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Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios
- Source :
- Phys. Rev. Lett. 119, 235001 (2017)
- Publication Year :
- 2017
-
Abstract
- In the widely-studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at $\omega_2/\omega_1=$1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of $\omega_2/\omega_1=$1:4 and 2:3. We observe that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization and the polarization adjustment becomes inefficient by rotating the other laser polarization; the THz energy shows similar scaling laws with different frequency ratios. These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.<br />Comment: 6 pages, 3 figures
- Subjects :
- Physics - Plasma Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 119, 235001 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1710.06998
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.119.235001