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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Measuring small absorptions by exploiting photothermal self-phase modulation.

Nico Lastzka1, Jessica Steinlechner, Sebastian Steinlechner

  • 1Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstrasse 38, 30167 Hannover, Germany.

Applied Optics
|October 2, 2010
PubMed
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This study introduces a novel method to measure small optical absorption coefficients by analyzing cavity Airy peak deformation. This technique accurately quantifies material absorption, even at very low levels.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • Accurate measurement of small optical absorption coefficients is crucial for advanced optical materials.
  • Existing methods may lack sensitivity for detecting ultra-low absorption.

Purpose of the Study:

  • To develop and validate a new, highly sensitive method for measuring small optical absorption coefficients.
  • To apply the method to a specific material, lithium niobate doped with magnesium oxide.

Main Methods:

  • Exploiting cavity Airy peak deformation caused by photothermal effects (thermorefractive and thermal expansion).
  • Utilizing time-resolved measurements compared with numerical time-domain simulations (Markov-chain Monte Carlo).

Main Results:

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  • Successfully measured the optical absorption coefficient of 7 mol.% magnesium oxide doped lithium niobate (α(LN) = (5.9 ± 0.9) × 10⁻⁴/cm).
  • Demonstrated the method's potential for measuring coefficients as low as 10⁻⁸/cm with high-finesse cavities.

Conclusions:

  • The developed method offers high sensitivity for measuring small optical absorption coefficients.
  • This technique is applicable to a wide range of materials, including those with ultra-low absorption.