Petr M. Solyankin, Irina A. Nikolaeva, Andrew Angeluts, Daniil E. Shipilo, Nikita Minaev, Nikolay A. Panov, Alexey V. Balakin, Yiming Zhu, Olga Kosareva, Alexander P. Shkurinov
https://iopscience.iop.org/article/10.1088/1367-2630/ab60f3/meta
The present paper studies the generation of terahertz (THz) radiation in CO2 in comparison with atmospheric air at a wide range of pressures. We established experimentally and explained theoretically that for these gases there are optimal pressures at about 1 bar for air and 0.5 bar for CO2 under which the efficiency of conversion from near-infrared to THz frequencies is the highest. We consider the possibility of applying femtosecond laser-induced THz generation for the study of the atmosphere of Mars and found that the overall THz yield near the surface of Mars is just a factor of 6 lower than on Earth. Comparable THz energy on the two planets is associated with underdense plasma on Earth (~10% of neutrals) and full double ionization of carbon dioxide on Mars (~200% of neutrals), the latter opening great perspective for THz remote sensing of trace gases in the Martian atmosphere.
No comments:
Post a Comment