Spectral phase interferometry for direct electric-field reconstruction of synchrotron radiation

TL;DR

This paper demonstrates a method using spectral phase interferometry (SPIDER) to directly reconstruct the electric field of ultraviolet and extreme ultraviolet radiation emitted by relativistic electrons in a synchrotron, enabling detailed waveform analysis.

Contribution

It introduces a novel application of SPIDER for characterizing synchrotron radiation waveforms, achieving direct electric-field reconstruction of 10-cycle pulses.

Findings

Successfully reconstructed a 10-cycle electric field waveform.

Demonstrated the method's applicability to ultraviolet and extreme ultraviolet radiation.

Provided detailed waveform analysis of synchrotron radiation from an undulator.

Abstract

Ultraviolet and extreme ultraviolet electric-fields produced by relativistic electrons in an undulator of a synchrotron light source are characterized by using spectral phase interferometry for direct electric-field reconstruction (SPIDER). A tandem undulator with a phase shifter produces a pair of wavelength shifted wave packets with some delay. The interferogram between the pair of the wave packets is analyzed with a SPIDER algorithm, which is widely used for ultrashort pulse characterization. As a result, a 10-cycle square shaped electric-field is reconstructed. The waveform corresponds to the radiation from an electron accelerated with the undulator which consists of 10 periods of permanent magnets.