All-Optical Experimental Control of High-Harmonic Photon Energy

TL;DR

This paper demonstrates a method for tuning high-harmonic photon energy using a simple, all-optical approach with double pulses in a non-collinear geometry, enabling flexible extreme ultraviolet sources.

Contribution

It introduces a novel all-optical technique employing time domain interferometry with double pulses for tunable high-harmonic generation.

Findings

Achieved tunable high-harmonic photon energies.

Implemented a wave front splitting split-and-delay unit.

Demonstrated broad applicability in attosecond pulse generation.

Abstract

We generate high-order harmonics in gaseous medium with tunable photon energy using time domain interferometry of double pulses in a non-collinear generation geometry. The method is based on the fact that the generated harmonics inherit certain spectral properties of the driving laser. The two temporally delayed ultrashort laser pulses, identical in all parameters, are produced by a custom-made split-and-delay unit utilizing wave front splitting without a significant energy loss. The arrangement is easy to implement in any attosecond pulse generation beamline, and is suitable for the production of an extreme ultraviolet source with simply and quickly variable central photon energy, useful for a broad range of applications.