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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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
The Phase Rule01:20

The Phase Rule

The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Related Experiment Video

Updated: May 11, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

The phase-controlled Raman effect.

A A Lanin1, I V Fedotov, A B Fedotov

  • 1International Laser Center, Physics Department M V Lomonosov MSU, Moscow, Russia.

Scientific Reports
|May 31, 2013
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate precise control over coherent Raman scattering phase using tailored laser pulses. This breakthrough enhances weak Raman signals, advancing nonlinear Raman imaging and microspectroscopy applications.

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Area of Science:

  • Nonlinear Optics
  • Spectroscopy
  • Quantum Optics

Background:

  • Spontaneous Raman scattering lacks phase coherence, limiting signal intensity and directionality.
  • Nonlinear Raman scattering offers phase-defined signals, enabling coherent beam generation.
  • Controlling the phase of nonlinear Raman scattering is crucial for advanced applications.

Purpose of the Study:

  • To demonstrate accurate phase control of coherent Raman scattering.
  • To enhance the coherent response from weak Raman modes.
  • To address challenges in nonlinear Raman imaging and microspectroscopy.

Main Methods:

  • Utilizing spectrally and temporally tailored optical driver fields.
  • Employing spectrally optimized, phase-tunable laser pulses.
  • Observing interference between coherent Raman signals and nonresonant four-wave mixing fields.

Main Results:

  • Achieved precise control and fine-tuning of coherent Raman scattering phase.
  • Observed Fano-type profiles with a distinct destructive-interference dip.
  • Demonstrated significant enhancement of the coherent response from weak Raman modes.

Conclusions:

  • Phase control of coherent Raman scattering is achievable with tailored optical fields.
  • This method overcomes limitations of spontaneous Raman scattering.
  • The demonstrated phase-control strategy offers a powerful tool for nonlinear Raman spectroscopy and imaging.