Strong-field approximation for high-harmonic generation in infrared laser pulses in the accelerated Kramers-Henneberger frame

TL;DR

This paper develops a strong-field approximation framework for high-harmonic generation in infrared laser pulses using the accelerated Kramers-Henneberger frame, providing new insights into the physical mechanisms involved.

Contribution

It introduces a novel formulation of the strong-field approximation in the Kramers-Henneberger frame, contrasting it with traditional gauges and enhancing understanding of high-harmonic generation.

Findings

High-harmonic spectra for atomic hydrogen are calculated.

The physical interpretation differs from the three-step model.

The approach offers a new perspective on the underlying physics.

Abstract

The strong-field approximation for high-harmonic generation in near-infrared and infrared laser pulses is formulated in the accelerated Kramers-Henneberger frame. The accompanying physical picture is discussed and the nature of the leading-order term is contrasted with that of the three-step model following the strong-field-approximation formulation in the length or velocity gauges. The theory is illustrated by high-harmonic generation spectra for atomic hydrogen.