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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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.
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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...

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Updated: May 27, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Published on: August 6, 2018

Ultrashort pulse characterization with a terahertz streak camera.

O Schubert1, C Riek, F Junginger

  • 1Department of Physics and Center for Applied Photonics, University of Konstanz, Konstanz, Germany.

Optics Letters
|November 18, 2011
PubMed
Summary

Researchers used a terahertz transient as an ultrafast phase gate to precisely measure femtosecond optical pulse dispersion. This method achieves sub-femtosecond temporal resolution without complex reconstruction algorithms.

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Area of Science:

  • Ultrafast Optics and Photonics
  • Terahertz Science and Technology
  • Nonlinear Optics

Background:

  • Characterizing femtosecond optical pulses is crucial for understanding and controlling light-matter interactions.
  • Existing methods for measuring pulse dispersion can be complex or lack the required temporal precision.
  • Terahertz (THz) transients offer unique properties for ultrafast optical manipulation.

Purpose of the Study:

  • To develop and demonstrate a novel method for measuring the group delay dispersion (GDD) of femtosecond optical pulses.
  • To exploit a phase-locked terahertz transient as an ultrafast phase gate for high-precision pulse characterization.
  • To achieve temporal precision better than 1 femtosecond (fs) over a broad spectral range.

Main Methods:

  • Utilized a phase-locked terahertz transient to create an ultrafast electro-optic phase gate.
  • Measured the wavelength-dependent polarization rotation of a low-power near-infrared (NIR) pulse.
  • Covered a spectral window from 1.0 to 1.4 μm, demonstrating broad applicability.

Main Results:

  • Successfully mapped the group delay dispersion of NIR pulses with temporal precision below 1 fs.
  • The electro-optic streaking technique directly yields GDD information without requiring reconstruction algorithms.
  • Validated the technique's suitability for characterizing pulses spanning more than an optical octave.

Conclusions:

  • The demonstrated THz-streaking technique provides a direct, high-precision method for femtosecond pulse characterization.
  • This approach simplifies GDD measurement and is robust for broadband pulse analysis.
  • Offers a powerful new tool for ultrafast science and optical metrology.