Abstract
The spatiotemporal distribution of terahertz (THz) radiation from plasma has been demonstrated with the technology of THz focal-plane imaging. It has been found that the spatiotemporal distribution will vary with the frequency, as well as the length of plasma. A doughnut-shaped distribution appears in the lower frequency range, while the bell-shaped distribution corresponds to the higher frequency range. For plasmas with different lengths, their generated THz images in the time domain are similar, the THz images in the frequency domain as well. The spatiotemporal distributions are simulated with the off-axis-phase matching theory. All the findings will renew the understanding of the THz generation from plasma induced by two-color pulses.
Highlights
Frontiers in PhysicsThe spatiotemporal distribution of terahertz (THz) radiation from plasma has been demonstrated with the technology of THz focal-plane imaging
Terahertz (THz) wave generated from plasma has been proven to be a valuable tool in the field of nonlinear spectroscopy, imaging, and remote sensing [1,2,3]
For the plasmas of the same length, the spatial distribution of THz waves at different frequencies evolves from a doughnut-shape at low frequencies to a bell-shape at high frequencies; For the same frequency, the spatial distribution shape of THz waves radiated from different lengths of plasma is similar, while the intensity decreases with the decrease of plasma length. All these results indicate the accumulation effect of THz waves radiated from plasma
Summary
The spatiotemporal distribution of terahertz (THz) radiation from plasma has been demonstrated with the technology of THz focal-plane imaging. It has been found that the spatiotemporal distribution will vary with the frequency, as well as the length of plasma. A doughnut-shaped distribution appears in the lower frequency range, while the bellshaped distribution corresponds to the higher frequency range. For plasmas with different lengths, their generated THz images in the time domain are similar, the THz images in the frequency domain as well. The spatiotemporal distributions are simulated with the off-axisphase matching theory. All the findings will renew the understanding of the THz generation from plasma induced by two-color pulses
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