Filamentation of high-power femtosecond laser radiation

Kandidov, V.P.; Shlenov, S. A.; Kosareva, O.G.

doi:10.1070/qe2009v039n03abeh013916

Cited by 268 publications

(120 citation statements)

References 298 publications

(314 reference statements)

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“…[1]), the SC generation in bulk media appears to be a more complex process that involves an intricate coupling between spatial and temporal effects. The physical picture of SC generation in transparent bulk media could be understood in the framework of femtosecond filamentation, which provides a universal scenario of nonlinear propagation and spectral broadening of intense femtosecond laser pulses in solids, liquids and gases [53][54][55][56].…”

Section: Physical Picture Of Supercontinuum Generationmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

165

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Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

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Section: Physical Picture Of Supercontinuum Generationmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

165

View full text Add to dashboard Cite

show abstract

“…In recent decades, extra high peak power laser pulses allowing to obtain the extreme intensity of the electromagnetic field in the focus of an ultra-short laser pulses have led to a variety of new applications as well as atmospheric analysis and remote sensing of molecules [1], supercontinuum generation [2,3], precise scalpels for delicate eye surgery [4], driving sources for table-top particle accelerators [5], etc. Also, one of the most promising applications of ultrafast lasers is a femtosecond-laser processing of transparent materials such as glasses [6], crystals [7], and polymers [8].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast light-matter interaction in transparent medium

Коровин¹

2012

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The ultrafast interaction between high power laser light and plasma has been studied theoretically. The theoretical simulations are based on the nonlinear Schrödinger equation taking into account group velocity dispersion, diffraction, self-focusing and multiphoton absorption. The plasma is formed during propagation of femtosecond laser pulse with high input power in transparent medium due to multiphoton ionization process. The induced plasma results in light scattering with formation of multiple cones. It was found that plasma forms cone region that is inverse to cones appearing from scattering of electromagnetic field. The Fourier transformation of temporal-spatial dependences of plasma density demonstrates formation of quasi-periodic structure for plasma waves.Keywords: light-matter interaction, ultra-short laser pulse, multiphoton process, transparent medium.Manuscript received 15.12.11; revised version received 05.01.12; accepted for publication 26.01.12; published online 29.03.12.

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“…We show formation of tubular structure of the beam and explain reasons of its appearance. Fluence and linear plasma concentration dependencies on propagation distance are analyzed.Filamentation of laser radiation is a phenomenon of formation of a long spatiotemporal structure with high power density [1]. Femtosecond filamentation has been widely studied for Gaussian and other beams with a smooth phase [2,3].…”

mentioning

confidence: 99%

“…Filamentation of laser radiation is a phenomenon of formation of a long spatiotemporal structure with high power density [1]. Femtosecond filamentation has been widely studied for Gaussian and other beams with a smooth phase [2,3].…”

mentioning

confidence: 99%

“…where ̂ is operator of wave nonstationarity [1], describing self-steepening of wave front, ̂ -dispersion operator, which is calculated in spectral domain according to Sellmeyer's formula. The model takes into account beam diffraction and pulse dispersion, Kerr's and plasma nonlinearities, Bremsstrahlung effect, nonlinear absorption and extinction, avalanche ionization and electron recombination.…”

mentioning

confidence: 99%

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Femtosecond filamentation of optical vortex in a medium with anomalous group velocity dispersion

2017

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Abstract. Within the framework of the slowly varying wave approximation method, the pictures of spatio-temporal dynamics of femtosecond pulse in a ring beam with phase singularity were obtained during propagation in CaF2 crystal with anomalous group velocity dispersion. We show formation of tubular structure of the beam and explain reasons of its appearance. Fluence and linear plasma concentration dependencies on propagation distance are analyzed.Filamentation of laser radiation is a phenomenon of formation of a long spatiotemporal structure with high power density [1]. Femtosecond filamentation has been widely studied for Gaussian and other beams with a smooth phase [2,3]. Filamentation of circular beams with phase dislocations can be promising for such applications as tubular refractive index micromodifications, electrons accelerations, etc [4]. We have numerically investigated the filamentation of a femtosecond laser pulse in fused silica for the case of an annular beam with a phase singularity at a wavelength of 800 nm [5]. In this paper, we study propagation of a pulse in mid-IR in circular beam with phase dislocation in presence of anomalous group velocity dispersion typical for calcium fluorides.A numerical simulation of the problem was performed based on the system of differential equations for the slowly varying complex envelope of laser field ( , , ) and free-carrier concentration ( , , ):where ̂ is operator of wave nonstationarity [1], describing self-steepening of wave front, ̂ -dispersion operator, which is calculated in spectral domain according to Sellmeyer's formula. The model takes into account beam diffraction and pulse dispersion, Kerr's and plasma nonlinearities, Bremsstrahlung effect, nonlinear absorption and extinction, avalanche ionization and electron recombination.The initial condition represents a circular beam with located in the center phase dislocation in transform-limited Gaussian pulse.

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Filamentation of high-power femtosecond laser radiation

Cited by 268 publications

References 298 publications

Ultrafast supercontinuum generation in bulk condensed media

Ultrafast supercontinuum generation in bulk condensed media

Ultrafast light-matter interaction in transparent medium

Femtosecond filamentation of optical vortex in a medium with anomalous group velocity dispersion

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