Phase-matched coherent hard x-rays from relativistic high-order harmonic generation

Abstract

High-order harmonic generation (HHG) with relativistically strong laser pulses is considered employing electron ionization-recollisions from multiply charged ions in counterpropagating, linearly polarized attosecond pulse trains. The propagation of the harmonics through the medium and the scaling of HHG into the multi-kilo-electronvolt regime are investigated. We show that the phase mismatch caused by the free electron background can be compensated by an additional phase of the emitted harmonics specific to the considered setup which depends on the delay time between the pulse trains. This renders feasible the phase-matched emission of harmonics with photon energies of several tens of kilo-electronvolt from an underdense plasma.

References in corpus (4)

• Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
• Bright, Coherent, Ultrafast Soft X-Ray Harmonics Spanning the Water Window from a Tabletop Light Source
• Relativistic ionization-rescattering with tailored laser pulses
• Coherent hard x-rays from attosecond pulse train-assisted harmonic generation

Cited by in corpus (4)

• Extremely high-intensity laser interactions with fundamental quantum systems
• Attosecond pulses at kiloelectronvolt photon energies from high-order harmonic generation with core electrons
• High harmonic interferometry of the Lorentz force in strong mid-infrared laser fields
• Macroscopic aspects of relativistic x-ray assisted high-order harmonic generation