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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...

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Updated: May 12, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Spatial Phase Coherence in Femtosecond Coherent Raman Scattering.

Ali Hosseinnia1,2, Michele Marrocco3, Francesco Vergari3,4

  • 1RWTH Aachen University, Chair of Optical Diagnostics in Energy, Process and Chemical Engineering, 52062 Aachen, Germany.

Physical Review Letters
|May 11, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces spatial phase coherence as a new method for femtosecond laser spectroscopy, offering novel insights beyond traditional temporal measurements. This approach reveals distortions in conventional data and enables new applications like thermometry and imaging.

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Area of Science:

  • Laser spectroscopy
  • Coherent phenomena
  • Nonlinear optics

Background:

  • Conventional femtosecond laser spectroscopy relies on temporal phase coherence.
  • Existing methods use time- or frequency-resolved techniques.
  • Limitations exist in detecting spatial phase information.

Purpose of the Study:

  • To propose and validate an experimental framework based on spatial phase coherence for femtosecond laser spectroscopy.
  • To explore the potential of spatial phase coherence in analyzing molecular dynamics and enabling new applications.
  • To investigate the impact of spatial phase coherence on signal generation and detection.

Main Methods:

  • Utilizing the spectral dispersion of wave vectors in femtosecond pulses.
  • Analyzing the transverse spatial distribution of third-order signals from rotational Raman coherence in air.
  • Comparing results with conventional time-resolved measurements.

Main Results:

  • Spatial phase coherence reveals apparent temporal shifts and distortions missed by conventional methods.
  • Demonstrated sensitivity of spatial phase coherence to temperature variations for thermometric applications.
  • Observed novel signal characteristics arising from the interplay of spatial and temporal dynamics.

Conclusions:

  • Spatial phase coherence offers a novel and powerful approach to femtosecond laser spectroscopy.
  • This method provides a new perspective on signal generation and analysis, overcoming limitations of temporal measurements.
  • Opens avenues for advanced applications including single-shot detection, Raman coherence imaging, and molecular quantification.