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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.8K
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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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Related Experiment Video

Updated: Mar 31, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Multiwavelength ultrafast LiNbO(3) Raman laser.

Aravindan M Warrier, Jipeng Lin, Helen M Pask

    Optics Express
    |October 20, 2015
    PubMed
    Summary

    This study introduces a novel lithium niobate laser generating multiple wavelengths using polariton and Raman scattering. The ultrafast laser system efficiently produces new wavelengths, including terahertz output.

    Area of Science:

    • Photonics and Laser Technology
    • Nonlinear Optics
    • Materials Science

    Background:

    • Lithium niobate is a key material for nonlinear optical applications.
    • Generating multiple wavelengths from a single laser source is crucial for various scientific fields.
    • Ultrafast lasers offer high peak power for nonlinear processes.

    Purpose of the Study:

    • To develop a multiwavelength ultrafast laser system based on lithium niobate.
    • To utilize polariton and Raman scattering for selective wavelength generation.
    • To achieve efficient generation of new wavelengths and terahertz output.

    Main Methods:

    • Employing a lithium niobate crystal within a laser cavity.
    • Utilizing stimulated polariton scattering (SPS) and stimulated Raman scattering (SRS).

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  • Cascading intracavity fields to generate additional wavelengths.

    • Main Results:

    • Generation of 1123 nm via SPS and 1140 nm via SRS from a 1064 nm pump laser.
    • Cascading of generated fields produced 1155 nm and 1174 nm wavelengths.
    • Successful generation of terahertz (THz) output.

    Conclusions:

    • The developed laser system demonstrates efficient multiwavelength generation using nonlinear optical processes in lithium niobate.
    • The combination of SPS and SRS provides a versatile method for tuning laser output.
    • This technology opens possibilities for new applications in spectroscopy and optical communications.