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Related Concept Videos

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...
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...

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Raman scattering temperature probe of laser disk marking.

P K Chan, T R Hart

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers measured laser-induced temperature in dye/polymer optical storage using Raman scattering intensity ratios. This method accurately determined temperature changes on recording films during laser marking experiments.

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    Area of Science:

    • Materials Science
    • Optics
    • Spectroscopy

    Background:

    • Optical data storage relies on material property changes induced by lasers.
    • Accurate temperature measurement is crucial for understanding and optimizing laser-induced marking processes in dye/polymer systems.
    • Non-contact, in-situ temperature monitoring methods are needed for real-time analysis.

    Purpose of the Study:

    • To directly measure laser-induced temperature rise in dye/polymer systems used for optical storage.
    • To validate a novel temperature measurement technique based on Raman scattering.
    • To investigate temperature distribution during laser writing below and at the marking threshold.

    Main Methods:

    • Utilized the intensity ratio of anti-Stokes to Stokes Raman scattered radiations for temperature determination.
    • Employed the writing laser beam itself for collecting Raman scattering data, enabling in-situ measurements.
    • Developed computer simulations of laser-induced temperature distribution and corresponding intensity ratios to extract accurate temperature values.

    Main Results:

    • Successfully obtained direct measurements of laser-induced temperature rise in the dye/polymer system.
    • Demonstrated that the Raman scattering intensity ratio correlates directly with the temperature developed on the recording films.
    • Characterized temperature profiles at various laser powers, including those below the marking threshold.

    Conclusions:

    • The anti-Stokes/Stokes Raman scattering intensity ratio is a viable and direct method for measuring laser-induced temperatures in dye/polymer optical storage media.
    • This technique allows for precise temperature determination during the laser writing process, crucial for optimizing optical storage performance.
    • The findings provide a foundation for developing more controlled and efficient laser-based data recording technologies.