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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...

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Related Experiment Video

Updated: Jun 22, 2026

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering
09:13

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Published on: July 6, 2019

Mode locking using stimulated Raman scattering.

David J Spence, Richard P Mildren

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new type of mode locking was discovered in fiber lasers using Raman-shifting fiber. This backward stimulated Raman scattering mechanism can generate stable picosecond pulses and may apply to crystalline Raman lasers.

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

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    Last Updated: Jun 22, 2026

    Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering
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    Published on: July 6, 2019

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
    09:57

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

    Published on: July 25, 2022

    Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
    09:57

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

    Published on: February 10, 2020

    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Continuous-wave (cw) pumped fiber lasers can generate stable pulse trains.
    • Raman-shifting fiber added to laser cavities can induce pulsed operation.

    Purpose of the Study:

    • To investigate the mechanism behind stable pulse generation in fiber lasers with added Raman-shifting fiber.
    • To demonstrate a novel mode-locking mechanism driven by backward stimulated Raman scattering.
    • To explore the applicability of this mechanism to crystalline Raman laser systems.

    Main Methods:

    • Numerical modeling of a cw-pumped fiber laser cavity containing Raman-shifting fiber.
    • Analysis of the stimulated Raman scattering process within the laser cavity.

    Main Results:

    • The study identified a new mode-locking regime driven by backward stimulated Raman scattering.
    • Stable generation of a pulse train was numerically confirmed.
    • The proposed mechanism shows potential for creating novel picosecond oscillators.

    Conclusions:

    • Backward stimulated Raman scattering provides a novel mechanism for mode locking in fiber lasers.
    • This technique enables stable generation of picosecond pulse trains.
    • The discovered mode-locking principle is potentially transferable to crystalline Raman laser systems.