Abstract
High-harmonic generation (HHG) is a powerful tool to generate coherent attosecond light pulses in the extreme ultraviolet. However, the low conversion efficiency of HHG at the single atom level poses a significant practical limitation for many applications. Enhancing the efficiency of the process defines one of the primary challenges in the application of HHG as an advanced XUV source. In this work, we demonstrate a new mechanism, which in contrast to current methods, enhances the HHG conversion efficiency purely on a single particle level. We show that using a bichromatic driving field, sub-optical-cycle control and enhancement of the tunnelling ionization rate can be achieved, leading to enhancements in HHG efficiency by up to two orders of magnitude. Our method advances the perspectives of HHG spectroscopy, where isolating the single particle response is an essential component, and offers a simple route toward scalable, robust XUV sources.
Highlights
Advancements in high harmonic generation (HHG) have led to the development of table-top XUV light sources with applications ranging from ultrafast spectroscopy, X-ray science, and high resolution imaging
In this work we demonstrate a robust enhancement of the HHG yield purely obtained at the microscopic, single particle level [2]
HHG spectroscopy relies on a single particle response, mapping the dynamical properties of the interacting electronic wavefunction into the HHG spectrum
Summary
Advancements in high harmonic generation (HHG) have led to the development of table-top XUV light sources with applications ranging from ultrafast spectroscopy, X-ray science, and high resolution imaging. Increasing the HHG flux typically involves a careful optimization of the macroscopic aspects of the interaction via phase matching control [1]. While such approaches have successfully enhanced the HHG signal, they all share a common property – the optimization is achieved on a macroscopic level. In this work we demonstrate a robust enhancement of the HHG yield purely obtained at the microscopic, single particle level [2]. We present a microscopic scheme that defines a single, controllable parameter – namely the ionization probability – to manipulate the HHG yield, providing a robust and scalable approach to circumvent the primary bottleneck in a broad range of HHG applications
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