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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

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Anti-Stokes Raman conversion in silicon waveguides.

R Claps, V Raghunathan, D Dimitropoulos

    Optics Express
    |May 28, 2009
    PubMed
    Summary

    Researchers report the first parametric down-conversion in silicon, achieving wavelength conversion via Coherent Anti-Stokes Raman Scattering (CARS). This breakthrough enables new possibilities for silicon photonics applications.

    Area of Science:

    • Photonics
    • Materials Science
    • Nonlinear Optics

    Background:

    • Parametric down-conversion is a key process in nonlinear optics.
    • Silicon photonics offers advantages for integrated optical devices.
    • Previous demonstrations of parametric down-conversion have been limited to other materials.

    Purpose of the Study:

    • To report the first observation of parametric down-conversion in silicon.
    • To investigate the mechanism and efficiency of this process in a silicon waveguide.

    Main Methods:

    • Utilized a continuous-wave (CW) pump laser at 1427 nm.
    • Achieved wavelength conversion from 1542.3 nm to 1328.8 nm.
    • Investigated the role of Coherent Anti-Stokes Raman Scattering (CARS) and phase mismatch.

    More Related Videos

    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

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
    12:21

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

    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

    Main Results:

    • Demonstrated parametric down-conversion in silicon via CARS.
    • Measured a maximum Stokes/anti-Stokes power conversion efficiency of 1x10-5.
    • Identified dependence of efficiency on pump power, Stimulated Raman Scattering (SRS) coefficient, waveguide dispersion, and phase mismatch.

    Conclusions:

    • Parametric down-conversion is feasible in silicon.
    • The efficiency is significantly influenced by phase matching conditions within the waveguide.
    • This finding opens avenues for novel silicon-based photonic devices.