Special Issue "KTP Crystal for Nonlinear Optical and Electrooptic Applications"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (30 June 2018)

Special Issue Editor

Guest Editor
Prof. Vladimir Shur

School of Natural Sciences and Mathematics, Ural Federal University,620000 Ekaterinburg, Russian Federation
Website | E-Mail
Interests: ferroelectrics; domain structure; domain engineering; nonlinear optics; nanotechnology; light frequency conversion

Special Issue Information

Dear Colleagues,

During the last few decades, potassium titanyl phosphate (KTP) and its isomorphs have attracted a great deal of attention, mainly due to their application in various types of photonic devices. These materials possess large nonlinear optic and electro-optic coefficients, high optical damage threshold, as well as broad thermal and angular acceptance for second harmonic generation. The recent interest in increasing the frequency conversion efficiency by periodical poling using modern methods of micro- and nanodomain engineering in the crystals of KTP family is enormous.

This Special Issue will cover a wide range of topics related to KTP crystals: from last achievements in crystal growth, improvement of the gray-track resistance, and study of their piezoelectric, ferroelectric, electrooptical, and nonlinear-optical properties to various photonic applications in wide spectral range from near UV to THz. Special attention will be given to in situ study of the domain structure evolution with high temporal and spatial resolutions and new approaches to periodical poling based on surface modifications.

Scientists and engineers working with crystals of KTP family are invited to contribute to the issue.

Prof. Vladimir Shur
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • potassium titanyl phosphate
  • crystal growth
  • domain structure
  • domain engineering
  • piezoelectric and ferroelectric properties
  • electrooptical and nonlinear-optical properties
  • light frequency conversion
  • second harmonic generation
  • optical parametric oscillation
  • THz wave generation

Published Papers (3 papers)

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Research

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Open AccessArticle Analysis of Switching Current Data during Polarization Reversal in KTP Single Crystals with Surface Dielectric Layer
Crystals 2018, 8(8), 315; https://doi.org/10.3390/cryst8080315
Received: 27 June 2018 / Revised: 26 July 2018 / Accepted: 2 August 2018 / Published: 4 August 2018
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Abstract
Studies of polarization reversal processes in potassium titanyl phosphate (KTiOPO4, KTP) single crystals with surface dielectric layer are important due to their potential applications as the basis of bottom-up technology for creation of periodically poled nonlinear-optical crystals. We present the results
[...] Read more.
Studies of polarization reversal processes in potassium titanyl phosphate (KTiOPO4, KTP) single crystals with surface dielectric layer are important due to their potential applications as the basis of bottom-up technology for creation of periodically poled nonlinear-optical crystals. We present the results of switching currents analysis accompanied by in situ visualization of domain kinetics during polarization reversal in KTP with 3 m-thick photoresist dielectric layer. Qualitative change of the switching current shape has been revealed as compared to the polarization reversal without surface dielectric layer. Two stages of domain structure evolution have been distinguished by in situ visualization of domain kinetics. The formation of submicron domain streamers in front of the moving domain walls has been revealed. The broadening of the domain streamers (1D domain growth) was observed at the second stage. The switching currents were approximated by the modified Kolmogorov-Avrami formula taking into account the change of the growth dimensionality (“geometrical catastrophe”). The sufficient input of the 1D growth to the switching process decreased with increase of the switching field. The obtained results were attributed to the domain wall shape instability induced by retardation of the depolarization field screening in ferroelectric with surface dielectric layer. Full article
(This article belongs to the Special Issue KTP Crystal for Nonlinear Optical and Electrooptic Applications)
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Open AccessFeature PaperArticle Optical Properties of KTP Crystals and Their Potential for Terahertz Generation
Crystals 2018, 8(8), 310; https://doi.org/10.3390/cryst8080310
Received: 30 June 2018 / Revised: 23 July 2018 / Accepted: 28 July 2018 / Published: 31 July 2018
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Abstract
High nonlinearity, wide transparency range and optical quality allowed potassium titanyl phosphate (KTiOPO4, KTP) crystals to be used in a wide range of nonlinear applications. The success of KTP usage in the visible and infrared (IR) ranges drives interest in applying
[...] Read more.
High nonlinearity, wide transparency range and optical quality allowed potassium titanyl phosphate (KTiOPO4, KTP) crystals to be used in a wide range of nonlinear applications. The success of KTP usage in the visible and infrared (IR) ranges drives interest in applying it at longer wavelengths, that is, in the terahertz (THz) range. We use THz optical properties of KTP crystals measured by terahertz time-domain spectrometer (THz-TDS) and refractive index approximated in the form of Sellmeier equations to investigate KTP application possibilities for IR-to-THz and THz-to-THz wave conversion. As a result, phase matching for sf → f and sf → s types of difference frequency generation (DFG) of Ti:Sapphire laser (at the wavelengths of 0.65, 0.8 and 1.1 µm) is found possible, as well as second harmonic generation (SHG) of THz waves by f + sf type of interaction in the XZ principle plane of the crystal. Terahertz wave generation by phase-matched parametric processes in KTP demonstrates evident advantages in comparison with that of widely used MgO-doped LiNbO3 crystals. Full article
(This article belongs to the Special Issue KTP Crystal for Nonlinear Optical and Electrooptic Applications)
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Review

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Open AccessReview Structural Reasons for the Nonlinear Optical Properties of KTP Family Single Crystals
Crystals 2018, 8(7), 283; https://doi.org/10.3390/cryst8070283
Received: 13 June 2018 / Revised: 3 July 2018 / Accepted: 7 July 2018 / Published: 10 July 2018
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Abstract
A brief review focuses on studies into the structural reasons for the nonlinear optical properties of crystals of the potassium titanyl phosphate family, performed at the Shubnikov Institute of Crystallography. Accurate X-ray diffraction data are discussed, providing evidence that the optical susceptibility of
[...] Read more.
A brief review focuses on studies into the structural reasons for the nonlinear optical properties of crystals of the potassium titanyl phosphate family, performed at the Shubnikov Institute of Crystallography. Accurate X-ray diffraction data are discussed, providing evidence that the optical susceptibility of crystals is related not only to the alternation of long and short Ti–O bonds in the chains of TiO6 octahedra, but to the geometry of tetrahedral anions and the alkaline cation arrangement in the structure channels, as well. The contribution of each of the three structural components depends on the crystal composition. Full article
(This article belongs to the Special Issue KTP Crystal for Nonlinear Optical and Electrooptic Applications)
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