According to the Institute of Physics and Mathematics, Chinese Academy of Sciences, Institute of Physics and Mathematics, Yan Xuebin Group, higher harmonics are coherent high-frequency ultra-short pulses that radiate from a strong field ultrafast laser after interacting with atomic molecules or solids. They are strong field ultrafast physics at home and abroad. Research hotspots.
In response to this important basic physics problem, Yan Xuebin’s research team cooperated with the ultrafast optical laboratory led by Prof. Lu Peixiang of Huazhong University of Science and Technology to combine theories with experiments and ruled out possible factors affecting frequency modulation. The isotope molecule H 2 was observed. The frequency shift of the higher harmonic spectrum caused by the D 2 nuclear vibration, and the time-resolved isotope molecular vibration dynamics detection of the femtosecond time on the sub-angstrom space scale is realized based on the experimentally observed frequency shift.
This work lays the foundation for the use of higher-order harmonic frequency modulation to detect molecular structures and the ultra-fast kinetics of more complex molecules, and can be further used to detect chemical reaction processes in real time. At the same time, this research is based on the realization of high-order harmonics. The continuous adjustment of the photon energy of Wave's ultra-fast light source provides a practical solution. The research results have recently been published in Nature Communications.