Influence of the mode composition of laser radiation on the optical breakdown of silicate glasses

Glebov, Leonid; Efimov, Oleg M.; Petrovskiĭ, G. T.; Rogovtsev, P. N.

doi:10.1070/qe1984v014n02abeh004833

Cited by 21 publications

(10 citation statements)

References 2 publications

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“…4 and was reported also in Refs. [56,57]. The threshold behavior is stochastic for "regular" Nd:YAG laser pulses exhibiting picosecond intensity spiking from longitudinal mode beating that changes from pulse to pulse but is highly reproducible when temporally smooth slm laser pulses are used.…”

Section: Wavelength Dependence Of the Breakdown Thresholdmentioning

confidence: 98%

“…Measurements are performed using singlelongitudinal mode (slm) laser pulses providing a smooth, reproducible temporal pulse shape that is essential for a precise threshold determination [19,56,57]. The I th (λ) spectrum exhibits peaks consistent with an initiation energy E ini = 6.6 eV, slightly above the threshold for solvated electron formation.…”

Section: Part Of the Solvated Electronsmentioning

confidence: 99%

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Wavelength dependence of nanosecond infrared laser-induced breakdown in water: Evidence for multiphoton initiation via an intermediate state

et al. 2015

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Investigation of the wavelength dependence (725 -1025 nm) of the threshold for nanosecond optical breakdown in water revealed steps consistent with breakdown initiation by multiphoton ionization, with an initiation energy of about 6.6 eV. This value is considerably smaller than the autoionization threshold of about 9.5 eV, which can be regarded as band gap relevant for avalanche ionization. Breakdown initiation is likely to occur via excitation of a valence band electron into a solvated state, followed by rapid excitation into the conduction band. Theoretical analysis based on these assumptions suggests that the seed electron density required for initiating avalanche ionization drops from 2.5×10 15 cm -3 at 725 nm to 1.1×10 12 cm -3 at 1025 nm. These results demand changes of future breakdown modeling for water including the use of a larger band gap than previously employed, the introduction of an intermediate energy level for initiation, and consideration of the wavelength dependence of seed electron density.

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Section: Wavelength Dependence Of the Breakdown Thresholdmentioning

confidence: 98%

Section: Part Of the Solvated Electronsmentioning

confidence: 99%

Wavelength dependence of nanosecond infrared laser-induced breakdown in water: Evidence for multiphoton initiation via an intermediate state

et al. 2015

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“…Facilities equipped with an injection seeder that selects one SLM, enable one to carry out reproducible laser damage experiments [1]. On the other hand, without the injection seeder (i.e., MLM), the temporal instabilities of the laser pulses raise many issues about laser-induced damage (LID) [2][3][4]. The influence of mode composition on LID at 1064 nm (1ω) has been studied for the bulk of optical materials such as silicate glasses [3] and fused silica [4].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced damage morphology in fused silica at 1064 nm in the nanosecond regime

et al. 2014

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The morphology of laser-induced damage sites at the exit surface of fused silica is tightly correlated to the mode composition of the nanosecond laser pulses at 1064 nm. In the single longitudinal mode (SLM) configuration, a molten and fractured central zone is surrounded by a funnel-shaped surface modification. Ring patterns surround the damage sites when these are initiated by multiple longitudinal modes (MLM) laser pulses. In this last mode configuration, the pulses temporal profiles as well as the damage ring patterns differ from pulse to pulse. The appearance chronology of the rings is found to be closely related to the temporal shape of the laser pulses. This supports that the damage morphology originates from the coupling of a laser-supported detonation wave propagating in air with an ablation mechanism in silica. In our experiments, the propagation speed of the detonation wave reaches about 20 km/s and scales as the cube root of the laser intensity, in good agreement with theory.

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“…First, the laser radiation pulses must have no spatial-temporal fluctuation of their intensity [10]. This is especially important for the pulses of duration longer than 100 ps, where a single-frequency laser radiation has to be used.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, that data cannot be used for a judgment about the bulk damage because the bulk and the surface of the materials have strongly different physical properties and electron energy spectra. Consequently, as a rule, the bulk and surface LID thresholds have different absolute values as well as their statistical distributions [10,13].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic single- and multiple-pulse laser-induced damage in silicate glasses in the femtosecond-to-nanosecond region

2004

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We show that the threshold power density of the intrinsic laser-induced damage in borosilicate glass at ϳ1 m wavelength does not depend on pulse duration from 2 ϫ 10 −13 to 3 ϫ 10 −8 s and has the same value for both single-and multiple-pulse exposure of the sample. This indicates that the mechanism of the intrinsic damage in glasses involves a collective response of a certain volume in the dielectric as a whole, such as "dielectric-metal" phase transition, rather than a process of individual generation and accumulation of electrons, such as multiphoton, tunneling, or avalanche. Also, we demonstrate that under femtosecond exposure the threshold of the plasma formation in transparent glasses is considerably higher than the threshold of the residual change of medium parameters.

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Influence of the mode composition of laser radiation on the optical breakdown of silicate glasses

Cited by 21 publications

References 2 publications

Wavelength dependence of nanosecond infrared laser-induced breakdown in water: Evidence for multiphoton initiation via an intermediate state

Wavelength dependence of nanosecond infrared laser-induced breakdown in water: Evidence for multiphoton initiation via an intermediate state

Laser-induced damage morphology in fused silica at 1064 nm in the nanosecond regime

Intrinsic single- and multiple-pulse laser-induced damage in silicate glasses in the femtosecond-to-nanosecond region

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