Electro-optical modulators based on KTP crystals for high-power lasers in the mid-IR region

Rusov, V. A.; Serebryakov, V. A.; Doroganov, S. V.; Kalintseva, N. A.; Narivonchik, A. S.; Skvortsov, D. V.

doi:10.1364/jot.83.000716

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Parametric generation based on stimulated polariton scattering in KTP shows superior performance in terms of gain and laser damage resistance in comparison to lithium niobate and lithium tantalate [10,11]. Other KTP applications include modulators for the near-and the mid-IR ranges [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of KTP Crystals and Their Potential for Terahertz Generation

et al. 2018

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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 s − f → f and s − f → 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 + s→f 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.

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Section: Introductionmentioning

confidence: 99%

Optical Properties of KTP Crystals and Their Potential for Terahertz Generation

et al. 2018

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“…Regarding the KTP and RTP-based PCs (KTP PC and RTP PC), one can then classify the cases of KTP/RTP PC of X/Y-cut directions (X/Y-cut KTP/RTP PC). The double crystal scheme providing thermal stabilization was applied back in the 1960s for television digital channels modulation with the use of KDP crystals with the difference that in KDP crystals, the beam propagates along the optical axis [52]. In our earlier work [53], we developed the scheme of a pulsed-periodic picosecond laser comprising an active-passive mode-locked and NFB-controlled picosecond Nd:YAG master oscillator combined with a regenerative amplifier on the same active crystal pumped with a fiber-coupled qcw laser diode array module.…”

Section: Introductionmentioning

confidence: 99%

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

et al. 2022

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Electro-optical modulators are effectively used for ultrafast pulse lasers operation control. The scheme of picosecond pulse-periodic high-peak-power Nd:YAG lasers is composed of an active-passive mode-locked and negative feedback-controlled master oscillator and regenerative amplifier based on common end-diode-pumped Nd:YAG crystal. A double-crystal thermally compensated Pockels cell based on KTP crystals of the Y-cut direction is employed as a key control element. The cell was assembled using a pair of equal-length crystals grown according to high-resistivity technology. The scheme provides output pulses with energy up to 1.6 mJ, a duration of 25 ps at repetition rates tunable from 0 to 200 Hz. The laser operation stages are analyzed in detail. The scheme looks attractive and promising for developing advanced ultrafast laser systems with higher repetition rates, peak and, accordingly, average power levels. The Pockels cell based on KTP crystals expands the line of available fast electro-optical control elements, along with the previously used RTP ones. The factors limiting laser pulse energy and repetition rate are discussed. Parasitic nonlinear conversion in the crystals of the Pockels cell along the axis may play an essential role. The results of comparative measurements of the second and third harmonics made with the Pockels cells based on KTP and RTP crystals of both X-cut and Y-cut directions are presented. The minimum second and third harmonics efficiency levels observed in the Y-cut Pockels cells of the KTP crystal seem to be their important advantage.

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“…In fiber lasers, the electro-optic [23] and acousto-optic modulators (AOM) are used to obtain Q-switching. The latter method is very widespread and can handle higher input optical power.…”

Section: Introductionmentioning

confidence: 99%

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

et al. 2022

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We demonstrate a detailed theoretical and experimental study of a thulium-doped fiber laser being Q-switched by means of an acousto-optic modulator. The processes leading to the generation of discontinuous multi-peak pulses with an energy of up to 5 μJ and a nanosecond structure are described. The dynamics of the multi-peak structure’s evolution is demonstrated and a method of switching to a single-pulse mode is proposed.

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Electro-optical modulators based on KTP crystals for high-power lasers in the mid-IR region

Cited by 4 publications

References 3 publications

Optical Properties of KTP Crystals and Their Potential for Terahertz Generation

Optical Properties of KTP Crystals and Their Potential for Terahertz Generation

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

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