[PDF]    http://dx.doi.org/10.3952/lithjphys.46101

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 46, 7–18 (2006)

Review

NONLINEAR LOCALIZATION OF LIGHT ∗
A. Dubietis, G. Valiulis, and A. Varanavičius
Department of Quantum Electronics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: audrius.dubietis@ff.vu.lt

Received 1 September 2005

We briefly overview historical, fundamental, and practical aspects of light wave propagation, where strong multidimensional localization and precise control of ultrashort signals is demanded. The main topic is focused on the state of art of recently discovered nonlinear conical waves, or so-called X-shaped light bullets, which have been demonstrated to appear spontaneously in many different, frequently encountered operating regimes in transparent gaseous, liquid, and solid media. Owing to unique features of white-light frequency spectrum, strong localization, deep-field stationarity, and hot-spot regeneration property, nonlinear conical waves have great potential in all applications requiring energy transfer to matter over very limited transverse areas in thick media, which thus suffer the short focal depth of conventional laser beams. Practical applications that cover many different areas ranging from nano-science to high-field physics are discussed.
Keywords: light bullets, X waves and X pulses, Bessel beams, light filaments, conical waves, solitons, self-focusing
PACS: 41.20.Jb, 42.25.Bs, 42.65.Re, 42.65.Jx
∗ The report presented at the 36th Lithuanian National Physics Conference, 16–18 June 2005, Vilnius, Lithuania


NETIESINĖ ŠVIESOS LOKALIZACIJA
A. Dubietis, G. Valiulis, A. Varanavičius
Vilniaus universitetas, Vilnius, Lietuva

Vienas aktualiausių šiuolaikinės optikos uždavinių – rasti būdus ir sąlygas, kaip išvengti itin trumpų bangų paketų (lazerio pluoštų ir impulsų) plėtros, kurią lemia dispersija ir difrakcija. Toks uždavinys yra svarbus tiek fundamentiniu, tiek ir praktiniu požiūriu. Neseniai atrastos netiesinės kūginės X bangos atveria galimybes formuoti naujo tipo sutelktos energijos darinius (šviesos kulkas) ir valdyti jų savybes, vykstant stipriai šviesos sąveikai su medžiaga. Apžvelgti naujausi netiesinės optikos pasiekimai šviesos lokalizacijos srityje, siūlantys naują požiūrį į šviesos saviveikos reiškinius bei išryškinantys laiko ir erdvės reiškinių neatsiejamumą. Aptartos kokybiškai naujų šviesos darinių – netiesinių X bangų (šviesos kulkų) savaiminio radimosi skaidriose medžiagose prielaidos, dėsningumai ir eksperimentinio realizavimo būdai. Unikalios šviesos kulkų savybės – platus dažnių spektras, didelė energijos sankaupa mažame erdvės tūryje ir laiko intervale, sklidimo nuostovumas, taip pat galimybė valdyti jų parametrus – atveria plačias taikymo galimybes ten, kur įprastinių lazerio pluoštų taikymas yra neefektyvus, o kartais net ir sunkiai įmanomas.


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