Photothermal - wave diffraction and interference in condensed media : experimental evidence in aluminum
نویسندگان
چکیده
Thermal-wave fields have been optically generated and measured, using spatially resolved scanning photopyroelectric detection. Both single laser-beam diffraction profiles and thermal-wave patterns from two laser beams, interfering coherently in a manner analogous to Young's optical-wave experiment, have been produced. The diffraction and interference images have further been shown to be in excellent qualitative agreement with a Laplace thermal-wave propagation formalism, which treats thermal-wave diffraction in the small-aperture approximation. A mechanism for quantitative agreement was obtained after the finite size of the probing metal detector tip was taken into account in mapping thermal-wave fields.
منابع مشابه
Theory of photothermal-wave diffraction and interference in condensed media
Received February 11, 1988; accepted August 29, 1988 Thermal-wave field diffraction has been treated as the extreme near-field approximation of a three-dimensional superposition integral that includes the generating optical aperture function. This formalism is quite general and is convenient for applications with many experimental diffracting apertures. Specific examples of useful photothermal ...
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