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

TL;DR

This paper demonstrates high-order harmonic generation at high repetition rates using a user-friendly turnkey laser, enabling new applications in coherent extreme ultraviolet research.

Contribution

It introduces a practical method for high-order harmonic generation at high repetition rates with a turnkey laser system, expanding potential research applications.

Findings

Harmonics observed at 400 kHz in argon

Photon energies exceeding 90 eV at 20 kHz in neon

Photon flux of 4.4×10^{10} photons/sec per harmonic at 100 kHz

Abstract

We generate high-order harmonics at high pulse repetition rates using a turnkey laser. High-order harmonics at 400 kHz are observed when argon is used as target gas. In neon we achieve generation of photons with energies exceeding 90 eV ($\sim$13 nm) at 20 kHz. We measure a photon flux of 4.4$\cdot10^{10}$ photons per second per harmonic in argon at 100 kHz. Many experiments employing high-order harmonics would benefit from higher repetition rates, and the user-friendly operation opens up for applications of coherent extreme ultra-violet pulses in new research areas.