Optical breakdown threshold in nanosecond high repetition second harmonic generation by periodically poled Mg-doped LiTaO3 crystal

Louchev, Oleg A.; Hatano, Hideki; Wada, Satoshi; Kitamura, Kenji

doi:10.1063/1.4819758

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…General approach to the optimization of nonlinear conversion of laser radiation is based on the combined computational modeling of (i) the equations of non-linear frequency conversion and (ii) laser absorption effects inducing photoionization kinetics, heating, change of refractive indexes and dephasing. [25][26][27][28] In this work we consider a reduced model which is limited only by the main mechanisms involved in the onset of discharge enabling us to develop the analytical treatment of laser-gas photoionization kinetics with explicit estimations of the related photoionization thresholds. Firstly, we suggest the analytical approximations for (i) photoionization kinetics by the involved laser harmonics and (ii) threshold input laser intensities corresponding to the onset of full-scale discharge.…”

Section: Introductionmentioning

confidence: 99%

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

et al. 2016

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We develop a set of analytical approximations for the estimation of the combined effect of various photoionization processes involved in the resonant four-wave mixing generation of ns pulsed Lyman-α (L-α) radiation by using 212.556 nm and 820-845 nm laser radiation pulses in Kr-Ar mixture: (i) multi-photon ionization, (ii) step-wise (2+1)-photon ionization via the resonant 2-photon excitation of Kr followed by 1-photon ionization and (iii) laser-induced avalanche ionization produced by generated free electrons. Developed expressions validated by order of magnitude estimations and available experimental data allow us to identify the area for the operation under high input laser intensities avoiding the onset of full-scale discharge, loss of efficiency and inhibition of generated L-α radiation. Calculations made reveal an opportunity for scaling up the output energy of the experimentally generated pulsed L-α radiation without significant enhancement of photoionization.

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Section: Introductionmentioning

confidence: 99%

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

et al. 2016

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“…Damage morphologies on the ceramic sample surface induced by nanosecond pulses at the wavelength of 1064 nm are recorded; here, the pulses are nearly Gaussian beams and the pulse duration is 12 ns. According to the one-on-one regime of ISO 11254-1, [16,17] twenty sites for each energy density are tested. Error analysis of pulse energies, spot sizes, and so on yields an error budget of damage probability of about 15%.…”

Section: Laser-induced Damage Thresholdmentioning

confidence: 99%

High-power electro-optic switch technology based on novel transparent ceramic

Zhang¹,

Ye²,

Qu³

et al. 2016

Chinese Phys. B

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A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structure Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretically and experimentally. The electro-optic ceramic is used as a phase retarder for the clockwise and counter-clockwise polarized light, and their polarization directions are adjusted to their orthogonal positions by using two half-wave plates. The output light then becomes polarization-independent with respect to the polarization direction of the input light. The switch characteristics, including splitter ratios and polarization states, are theoretically analyzed and simulated in detail by the matrix multiplication method. An experimental setup is built to verify the analysis and experimental results. A new component ceramic is used and a nonpolarizing cube beam splitter (NPBS) replaces the beam splitter (BS) to lower the ON/OFF voltage to 305 V and improve the extinction ratio by 2 dB. Finally, the laser-induced damage threshold for the proposed switch is measured and discussed. It is believed that potential applications of this novel polarization-independent electro-optic switch technology will be wide, especially for ultrafast high-power laser systems.

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“…This decrease in the coercive field has made it possible to fabricate PPSLT devices [7][8][9] with apertures as large as 5 mm×5 mm. PPSLT crystals are also resistant to optical laser damage [10]. Both a wide aperture and damage resistance are prerequisites for a wavelength convertor in any mid-IR LUT application.…”

Section: Introductionmentioning

confidence: 99%

Mid IR pulsed light source for laser ultrasonic testing of carbon-fiber-reinforced plastic

Hatano

Watanabe

Kitamura

et al. 2015

J. Opt.

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A quasi-phase-matched (QPM) optical parametric oscillator (OPO) was developed using a periodically poled Mg-doped stoichiometric LiTaO3 crystal to generate mid-IR light for excitation of laser ultrasound in carbon fiber reinforced plastic (CFRP). The ultrasound generation efficiency was measured at the three different wavelengths that emanate from the OPO: 1.064 μm, 1.59/1.57 μm, and 3.23/3.30 μm. The measurements indicate that mid-IR 3.2–3.3 μm light generates the most efficient ultrasonic waves in CFRP with the least laser damage. We used mid-IR light in conjunction with a laser interferometer to demonstrate the detection of flaws/defects in CFRP such as the existence of air gaps that mimic delamination and voids in CFRP, and the inhomogeneous adhesion of CFRP material to a metal plate was also clearly detected.

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Optical breakdown threshold in nanosecond high repetition second harmonic generation by periodically poled Mg-doped LiTaO3 crystal

Abstract: Articles you may be interested inLaser-induced breakdown and damage generation by nonlinear frequency conversion in ferroelectric crystals: Experiment and theory

Cited by 9 publications

References 37 publications

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

High-power electro-optic switch technology based on novel transparent ceramic

Mid IR pulsed light source for laser ultrasonic testing of carbon-fiber-reinforced plastic

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