Superluminal terahertz pulses

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

K Wynne1, D A Jaroszynski

  • 1Femtosecond Research Centre, Department of Physics and Applied Physics, University of Strathclyde, Glasgow G4 0NG, UK.

Optics Letters
|December 12, 2007
PubMed

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.