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High-order harmonic generation using a high-repetition-rate turnkey laser.

E Lorek1, E W Larsen1, C M Heyl1

  • 1Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.

The Review of Scientific Instruments
|January 3, 2015
PubMed
Summary
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Researchers generated high-order harmonics using a user-friendly laser system. This advancement enables coherent extreme ultraviolet pulses for new scientific applications at high repetition rates.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Laser Physics

Background:

  • High-order harmonic generation (HHG) is a crucial process for producing coherent extreme ultraviolet (XUV) and soft X-ray radiation.
  • Traditional HHG experiments often operate at lower repetition rates, limiting their applicability in certain research areas.
  • Advancements in laser technology are enabling higher pulse repetition rates, potentially expanding the scope of HHG applications.

Purpose of the Study:

  • To demonstrate the generation of high-order harmonics at high pulse repetition rates using a turnkey laser system.
  • To explore the performance of HHG in different target gases (argon and neon) at various repetition rates.
  • To quantify the photon flux achieved in HHG experiments at high repetition rates.

Main Methods:

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  • Utilized a turnkey laser system for high-order harmonic generation.
  • Employed argon as the target gas to achieve harmonics at 400 kHz.
  • Used neon as the target gas to generate photons exceeding 90 eV at 20 kHz.
  • Measured photon flux using appropriate detection methods.

Main Results:

  • Successfully generated high-order harmonics at repetition rates of 400 kHz (argon) and 20 kHz (neon).
  • Achieved photon energies greater than 90 eV (approximately 13 nm) in neon.
  • Measured a maximum photon flux of 4.4 × 10^10 photons per second per harmonic in argon at 100 kHz.
  • Demonstrated user-friendly operation of the laser system.

Conclusions:

  • The development of high-repetition-rate HHG opens new avenues for research.
  • The user-friendly system facilitates broader adoption of coherent XUV pulses in scientific experiments.
  • This technology has the potential to drive innovation in fields requiring advanced light sources.