G. Valiulis

Vilnius University

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A. Dubietis

Vilnius University

P. Di Trapani

University of Catania

A. Piskarskas

Vilnius University

G. Tamošauskas

Vilnius University

A. Varanavičius

Vilnius University

R. Danielius

Lithuanian Geological Survey

Ottavia Jedrkiewicz

University of Insubria

S. Trillo

University of Ferrara

Stefano Minardi

OSRAM (United States)

J. Trull

Universitat Politècnica de Catalunya

Cooperative Institutions

Vilnius University

University of Insubria

Istituto Nazionale per la Fisica della Materia

National Interuniversity Consortium for the Physical Sciences of Matter

Centre National de la Recherche Scientifique

Politecnico di Milano

Laser Research Institute

University of Milan

École Polytechnique

Istituto di Fotonica e Nanotecnologie

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Spatial-spectral properties of the light filament produced by a visible picosecond laser pulse in air

D. Mikalauskas I. Diomin A. Dubietis G. Valiulis R. Danielius

Summary form only given. We present the experimental investigations of spatial-spectral properties of the light filament produced by focused picosecond 527-nm laser pulse. The laser system is capable of delivering 0.9-ps frequency-doubled pulses. The focusing setup consists of two curved mirrors that allow achieving different effective focal lengths by varying the distance between them. Spatial-spectral measurements were carried out using diffraction grating and CCD camera by taking the front reflection from a wedged fused silica plate inserted at grazing incidence.

Picosecond

Reflection

10.1109/qels.2002.1031232

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Femtosecond Pulse Compression by Sum Frequency Generation in BBO

Springer eBooks (1996)

M. Nisoli S. DeSilvestri G. Valiulis A. Varanavičius

Pulse compression

Photon Upconversion

Crystal (programming language)

10.1007/978-1-4615-5897-2_80

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Citations (1)

Generation of periodic filament arrays by self-focusing of highly elliptical ultrashort pulsed laser beams

Physical Review A (2009)

D. Majus Vytautas Jukna G. Valiulis A. Dubietis

We have studied the spontaneous breakup of highly elliptical laser beams into one- and two-dimensional arrays of light filaments in fused silica. Although the multiple filamentation process is initiated by random intensity modulation across the beam (amplitude noise), the output patterns exhibit a certain periodicity and high shot-to-shot reproducibility. The experimentally observed periodicity of the multiple filament arrays depends on the input beam intensity and this behavior is reproduced in detail by the numerical simulations. With the help of a simple analytical model we propose that the formation of periodic multiple filament structures could be understood within a simple framework of multistep phase-matched four-wave optical parametric amplification.

Filamentation

Self-focusing

10.1103/physreva.79.033843

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Citations (35)

Nonlinear X-waves: light bullets in normally dispersive media?

Claudio Conti P. Di Trapani S. Trillo G. Valiulis Stefano Minardi

Summary form only given. We show that a new type of nondiffracting and nondispersing nonlinear waves exist also for normal group velocity dispersion (GVD). Being the natural eigenmodes of the system, we believe that they are the key to understanding experiments where the diffraction, dispersion, and nonlinear length scales are comparable. Specifically, we consider the usual NLS model which describes the paraxial propagation of pulsed beams in Kerr media. In order to demonstrate the generality of X-waves as space-time localized solutions for normal GVD, we have extended our calculations to second-harmonic generation, where symbiotic two-color X-waves are found.

Harmonic

Group velocity

Velocity dispersion

10.1109/qels.2002.1031177

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Citations (4)

Observation of Temporal Solitons in Second-Harmonic Generation with Tilted Pulses

Physical Review Letters (1998)

P. Di Trapani D. Caironi G. Valiulis A. Dubietis R. Danielius

By eliminating the group-velocity mismatch and enhancing the group-velocity dispersion via pulse-front tilting, we obtained the formation of temporal solitary waves in phase-mismatched second-harmonic generation. Experimental and numerical results match well in a wide range of intensities and $\ensuremath{\Delta}k$'s. In a 7 mm BBO crystal, 58 fs, 527 nm pulses are obtained starting from 200 fs pump, at the same wavelength.

Group velocity

Harmonic

Crystal (programming language)

Phase velocity

10.1103/physrevlett.81.570

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Citations (152)

Generation of high-energy 14.5 fs pulses at 1.5 /spl mu/m by optical parametric amplification

M. Nisoli S. Stagira S. De Silvestri O. Svelto G. Valiulis

Summary form only given. We report on traveling-wave parametric conversion of <20-fs Ti:sapphire laser pulses in type II BBO crystals yielding tunable infrared pulses as short as 14.5 fs with a few microjoules energy at a 1-kHz repetition rate. The choice of the phase-matching type is discussed.

Optical parametric amplifier

Repetition (rhetorical device)

Frequency Conversion

10.1109/cleo.1998.676535

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Filamentation of ultrashort light pulses in a liquid scattering medium

Applied Physics B (2008)

Vytautas Jukna G. Tamošauskas G. Valiulis M. Aputis Mantas Puida

Filamentation

Self-focusing

Multiangle light scattering

10.1007/s00340-008-3255-4

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Citations (16)

Sub-15-fs Pulses at 1.5 µm by Parametric Generation

Conference on Lasers and Electro-Optics Europe (1998)

M. Nisoli S. Stagira S. De Silvestri O. Svelto G. Valiulis

Ultrashort high-energy pulses tunable In the infrared are strongly needed for applications in nonlinear optics and spectroscopy. Sub-100-fs infrared pulses were achieved by traveling- wave optical parametric amplification (OPA) [1-3]. The generation of multi-gigawatt sub-20- fs pump pulses, obtained by the hollow-fiber compression technique [4], offers the possibility to investigate parametric processes in an ultrashort temporal regime.

Optical parametric amplifier

Ultrafast optics

Optical Pumping

Pulse compression

10.1364/cleo_europe.1998.cwh3

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Transformation of the probability density function in an optical parametric amplifier: Application to rogue-wave-like statistics

Optics Communications (2012)

Vytautas Jukna D. Majus G. Valiulis A. Dubietis

Optical parametric amplifier

Supercontinuum

SIGNAL (programming language)

10.1016/j.optcom.2012.04.041

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Citations (2)

Transverse structures in cavity-less parametric amplifier

Nonlinear Guided Waves and Their Applications (1999)

W. Chinaglia Stefano Minardi Samantha Sapone G. Coppo P. Di Trapani

The single-pass (or traveling-wave, or cavity-less) parametric amplifier is a good candidate for achieving the generation and the ultrafast control of transverse structures of large complexity for image processing, switching, addressing, parallel beam processing and several other applications.

Optical parametric amplifier

Parametric oscillator

10.1364/nlgw.1999.wa6

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Citations (1)