期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 116, 期 10, 页码 3994-3999出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1815256116
关键词
laser-plasma interaction; terahertz radiation; coherent transition radiation; extreme terahertz science
资金
- National Nature Science Foundation of China [11520101003, 11827807, 11861121001]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB16010200, XDB07030300]
- National Key R&D Program of China [2018YFA0404801]
- Newton UK grant
- National Postdoctoral Program for Innovative Talents [BX201600106]
- Engineering and Physical Sciences Research Council [EP/R006202/1, EP/K022415/1]
- EPSRC [EP/L000644/1, 1694401, EP/R006202/1] Funding Source: UKRI
- STFC [ST/P002056/1] Funding Source: UKRI
Ultrahigh-power terahertz (THz) radiation sources are essential for many applications, for example, THz-wave-based compact accelerators and THz control over matter. However, to date none of the THz sources reported, whether based upon large-scale accelerators or high-power lasers, have produced THz pulses with energies above the millijoule (mJ) level. Here, we report a substantial increase in THz pulse energy, as high as tens of mJ, generated by a high-intensity, picosecond laser pulse irradiating a metal foil. A further up-scaling of THz energy by a factor of similar to 4 is observed when introducing preplasmas at the target-rear side. Experimental measurements and theoretical models identify the dominant THz generation mechanism to be coherent transition radiation, induced by the laser-accelerated energetic electron bunch escaping the target. Observation of THz-field-induced carrier multiplication in high-resistivity silicon is presented as a proof-of-concept application demonstration. Such an extremely high THz energy not only triggers various nonlinear dynamics in matter, but also opens up the research era of relativistic THz optics.
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