 60 mJ parametric radiation with a conversion efficiency of 50%.

Place, publisher, year, edition, pages
Optical Society of America, 2011
Keyword
Ferroelectrics, nonlinear optics, parametric processes
National Category
Atom and Molecular Physics and Optics Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-51075 (URN)10.1364/OME.1.000201 (DOI)000299046900010 ()2-s2.0-84855248482 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20111209

Available from: 2011-12-09 Created: 2011-12-09 Last updated: 2015-03-30Bibliographically approved
3. Fabrication of submicrometer quasi-phase-matched devices in KTP and RKTP [Invited]
Open this publication in new window or tab >>Fabrication of submicrometer quasi-phase-matched devices in KTP and RKTP [Invited]
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2011 (English)In: Optical Materials Express, ISSN 2159-3930, Vol. 1, no 7, 1319-1325 p.Article in journal (Refereed) Published
Abstract [en]

We review the techniques used for fabrication of bulk submicrometer ferroelectric domain gratings in KTiOPO4 (KTP) and demonstrate that bulk Rb-doped KTiOPO4 (RKTP) is an excellent candidate for implementation of dense domain gratings. Compared to KTP, RKTP presents predominant domain propagation along the polar c-direction, substantially reduced lateral domain broadening, and higher poling yield. As a result we obtain homogeneous sub-μm periodic poling of RKTP with a period of 690 nm in 1 mm thick samples.

Place, publisher, year, edition, pages
Optical Society of America, 2011
Keyword
Ferroelectrics, nonlinear optics, parametric processes
National Category
Atom and Molecular Physics and Optics Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-51093 (URN)000299049200019 ()2-s2.0-80755172823 (Scopus ID)
Funder
Swedish Research Council
Note
QC 20111209Available from: 2011-12-09 Created: 2011-12-09 Last updated: 2015-03-30Bibliographically approved
4. Second-harmonic generation in periodically poled bulk Rb-doped KTiOPO4 below 400 nm at high peak-intensities
Open this publication in new window or tab >>Second-harmonic generation in periodically poled bulk Rb-doped KTiOPO4 below 400 nm at high peak-intensities
2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 2, 1395-1403 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate that bulk Rb-doped KTiOPO4 (RKTP) shows improved susceptibility to gray-tracking compared to flux-grown KTiOPO4. We show high-fidelity periodic poling of 1 mm thick RKTP with a period of 3.18 mu m for second harmonic generation at 398 nm with a normalized conversion efficiency of 1.79%/Wcm. The crystal is used to frequency-double 138 fs-long pulses with an efficiency of 20% and a peak intensity of 560 MW/cm(2) without visible gray-tracking signs. We demonstrate that two-photon absorption is the predominant mechanism limiting the SHG efficiency in this spectral range at high peak powers and high repetition rates.

Place, publisher, year, edition, pages
Optical Society of America, 2013
Keyword
Nonlinear optics, materials, Ferroelectrics, Harmonic generation and mixing
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-116381 (URN)10.1364/OE.21.001395 (DOI)000315989500004 ()2-s2.0-84874049906 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20130220

Available from: 2013-01-17 Created: 2013-01-17 Last updated: 2017-12-06Bibliographically approved
5. High-fidelity periodic domain structures in KTiOAsO4 for the visible spectral range
Open this publication in new window or tab >>High-fidelity periodic domain structures in KTiOAsO4 for the visible spectral range
2013 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 3, no 9, 1444-1449 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate room temperature periodic poling of KTiOAsO4 crystals with a period of 8.49 mu m for second harmonic generation of 1066 nm wavelength. The crystals are tested in a continuous wave SHG setup at 533 nm and show high quality periodic ferroelectric domain structure across the whole 1 mm crystal thickness, exhibiting d(eff) = 10.5 pm/V and normalized conversion efficiency of 1.2%/Wcm.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-129449 (URN)10.1364/OME.3.001444 (DOI)000323944700025 ()2-s2.0-84884191614 (Scopus ID)
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

QC 20131002

Available from: 2013-10-02 Created: 2013-09-30 Last updated: 2017-12-06Bibliographically approved
6. Quasi-periodic self-assembled sub-micrometer ferroelectric bulk domain gratings in Rb-doped KTiOPO4
Open this publication in new window or tab >>Quasi-periodic self-assembled sub-micrometer ferroelectric bulk domain gratings in Rb-doped KTiOPO4
2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 103, no 25, 252905- p.Article in journal (Refereed) Published
Abstract [en]

We present a simple technique for fabricating quasi-periodic bulk sub-μm ferroelectric domain gratings in Rb-doped KTiOPO4 (RKTP) based on self-organized ferroelectric domain formation. One-dimensional ferroelectric domain structures, with an average periodicity of 650 ± 200 nm and extending throughout 1 mm thick crystals, are obtained by etching and subsequent electric field poling using planar electrodes. The sub-μm structures in RKTP were used to demonstrate 5th order non-collinear quasi-phase matched backward second harmonic generation.

Keyword
RKTP, periodic poling, self-assembled
National Category
Other Physics Topics Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-139358 (URN)10.1063/1.4853315 (DOI)000329973800064 ()2-s2.0-84891480983 (Scopus ID)
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20140114

Available from: 2014-01-10 Created: 2014-01-10 Last updated: 2017-12-06Bibliographically approved
7. High-power continuous-wave frequency-doubling in KTiOAsO4
Open this publication in new window or tab >>High-power continuous-wave frequency-doubling in KTiOAsO4
Show others...
2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 25, 30453-30459 p.Article in journal (Refereed) Published
Abstract [en]

High-power continuous-wave generation at 533 nm is demonstrated in bulk periodically poled KTiOAsO4 (KTA) by single-pass frequency doubling of a VBG-locked Yb-doped fiber laser. Absorption characteristic and second harmonic generation (SHG) performance of different KTA samples are studied and compared. The best performing sample catered for 25%-efficient SHG of 13.6 W green light with high spatial beam quality M2 <1.2.

Keyword
Absorption characteristics, Continuous wave generation, Continuous waves, Frequency-doubling, Green light, Periodically poled, Spatial beam quality, Yb-doped fiber lasers
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-139426 (URN)10.1364/OE.21.030453 (DOI)000328575700031 ()2-s2.0-84890474072 (Scopus ID)
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

QC 20140114

Available from: 2014-01-14 Created: 2014-01-13 Last updated: 2017-12-06Bibliographically approved

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