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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Photothermal method for absorption measurements in anisotropic crystals.

M Stubenvoll1, B Schäfer1, K Mann1

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Summary

This study presents an advanced measurement system for quantifying photo-thermal absorption in anisotropic materials. The system accurately determines both surface and bulk absorption using a Hartmann-Shack wavefront sensor.

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Area of Science:

  • Optics
  • Materials Science
  • Thermal Analysis

Background:

  • Accurate measurement of photo-thermal absorption is crucial for understanding laser-material interactions.
  • Existing methods often struggle to differentiate between surface and bulk absorption, especially in anisotropic media.
  • Anisotropic optical media present unique challenges due to their directional properties.

Purpose of the Study:

  • To extend a quantitative photo-thermal absorption measurement system to anisotropic optical media.
  • To precisely monitor wavefront deformations caused by laser irradiation.
  • To develop a method for distinguishing and quantifying surface versus bulk absorption losses.

Main Methods:

  • Utilized a highly sensitive Hartmann-Shack wavefront sensor for precise on-line monitoring.
  • Employed a collimated test beam transmitted perpendicularly through laser-irradiated cuboid samples.
  • Calibrated the system using thermal theory to interpret transient wavefront distortions.

Main Results:

  • Successfully extended the measurement system to anisotropic optical media.
  • Quantitatively determined both surface and bulk contributions to photo-thermal absorption.
  • Presented results for KTP (Potassium Titanyl Phosphate) and BBO (Beta Barium Borate) single crystals.

Conclusions:

  • The developed system provides a quantitative measure of absorption losses in anisotropic materials.
  • The method effectively differentiates between surface and bulk absorption.
  • This technique is valuable for characterizing optical materials used in laser applications.