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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Related Experiment Video

Updated: Jul 12, 2026

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
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Published on: July 17, 2016

Single-pulse coherently controlled nonlinear Raman spectroscopy and microscopy.

Nirit Dudovich1, Dan Oron, Yaron Silberberg

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

Nature
|August 2, 2002
PubMed
Summary

Researchers developed single-pulse vibrational spectroscopy to identify molecules. This method uses quantum coherent control to achieve high spectral resolution, enabling advanced molecular detection and nonlinear microscopy with a single laser beam.

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Area of Science:

  • Spectroscopy
  • Quantum Optics
  • Molecular Physics

Background:

  • Molecular vibrations serve as unique fingerprints for molecular identification.
  • Current nonlinear spectroscopy methods require multiple laser beams.
  • Ultrashort optical pulses allow for coherent excitation of molecular vibrations.

Purpose of the Study:

  • To develop a single-pulse vibrational spectroscopy technique.
  • To achieve high spectral resolution in single-pulse spectroscopy.
  • To demonstrate the application of this technique in nonlinear microscopy.

Main Methods:

  • Utilizing ultrashort (femtosecond) optical pulses for excitation and readout.
  • Employing quantum coherent control techniques to modulate spectral phase.
  • Exploiting quantum interference for selective vibrational level population and probing.

Main Results:

  • Demonstrated single-pulse vibrational spectroscopy on liquid-phase molecules.
  • Achieved spectral resolution two orders of magnitude better than pulse bandwidth.
  • Successfully constructed a single-beam coherent anti-Stokes Raman (CARS) microscope.

Conclusions:

  • Single-pulse vibrational spectroscopy offers a simplified and efficient approach.
  • Quantum coherent control is key to achieving high spectral resolution.
  • This technique has significant potential for nonlinear microscopy applications.