Determination of Carrier-Envelope Phase of Relativistic Few-Cycle Laser Pulses by Thomson Backscattering Spectroscopy

TL;DR

This paper introduces a new method to determine the carrier-envelope phase of relativistic few-cycle laser pulses by analyzing the central frequency of light produced through Thomson backscattering, supported by theoretical and simulation results.

Contribution

A novel approach using Thomson backscattering to accurately measure the CEP of relativistic few-cycle laser pulses.

Findings

Central frequency of TBS light depends on CEP.

Method verified by 1D-PIC simulations.

Potential for precise CEP measurement in relativistic regimes.

Abstract

A novel method is proposed to determine the carrier-envelope phase (CEP) of a relativistic few-cycle laser pulse via the central frequency of the isolated light generated from Thomson backscattering (TBS). We theoretically investigate the generation of a uniform flying mirror when a few-cycle drive pulse with relativistic intensity ($I > 10^{18} {{\rm{W}} \mathord{/ {\vphantom {{\rm{W}} {{\rm{cm}}^{\rm{2}}}}}. \kern-\nulldelimiterspace} {{\rm{cm}}^{\rm{2}}}}$) interacts with a target combined with a thin and a thick foil. The central frequency of the isolated TBS light generated from the flying mirror shows a sensitive dependence on the CEP of the drive pulse. The obtained results are verified by one dimensional particle in cell (1D-PIC) simulations.