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Generation and applications of strong terahertz driven by high intensity lasers
Yutong Li1, and Guoqian Liao1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Recently Terahertz (THz) radiation from laser-produced plasmas has attracted much interest since plasmas can work at arbitrarily high laser intensity. We have systematically studied strong THz radiation from solid targets driven by ultraintense laser pulses. The experiments were performed with femtosecond and picosecond laser facilities, respectively. The energetic MeV fast electron beams accelerated by the high intensity laser pulses are the origin for the THz radiation. When the forward electrons reach the target rear surface, THz radiation can be induced due to transition radiation. We have demonstrated the total energy of THz pulses emitted from the target rear is up to ~200 mJ, giving a peak power upto ~Terawatt, when using 60J ps driving laser beam. Using the femtosecond laser system at the Institute of Physics CAS, a strong terahertz source with peak power exceeding GW is also generated. We have carried out preliminary experiments on nonlinear interaction between strong terahertz fields and matter using those strong THz sources, such as the excitation of biological protein dynamics, water dynamics, and phonons.
References
[1] A. Gopal, et al., 2013 Phys. Rev. Lett. 111, 074802
[2] W. P. Leemans, et al., 2003 Phys. Rev. Lett. 91, 074802
[3] G. Q. Liao, et al., 2016 Phys. Rev. Lett. 116, 205003
[4] G. Q. Liao, et al., 2019 PNAS 116, 3994
[5] G. Q. Liao, et al., 2020 Phys. Rev. X 10, 031062