XUV digital in-line holography using high-order harmonics

TL;DR

This paper demonstrates the use of high-order harmonic generated XUV pulses for digital in-line holography, achieving micrometer to hundreds of nanometers resolution, with potential for ultrafast, high-resolution imaging.

Contribution

It introduces a novel implementation of XUV digital in-line holography using high-order harmonics and demonstrates its capability for high-resolution imaging.

Findings

Recorded holograms of thin wires successfully.

Achieved micrometer resolution range.

Potential for spatial resolution of a few hundred nanometers.

Abstract

A step towards a successful implementation of timeresolved digital in-line holography with extreme ultraviolet radiation is presented. Ultrashort XUV pulses are produced as high-order harmonics of a femtosecond laser and a Schwarzschild objective is used to focus harmonic radiation at 38 nm and to produce a strongly divergent reference beam for holographic recording. Experimental holograms of thin wires are recorded and the objects reconstructed. Descriptions of the simulation and reconstruction theory and algorithms are also given. Spatial resolution of few hundreds of nm is potentially achievable, and micrometer resolution range is demonstrated.