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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 56,
  • Issue 11,
  • pp. 1504-1507
  • (2002)

Thermal Lensing in Extended Samples

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Abstract

We report on a novel pump-probe thermal-lens method for the measurement of absorption in extended samples using nearly collimated continuous wave (CW) and low-power probe and pump beams. We report the measurement of the absorption of a column of distilled water up to 2 meters thick. The method allows the determination of the absorption with sensitivities up to 10<sup>-10</sup> W cm<sup>-1</sup> in materials with photothermal parameters similar to distilled water.

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