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This study describes the use of diffractive optical elements (DOEs), namely phrase gratings, for the simplification of typical illumination schemes employed in digital speckle pattern interferometry. The diffraction gratings are recorded in a photoploymer material that delivers very high diffraction efficiency in transmission but which requires relatively low exposure energies. A significant advantage of this material is that it is completely self-developing, allowing the recording of a custom DOE in-situ and the monitoring of grating efficiency during processing. An example of utilizing this type of DOE in a novel out-of-plane speckle interferometer with what is effectively two-beam illumination is described.

Additional information

Authors: ISIS, ;JRC-ISPRA (IT),
Bibliographic Reference: Paper presented: Interferometry 99, Warsaw (PO), 20-23rd September (1999)
Availability: Available free of charge from Public Relations and Publications Unit, Ispra (IT)
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