Laser-induced ionization and intrinsic breakdown of wide band-gap solids

Gruzdev, Vitali E.; Chen, J.K.

doi:10.1007/s00339-007-4258-4

Cited by 13 publications

(11 citation statements)

References 49 publications

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“…This result is absolutely similar to the (4) is directly related to the mentioned electron oscillations that are essentially the Bloch ones 3,5,25 : it is the ratio of Bloch-oscillation frequency to laser frequency. The multiphoton regime corresponds to small values of the ratio while the tunneling regime is reached at high values of the parameter (4).…”

Section: Photo-excitation Of the Super-latticessupporting

confidence: 78%

“…That approximation is very characteristic of wide band-gap dielectrics, e.g., alkali halides (Ref. [5] and references therein) and corresponds to almost flat valence band with almost perfect cosine shape of the conduction band Valence mini-band ε V (p) and the lowest conduction mini-band ε C (p) of the super-lattice with the rectangular potential (Fig. 3).…”

Section: Some Properties Of the Super-latticesmentioning

confidence: 97%

“…1) It is required to understand to what degree the results of the previous calculations 3, 5 can be extended to those periodic quantum structures, in particular, to show that the suppression and the singularity effects predicted for the bulk materials can be observed for those structures; 2) It is required to identify proper periodic structures that allow observation of those specific photo-excitation regimes without damaging the irradiated samples.…”

Section: Introductionmentioning

confidence: 99%

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Photo-ionization of superlattices on dielectric surface by IR radiation

Gruzdev

2007

SPIE Proceedings

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In this paper we analyze the photo-excitation of electron sub-system of a periodic nano-structure by IR laser radiation. The nano-structure is a 1D super-lattice on surface of dielectric or semiconductor material transparent for the incident radiation. Theoretical description of the photo-excitation is based on the recent modification of the Keldysh theory adapted to the 1D case. We show that two specific regimes of the photo-excitation are possible in the super-lattices: photo-excitation suppression corresponding to decrease of the photo-excitation rate with increasing of laser intensity, and singularity regime corresponding to abrupt increase of the photo-ionization rate. Threshold of the singularity regime is calculated as function of laser wavelength and super-lattice period. The obtained results allow to propose a promising application of the super-lattices as intensity limiters for IR optical systems. In particular, we can calculate the period of the super-lattice to provide limiting of input laser intensity at required level due to multi-photon absorption by electrons of the lattice. Temperature of laser-induced heating resulted from total absorption of an incident laser pulse and diffraction distortions induced by the super-lattice are estimated to confirm possibility of utilizing the super-lattices as the intensity limiters.

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Section: Photo-excitation Of the Super-latticessupporting

confidence: 78%

Section: Some Properties Of the Super-latticesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Photo-ionization of superlattices on dielectric surface by IR radiation

Gruzdev

2007

SPIE Proceedings

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“…Thus, it should match reasonably the intrinsic LIBT values derived from the theoretical model proposed in. 13 In our proposal, the empirical value for LIBT-fluence can be extracted from the fitting parameters of the absorption curve using the following formula…”

Section: Absorption Dynamicsmentioning

confidence: 99%

Absorption dynamics and structural changes due to laser-induced breakdown in transparent dielectrics

Janulewicz

Grigorov

et al. 2015

Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers

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Amount of energy deposited by a single, tightly focused nanosecond laser pulse in different transparent materials was measured vs. either the incident intensity or energy fluence. An integrating sphere enabled quantification of the energy scattered during the long-lived breakdown process. It was shown that absorptance dependence on the photon flux can be analytically described by the sigmoidal Hill function. We suggest using this analytical description to quantify empirical laser-induced breakdown threshold (LIBT). The structured changes in the breakdown area were analysed by the means of different kinds of microscopy, especially by the high-resolutiontransmission-electron-microscopy (HRTEM). The analysis revealed nanocrystallisation in the densified material surrounding the void.

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“…There are still controversies as those regarding difference up to two orders of magnitude in the threshold values for 10 ns pulse 6 and unambiguous definition of the intrinsic breakdown threshold. 7 The process of micro-explosion occurring during the breakdown usually leads to noticeable changes in the material features. 8 Investigation of the modified material's structure could provide a new insight into the history and character of the processes responsible for that.…”

Section: Introductionmentioning

confidence: 99%

Breakdown in a bulk of transparent solids under irradiation of a nanosecond laser pulse

et al. 2014

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A single pulse of a nanosecond laser was tightly focused in the bulk of transparent materials (soda lime glass, borosilicate glass, fused silica , sapphire and Gorilla Glass) to a beam spot diameter of ∼ 2.1μm. A value of the total energy absorbed in the materials was measured with corrections for the transmitted, scattered and reflected components of the incident energy. It was found that 3-11% of the incident radiation was scattered but the total absorption still achieved a very high level of up to 88%. Absorptance dependence on the incident fluence was reasonably approximated by the sigmoidal Hill function. Here we suggest using this analytical description to identify empirical intrinsic laser-induced breakdown threshold (LIBT). Optical damage threshold (ODT) was identified by optical inspection. The results for some materials suggest significantly lower breakdown threshold than that reported earlier for more loosely focused beams. A study of the damage area morphology with a scanning electron microscope (SEM) and a high resolution transmission microscope (HRTEM) revealed existence of the shock waves-affected area with a localized nano-crystallization. Spectroscopic study of the light emission accompanying breakdown showed typical quasi-continuum emission with temperature as high as 8917K (0.8 eV).

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Laser-induced ionization and intrinsic breakdown of wide band-gap solids

Cited by 13 publications

References 49 publications

Photo-ionization of superlattices on dielectric surface by IR radiation

Photo-ionization of superlattices on dielectric surface by IR radiation

Absorption dynamics and structural changes due to laser-induced breakdown in transparent dielectrics

Breakdown in a bulk of transparent solids under irradiation of a nanosecond laser pulse

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