Numerical simulation and experimental investigation of parametric generation of light pulses in a KTP crystal

Sevruk, B. B.; Белый, В. Н.; Gakhovich, D. E.; Orlovich, V. A.

doi:10.1007/bf02681423

Cited by 3 publications

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“…In view of the need to construct wholly solid-state sources, the use of OPO based on KTP crystals is an effective alternative to direct generation of ES radiation using Er-containing lasers [1, 2] and generation of ES radiation based on Raman transformation of Nd 3+ laser radiation operating at the 4 F 3/2 → 4 I 13/2 (λ g ~ 1.35 µm) transition [3][4][5]. Operation under non-critical phase synchronization and generation of ES radiation in the nanosecond range with energies of tenths and hundredths of millijoules can be achieved with pumping by Nd 3+ -radiation with amplitude modulation of an OPO in KTP crystals [6][7][8][9]. Owing to the high energy characteristics, these OPO are promising for many practical applications, several of which, however, require very reliable OPO operation and relatively low radiation divergence.…”

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Travelling-wave 1.57-µm optical parametric oscillator driven by a pulsed multimode Nd3+:YAG laser

et al. 2008

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The generation properties of an optical parametric oscillator (OPO) with a three-mirror ring resonator have been investigated under conditions of a pulsed pump by multimode radiation from a Nd 3+ :YAG laser. KTP crystals were used as the OPO nonlinear medium. At pump energies up to 100 mJ, decreasing the diameter d of the Nd 3+ :YAG laser beam causes a decrease in OPO radiation divergence and an increase in the generation efficiency at λ = 1.571 µm despite a decrease in the differential efficiency. At d = 2.25 mm and a KTP crystal total length of 40 mm, the efficiency of the pump conversion to the signal-wave pulse reaches 36.5%. Based on the traveling-wave OPO, a compact, highly effective, eye-safe laser source radiating pulses of up to 35 mJ in energy, 11 nsec in duration, and 10 Hz in repetition rate at electrical pump energy of ≤ 8 J is developed. At the 86.5% level of the total pulse energy, the source-beam divergence does not exceed seven diffraction limits.Introduction. One method for producing eye-safe (ES) radiation is based on the use of an optical parametric oscillator (OPO) of radiation in KTP (KTiPO 4 ) crystals pumped by radiation from Nd 3+ lasers (λ g ~ 1 µm). In view of the need to construct wholly solid-state sources, the use of OPO based on KTP crystals is an effective alternative to direct generation of ES radiation using Er-containing lasers [1, 2] and generation of ES radiation based on Raman transformation of Nd 3+ laser radiation operating at the 4 F 3/2 → 4 I 13/2 (λ g ~ 1.35 µm) transition [3][4][5]. Operation under non-critical phase synchronization and generation of ES radiation in the nanosecond range with energies of tenths and hundredths of millijoules can be achieved with pumping by Nd 3+ -radiation with amplitude modulation of an OPO in KTP crystals [6][7][8][9]. Owing to the high energy characteristics, these OPO are promising for many practical applications, several of which, however, require very reliable OPO operation and relatively low radiation divergence.One of the pathways for meeting these requirements is to construct an OPO based on an unstable telescopic resonator. The leakage of signal radiation from the axial region of the resonator to the periphery that is typical of such a resonator leads for several outputs of the resonator to a correlation of the phases for all points of the output cross section of the source and thereby reduces the divergence of the generated radiation. Furthermore, unstable resonators typically have a rather homogeneous distribution of the generation field in the transverse cross section. The advantages of the OPO with an unstable telescopic resonator have been demonstrated [10-13] for instances of extracavity and intracavity location of the OPO relative to the Nd 3+ -laser that generates both multimode pumping beams and beams for which the divergence is close to the diffraction limit.It has been shown [14] that the divergence of the radiation generated by an OPO under critical phase synchronism conditions can be decreased by combining effects o...

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Travelling-wave 1.57-µm optical parametric oscillator driven by a pulsed multimode Nd3+:YAG laser

et al. 2008

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“…A., Dashkevich U. I., Orlovich V. а., Shkadarevich A. P. Thermal effects in the eye-safe ring optical parametric oscillator based on KTiOPO Введение. Параметрические генераторы света на кристаллах семейства KтР (калий титанил фосфат -KTiOPO 4 ) являются высокоэффективными нелинейно-оптическими преобразователями 1-микронного излучения неодимовых лазеров в безопасный для глаз спектральный диапазон 1,5-1,6 мкм [1][2][3][4][5][6][7][8][9][10]. Компактные, надежные, конструктивно крепкие лазерные источники безопасного для глаз излучения востребованы для широкого круга практических применений, к числу которых можно отнести детектирование загрязнений атмосферы, связь с использованием открытого пространства, дальнометрию, подсветку, целеуказание и т. п.…”

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THERMAL EFFECTS IN THE EYE-SAFE RING OPTICAL PARAMETRIC OSCILLATOR BASED ON KTiOPO4 CRYSTALS

Rusak¹,

Дашкевич²,

Орлович³

et al. 2018

Vescì Akademìì navuk Belarusì. Seryâ fizika-matematyčnyh navuk

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For an eye-safe optical parametric oscillator (OPO) built on the basis of a three-mirror ring cavity, each section of which (the space between adjacent plane mirrors) contains a x-cut KTiOPO4 (KТР) crystal having a size of 15(х) × 7(y) × 7(z) mm3, the thermal effects due to idler wave absorption in KTP crystals were investigated. These thermal effects were evaluated by means of experimental measurement of the change in the OPO performance (divergence of the output beam and pulse energy) when transferring the OPO from the mode of generation of occasional single pulses to the mo de of generation of periodically repetitive pulses. It was found when the eye-safe OPO pumped by multimode YAG: Nd laser radiation generates 8-ns pulses with a repetition rate of 10 Hz and an energy of 30–35 mJ, thermal distortions of KTP crystals placed in metal holders at their natural air-cooling, are moderate. The total effect of positive thermolenses induced in nonlinear crystals leads to an increase in the divergence of the beam of the eye-safe OPO by 10 % and to a decrease in the efficiency of the OPO by 0.76 %, by virtue of fact that the induced thermal lenses are not ideal and thereby introduce additional aberration losses into the OPO cavity. The theoretical simulation of the OPO operation in the plane-wave approximation with the use of a system of three coupled first-order abridged differential equations showed that among three KTP crystals the KTP crystal placed first in the path of pump radiation in the OPO is the largest thermal load and the action of the most intense beams.

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Pulsed Parametric Oscillator Based on KTP Crystals with a Three-Mirror Ring Cavity: Numerical Simulation

et al. 2023

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Numerical simulation and experimental investigation of parametric generation of light pulses in a KTP crystal

Cited by 3 publications

References 6 publications

Travelling-wave 1.57-µm optical parametric oscillator driven by a pulsed multimode Nd3+:YAG laser

Travelling-wave 1.57-µm optical parametric oscillator driven by a pulsed multimode Nd3+:YAG laser

THERMAL EFFECTS IN THE EYE-SAFE RING OPTICAL PARAMETRIC OSCILLATOR BASED ON KTiOPO4 CRYSTALS

Pulsed Parametric Oscillator Based on KTP Crystals with a Three-Mirror Ring Cavity: Numerical Simulation

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