A solid-state high harmonic generation spectrometer with cryogenic cooling

Finn Kohrell; Bailey R Nebgen; Jacob A Spies; Richard Hollinger; Alfred Zong; Can Uzundal; Christian Spielmann; Michael Zuerch

doi:10.1063/5.0174407

A solid-state high harmonic generation spectrometer with cryogenic cooling

Rev Sci Instrum. 2024 Feb 1;95(2):023906. doi: 10.1063/5.0174407.

Authors

Finn Kohrell^{1

2}, Bailey R Nebgen^{2

3}, Jacob A Spies^{2

3}, Richard Hollinger^{1

2}, Alfred Zong^{2

3}, Can Uzundal², Christian Spielmann¹, Michael Zuerch^{2

3}

Affiliations

¹ Institute for Optics and Quantum Electronics, Friedrich Schiller University Jena, 07743 Jena, Germany.
² Department of Chemistry, University of California, Berkeley, California 94720, USA.
³ Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

PMID: 38416040
DOI: 10.1063/5.0174407

Abstract

Solid-state high harmonic generation (sHHG) spectroscopy is a promising technique for studying electronic structure, symmetry, and dynamics in condensed matter systems. Here, we report on the implementation of an advanced sHHG spectrometer based on a vacuum chamber and closed-cycle helium cryostat. Using an in situ temperature probe, it is demonstrated that the sample interaction region retains cryogenic temperature during the application of high-intensity femtosecond laser pulses that generate high harmonics. The presented implementation opens the door for temperature-dependent sHHG measurements down to a few Kelvin, which makes sHHG spectroscopy a new tool for studying phases of matter that emerge at low temperatures, which is particularly interesting for highly correlated materials.