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Crystals 2018, 8(8), 310;

Optical Properties of KTP Crystals and Their Potential for Terahertz Generation

Institute of Automation & Electrometry, SB RAS, 1, Ac. Koptyug Ave., Novosibirsk 630090, Russia
Institute of Monitoring of Climatic and Ecological Systems, SB RAS, 10/3, Akademicheskii Ave., Tomsk 634055, Russia
Siberian Physical Technical Institute of Tomsk State University, 1 Novosobornaya Sq., Tomsk 634050, Russia
Institute of Thermophysics, SB RAS, 1, Ac. Lavrent’ev Ave., Novosibirsk 630090, Russia
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 23 July 2018 / Accepted: 28 July 2018 / Published: 31 July 2018
(This article belongs to the Special Issue KTP Crystal for Nonlinear Optical and Electrooptic Applications)
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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. View Full-Text
Keywords: KTP; nonlinear crystal; frequency conversion; SHG; DFG; THz radiation; THz wave KTP; nonlinear crystal; frequency conversion; SHG; DFG; THz radiation; THz wave

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Mamrashev, A.; Nikolaev, N.; Antsygin, V.; Andreev, Y.; Lanskii, G.; Meshalkin, A. Optical Properties of KTP Crystals and Their Potential for Terahertz Generation. Crystals 2018, 8, 310.

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