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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 9,
  • Issue 12,
  • pp. 120001-
  • (2011)

High-precision method for measuring the photothermal properties of transparent media with digital holography (Invited Paper)

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Abstract

Quantitative phase microscopy by digital holography provides direct access to the phase profile of a transparent subject with high precision. This is useful for observing phenomena that modulate phase, but are otherwise difficult or impossible to detect. In this letter, a carefully constructed digital holographic apparatus is used to measure optically induced thermal lensing with an optical path difference precision of less than 1 nm. Furthermore, by taking advantage of the radial symmetry of a thermal lens, such data are processed to determine the absorption coefficient of transparent media with precisions as low as 1 × 10<sup>-5</sup> cm<sup>-1</sup> using low power (30 mW) continuous wave (CW) excitation.

© 2011 Chinese Optics Letters

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