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Proceedings Paper

Tunable terahertz radiation from an ultrashort-laser-pulse-induced discharge in biased air
Author(s): Fuminori Suzuki; Hiroaki Anno-Kashiwazaki; Jun Miyazawa; Shohei Ono; Takeshi Higashiguchi; Noboru Yugami; Yasuhiko Sentoku; Ryosuke Kodama; Patric Muggli
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Paper Abstract

Strong beams of coherent radiation are essential to induce nonlinear excitation phenomena in biology and material sciences. Optical-field-induced ionization by an ultrashort laser pulse produces ultrabroadband bursts of radiation with photon energies ranging from radio-wave at the microsecond timescale to x-ray at the attosecond timescale. As the laser pulse drives an ultrafast-discharge with high current it induces nonlinear spectral conversion in a few femtoseconds and generates terahertz electromagnetic waves. Broadband terahertz generation has been reported in air and rare gases. If the radiation frequency depends on the electron plasma density, it should vary with the laser pulse intensity, and the kind and density of the gas. However, the peak radiation frequencies reported are almost independent of those parameters. From the laser-gas interaction point of view, the terahertz generation mechanism is not enough understood. We demonstrate a frequency-tuning scheme that uses the laser pulse duration to control the ultrafast-discharge current timescale, yielding a terahertz energy of 0.1 μJ and a conversion efficiency of 10-4 by use of the homemade power supply with 60-A discharge current at 1 kHz. We also propose a simple physical model to explain the generation of terahertz radiation with the laser propagation in an ultrafast-discharge.

Paper Details

Date Published: 7 September 2011
PDF: 9 pages
Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 81190M (7 September 2011); doi: 10.1117/12.892902
Show Author Affiliations
Fuminori Suzuki, Utsunomiya Univ. (Japan)
Hiroaki Anno-Kashiwazaki, Utsunomiya Univ. (Japan)
Jun Miyazawa, Utsunomiya Univ. (Japan)
Shohei Ono, Utsunomiya Univ. (Japan)
Takeshi Higashiguchi, Utsunomiya Univ. (Japan)
Japan Science and Technology Agency (Japan)
Noboru Yugami, Utsunomiya Univ. (Japan)
Japan Science and Technology Agency (Japan)
Yasuhiko Sentoku, Univ. of Nevada, Reno (United States)
Ryosuke Kodama, Japan Science and Technology Agency (Japan)
Osaka Univ. (Japan)
Patric Muggli, The Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 8119:
Terahertz Emitters, Receivers, and Applications II
Manijeh Razeghi; Nicolas Péré-Laperne; Henry O. Everitt; John M. Zavada; Tariq Manzur, Editor(s)

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