We report on what is believed to be the first observation of coherent subterahertz (sub-THz) emission from a 1-m string in the atmosphere. The sub-THz pulse emitted by the filamentary structure from an intense IR femtosecond laser pulse is detected perpendicularly to the laser propagation axis by use of two heterodyne detectors at 94 ± 1 and 118 ± 1 GHz. We describe the characteristics of this emission and show evidence of constructive interference between two separate strings.
|Number of pages||3|
|Publication status||Published - 1 Nov 2002|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics