Abstract
The recent advancements and future trends in research on solid-state high harmonic generation (HHG), as well as its current and potential applications, have been introduced in the two review articles [1][2] published in 2022 and 2019 respectively. The research on solid-state HHG is in full swing, so it is natural to think of what liquid-phase HHG is like. Like the solid-state HHG, the measurement of liquid-phase HHG and new experimental phenomena are expected. It is also expected that the measure of liquid-phase HHG can bring us a deeper and more comprehensive understanding of the electronic-structure properties of liquids. The in-depth study of liquids is vital in chemistry, biology, and medicine, so the experiments we're about to conduct are of broader exciting value.
Compared with the research on liquid-phase HHG, which is just beginning, the research on solid-state HHG has been relatively comprehensive. It is natural to apply the experimental techniques and research methods of solid-state HHG to liquid-phase HHG. Applying existing techniques to research liquid samples should be done because it can not only greatly reduce costs, but also advance research on new samples very quickly.
[1] Goulielmakis, E., & Brabec, T. (2022). High harmonic generation in condensed matter. Nature Photonics, 16(6), 411-421.
[2] Ghimire, S., & Reis, D. A. (2019). High-harmonic generation from solids. Nature physics, 15(1), 10-16.
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