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|Type:||Artigo de periódico|
|Title:||Adaptive Holographic Interferometry Using Photorefractive Crystals|
|Abstract:||A modified technique of dynamic holographic interferometry is described which allows high-frequency vibrations of real objects with amplitudes as low as 1 Å to be measured. In the technique, a low-frequency phase modulation of a relatively large amplitude was imposed on one of the beams. The modulation was used to both actively stabilize the setup and enhance the measured high-frequency signal. Active stabilization of the setup ensures a high accuracy and reliability of measurements of low vibration amplitudes. Dynamic holograms were recorded in a photo-refractive Bi12TiO20 crystal at the HeNe laser wavelength (6328 Å). © 1989.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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