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Stubenvoll M, Schäfer B, Mann K, et al. Photothermal method for absorption measurements in anisotropic crystals. Rev Sci Instrum. 2016;87(2):023904doi: 10.1063/1.4941662.
Stubenvoll, M., Schäfer, B., Mann, K., & Novak, O. (2016). Photothermal method for absorption measurements in anisotropic crystals. The Review of scientific instruments, 87(2), 023904. https://doi.org/10.1063/1.4941662
Stubenvoll, M, et al. "Photothermal method for absorption measurements in anisotropic crystals." The Review of scientific instruments vol. 87,2 (2016): 023904. doi: https://doi.org/10.1063/1.4941662
Stubenvoll M, Schäfer B, Mann K, Novak O. Photothermal method for absorption measurements in anisotropic crystals. Rev Sci Instrum. 2016 Feb;87(2):023904. doi: 10.1063/1.4941662. PMID: 26931863.
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Rev Sci Instrum. 2016 Feb;87(2):023904. doi: 10.1063/1.4941662.

Photothermal method for absorption measurements in anisotropic crystals.

The Review of scientific instruments

M Stubenvoll, B Schäfer, K Mann, O Novak

Affiliations

  1. Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany.
  2. HiLASE Centre, Institute of Physics, Academy of Sciences of the Czech Republic, Za Radnicí 828, 252 41 Dolní B?ežany, Czech Republic.

PMID: 26931863 DOI: 10.1063/1.4941662

Abstract

A measurement system for quantitative determination of both surface and bulk contributions to the photo-thermal absorption has been extended to anisotropic optical media. It bases upon a highly sensitive Hartmann-Shack wavefront sensor, accomplishing precise on-line monitoring of wavefront deformations of a collimated test beam transmitted perpendicularly through the laser-irradiated side of a cuboid sample. Caused by the temperature dependence of the refractive index as well as thermal expansion, the initially plane wavefront of the test beam is distorted. Sign and magnitude depend on index change and expansion. By comparison with thermal theory, a calibration of the measurement is possible, yielding a quantitative absolute measure of bulk and surface absorption losses from the transient wavefront distortion. Results for KTP and BBO single crystals are presented.

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