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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