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Related Concept Videos

Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Related Experiment Video

Updated: Jun 16, 2026

Fabrication and Testing of Photonic Thermometers
08:44

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

New thermooptical measurement method and a comparison with other methods.

C Hu, J R Whinnery

    Applied Optics
    |February 4, 2010
    PubMed
    Summary

    A new laser-based method accurately measures low material absorption by detecting thermally induced index changes. This technique offers high sensitivity for analyzing optical materials and nonlinear effects.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Accurate measurement of low absorption coefficients in optical materials is crucial for high-power laser applications.
    • Existing thermal-lens methods have limitations in sensitivity and accuracy for very low absorption levels.

    Purpose of the Study:

    • To develop a simple, sensitive, and accurate method for measuring thermally induced index changes caused by laser beam absorption.
    • To evaluate the method's sensitivity for detecting low absorption coefficients and compare it with existing techniques.

    Main Methods:

    • The proposed method places the sample outside the laser cavity at a specific position relative to the beam waist.
    • It measures thermally induced refractive index changes arising from laser absorption.

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  • The technique is designed to be sensitive to absorption coefficients on the order of 5 x 10^-6 cm^-1.

    • Main Results:

    • Experimental validation demonstrates good accuracy for low-loss materials.
    • The method is estimated to be sensitive enough to measure absorption coefficients as low as 5 x 10^-6 cm^-1.
    • A detailed comparison highlights the sensitivity and accuracy advantages over other published thermal-lens methods.

    Conclusions:

    • The described method provides a simple and highly sensitive approach for measuring low absorption coefficients in optical materials.
    • Its accuracy and sensitivity make it suitable for characterizing low-loss materials.
    • The technique is broadly applicable to other laser-induced nonlinear index changes beyond thermal effects.