Reduction of damage threshold in dielectric materials induced by negatively chirped laser pulses

Louzon, E.; Henis, Z.; Pecker, S.; Ehrlich, Y.; Fisher, D.; Fraenkel, M.; Zigler, A.

doi:10.1063/1.2140476

Cited by 36 publications

(19 citation statements)

References 18 publications

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“…This feature is identified in the experiments reported here by irreversible change of the surface [22]. The ODT is a consequence of multiphoton followed by impact ionization of the snow [23][24][25][26]. The free electrons generated by ionization escape the target and due to charge separation they pull the ions out of the target.…”

Section: Properties Of Microstructured Snow Targetssupporting

confidence: 49%

Proton Acceleration by Ultrashort Intense Laser Interaction with Microstructured Snow Targets

et al. 2015

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Enhanced proton acceleration to high energy by relatively modest ultrashort laser pulses and structured dynamic plasma snow targets was demonstrated experimentally. High proton yield emitted to narrow solid angle with energies of up 25 MeV were detected from interaction of a 5 TW laser with snow targets. The high yield was attributed to a carefully planned prepulse and microstructured snow targets. We studied experimentally the minimal energy requirements for the adequate prepulse and we are using PIC simulations to study the dynamics of acceleration process. Based on our simulations, we predict that using the proposed scheme protons can be accelerated to energies above 150 MeV by 100 TW laser systems.

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Section: Properties Of Microstructured Snow Targetssupporting

confidence: 49%

Proton Acceleration by Ultrashort Intense Laser Interaction with Microstructured Snow Targets

et al. 2015

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“…The on-axis spectral evolution, driven by nonlinear optical effects, generated different shapes for the maximum plasma densities in the material when comparing the monochromatic and instantaneous frequency photoionization models, and were critical to modeling the pulse filamentation dynamics. These results among others [37][38][39] demonstrate the urgent need for new models of LID that account for the multi-frequency nature of ultrashort laser pulses.…”

Section: Resultsmentioning

confidence: 76%

Ultrafast laser-induced damage and the influence of spectral effects

Gulley

2012

Opt. Eng

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Abstract. Numerous studies have investigated the prerequisite role of photoionization in ultrafast laser-induced damage (LID) of bulk dielectrics. This study examines the role of spectral width and instantaneous laser frequency in LID using a frequency dependent multiphoton ionization (MPI) model and numerical simulation of initially 800 nm laser pulses propagating through fused silica. Assuming a band gap of 9 eV, MPI by an 800 nm field is a six-photon process, but when the instantaneous wavelength is greater than 827 nm an additional photon is required for photoionization, reducing the probability of the event by many orders of magnitude. Simulation results suggest that this frequency dependence can significantly impact the onset of LID and ultrashort pulse filamentation in solids.

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“…Furthermore, both experiment and pulse propagation equations demonstrate that the energy absorbed by the plasma from ultrashort pulses varies as a function of the instantaneous intensity slope and pulse chirp. [30][31][32] In this work we present a comprehensive theoretical framework in which to overcome these limitations in some cases and specify the limits of its applicability.…”

Section: Theorymentioning

confidence: 99%

Plasma generation by ultrashort multi-chromatic pulses during nonlinear propagation

2014

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The use of femtosecond lasers in industrial, biomedical, and defense related applications during the last 15 years has necessitated a detailed understanding of pulse propagation coupled with ultrafast laser-material interactions. Current models of ultrashort pulse propagation in solids describe the pulse evolution of fields with broad spectra and are typically coupled to models of ionization and laser-plasma interaction that assume monochromatic laser fields. In this work we address some of the errors introduced by combining these inconsistent descriptions. In particular, we show that recently published experiments and simulations demonstrate how this contradiction can produce order-of-magnitude errors in calculating the ionization yield, and that this effect leads to altered dimensions and severity of optical breakdown and laser-induced modifications to dielectric solids. We introduce a comprehensive treatment of multi-chromatic non-equilibrium laser-material interaction in condensed matter and successfully couple this model to a unidirectional (frequency-resolved) pulse propagation equation for the field evolution. This approach, while more computationally intensive than the traditional single rate equation for the free electron density, reduces the number of adjustable phenomenological parameters typically used in current models. Our simulation results suggest that intentionally multi-chromatic fields (i.e. strongly chirped pulses or co-propagating pulses of different frequencies) can be arranged to control ionization yields and hence ultrafast laser induced material modifications.

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Reduction of damage threshold in dielectric materials induced by negatively chirped laser pulses

Cited by 36 publications

References 18 publications

Proton Acceleration by Ultrashort Intense Laser Interaction with Microstructured Snow Targets

Proton Acceleration by Ultrashort Intense Laser Interaction with Microstructured Snow Targets

Ultrafast laser-induced damage and the influence of spectral effects

Plasma generation by ultrashort multi-chromatic pulses during nonlinear propagation

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