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400-photon-per-pulse ultrashort pulse autocorrelation measurement with aperiodically poled lithium niobate waveguides

Shang-Da Yang1, Andrew M Weiner, Krishnan R Parameswaran

  • 1School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907-2035, USA. shangda@purdue.edu

Optics Letters
|October 1, 2004
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.