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<p>Directional superluminescence on a large number of spectral lines in the wavelength range of 310–470 nm has been obtained during the filamentation of 950-nm femtosecond radiation from a Ti:sapphire laser in carbon dioxide. The lines have been identified as transition lines between the vibrational levels of electron-excited A<sup>2</sup>Π<sub>u</sub> and X<sup>2</sup>Π<sub>g</sub> states of CO<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4272_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(_{2}^{ + }\)</EquationSource> <!--JETPLet2560669Grudtsin-m1--> </InlineEquation> ions. The effect of the pressure on the radiation spectrum has been studied and mechanisms of the observed phenomenon are discussed.</p>

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Superluminescence During the Filamentation of 950-nm Femtosecond Laser Pulses in Carbon Dioxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Ya. V. Grudtsyn,
  • A. A. Ionin,
  • I. O. Kinyaevsky,
  • Yu. M. Klimachev,
  • A. V. Koribut

摘要

Directional superluminescence on a large number of spectral lines in the wavelength range of 310–470 nm has been obtained during the filamentation of 950-nm femtosecond radiation from a Ti:sapphire laser in carbon dioxide. The lines have been identified as transition lines between the vibrational levels of electron-excited A2Πu and X2Πg states of CO \(_{2}^{ + }\) ions. The effect of the pressure on the radiation spectrum has been studied and mechanisms of the observed phenomenon are discussed.