Journal
OPTICS LETTERS
Volume 27, Issue 21, Pages 1944-1946Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.27.001944
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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. (C) 2002 Optical Society of America.
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