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Abstract <p>The dynamics of interaction between electromagnetic radiation of near infrared range and a space-charge wave (SCW) that propagates in the volume of a semiconductor cylindrical waveguide based on <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11974_2025_8423_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(n\)</EquationSource> <!--OptelIns2570001Abramov-m1--> </InlineEquation>-GaAs has been considered. The possibility of phase modulation of the decelerated electromagnetic wave of ‘‘whispering gallery’’ type with a depth from 10 to 30 rad has been demonstrated. It has been shown that during further propagation in the optical waveguide, the phase-modulated radiation become split into a sequence of ultrashort pulses with a repetition frequency coinciding with the frequency of the SCW realized in the waveguide. It has been revealed that the peak power of the formed pulses exceeds the average power of the input radiation approximately by three orders of magnitude and can reach 20–50 W. The optimal length at which optical pulse formation occurs outside the waveguide significantly depends on the amplitude and frequency of modulation of the free charge carrier concentration that is related to the propagating SCW.</p>

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Generation of Optical Pulses from Phase-Modulated Wave Enforced in a Cylindrical Waveguide by a Traveling Space-Charge Wave

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. S. Abramov,
  • I. O. Zolotovskii,
  • V. A. Lapin,
  • S. G. Moiseev,
  • D. G. Sannikov

摘要

Abstract

The dynamics of interaction between electromagnetic radiation of near infrared range and a space-charge wave (SCW) that propagates in the volume of a semiconductor cylindrical waveguide based on \(n\) -GaAs has been considered. The possibility of phase modulation of the decelerated electromagnetic wave of ‘‘whispering gallery’’ type with a depth from 10 to 30 rad has been demonstrated. It has been shown that during further propagation in the optical waveguide, the phase-modulated radiation become split into a sequence of ultrashort pulses with a repetition frequency coinciding with the frequency of the SCW realized in the waveguide. It has been revealed that the peak power of the formed pulses exceeds the average power of the input radiation approximately by three orders of magnitude and can reach 20–50 W. The optimal length at which optical pulse formation occurs outside the waveguide significantly depends on the amplitude and frequency of modulation of the free charge carrier concentration that is related to the propagating SCW.