Abstract
We present a novel method for controlling the transverse positions and relative powers of multiple high-order harmonic beams. A phase-only spatial light modulator is used to produce multiple infrared foci, the positions and intensities of which can be controlled programmably, enabling the generation and control of multiple HHG beams. To demonstrate the utility of this method we perform Fourier transform holography with separate illumination of the object and reference pinhole by a pair of HHG beams, which makes optimal use of the available photon flux. The programmable control of the spatial distribution of HHG beams demonstrated here offers new opportunities for experiments at extreme ultraviolet (XUV) wavelengths, particularly for photon intensive applications such as imaging.
Highlights
High harmonic generation (HHG) driven by tabletop laser systems has emerged as an accessible method for generating coherent radiation in the vacuum ultraviolet (VUV) and soft x-ray (SXR) spectral regions [1]
The potential advantages of this method were demonstrated by Fourier transform holography (FTH) imaging of an object with two, independently-controllable HHG beams
It was found that FTH imaging with two HHG beams yielded reconstructed images with superior S:N than equivalent imaging with a single beam
Summary
High harmonic generation (HHG) driven by tabletop laser systems has emerged as an accessible method for generating coherent radiation in the vacuum ultraviolet (VUV) and soft x-ray (SXR) spectral regions [1]. HHG has proven to be a valuable tool for high temporal and spatial resolution imaging many applications are limited by the low conversion efficiency of infrared to harmonic photons. This typically restricts harmonic sources to μW or nW of average power [7,8]. When an absorptive object and transmissive reference feature are illuminated, an imbalance in the illuminating intensity may be required to ensure the amplitudes leaving the rear of both features are comparable This may not be possible with the traditional single Gaussian illuminating beam. We demonstrate that the S:N of the image recovered with two independently controlled beams is superior to that of the image recovered with only one illuminating beam
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