# Quasi phase matching for high order harmonic generation induced by the carrier-envelope phase

## TL;DR

This paper introduces a new quasi-phase matching method for high-order harmonic generation using few-cycle pulsed Bessel beams, enabling control over phase matching and significantly enhancing the XUV power spectrum.

## Contribution

It presents a novel technique leveraging pulse envelope and phase velocity control in Bessel beams for improved phase matching in high-order harmonic generation.

## Key findings

- Achieved nearly two decades enhancement in XUV power spectrum.
- Demonstrated control of carrier-envelope phase during propagation.
- Validated the method through numerical simulations.

## Abstract

We report a novel quasi-phase matching technique for high-order harmonic generation in low-density gases. Numerical simulations show that in few-optical cycle pulsed Bessel beams it is possible to control the pulse envelope and phase velocities which in turn allows to control the carrier-envelope phase during propagation. The resulting oscillations in the peak intensity allow to phase-match the high-order harmonic generation process with a nearly two decade enhancement in the XUV power spectrum.