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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Cavity-enhanced high-harmonic generation with spatially tailored driving fields.

I Pupeza1, M Högner1, J Weitenberg2

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.

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Summary

This study explores high-harmonic generation using a novel cavity mode, achieving comparable conversion efficiency to Gaussian modes but with superior output coupling. This method enhances power scaling for extreme-ultraviolet frequency combs and attosecond pulse generation.

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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Attosecond science

Background:

  • High-harmonic generation (HHG) is crucial for producing extreme-ultraviolet (XUV) light.
  • Enhancement cavities improve HHG efficiency but often face limitations in output coupling and power scaling.
  • Gaussian beam modes are standard in enhancement cavities, but alternative modes may offer advantages.

Purpose of the Study:

  • To investigate high-harmonic generation using a specific transverse cavity mode.
  • To compare the performance of this mode against the conventional Gaussian mode in terms of conversion and output coupling efficiency.
  • To explore the potential for power scaling and advanced applications like frequency combs and attosecond pulse generation.

Main Methods:

  • Theoretical modeling of high-harmonic generation in a 78-MHz enhancement cavity.
  • Experimental investigation using a cavity mode with on-axis intensity maxima at the focus.
  • Characterization of conversion efficiency and output coupling efficiency.

Main Results:

  • The investigated transverse mode yields conversion efficiency comparable to the Gaussian mode.
  • Output coupling efficiency is significantly improved compared to existing techniques.
  • The approach demonstrates potential for power scaling and flexible control over harmonic emission.

Conclusions:

  • A novel cavity mode enhances output coupling efficiency for high-harmonic generation.
  • This method provides a pathway to high-power extreme-ultraviolet frequency combs.
  • It enables the generation of multi-MHz repetition-rate-isolated attosecond pulses.