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1.3 PHYSICAL SCIENCES, Optics, Polymer science
A new application of a photopolymer diffractive optical element in electronic speckle pattern shearing interferometer (ESPSI) is presented. In the first stage a holographic grating is recorded using an acrylamide based photopolymer material. Since the polymerisation process occurs during recording, the holograms are produced without any development or processing. In the second stage the holographic grating is used to produce the two sheared images in an ESPSI configuration. A ground glass screen following the grating serves the purpose of eliminating unwanted diffraction orders. The distance between the grating and the ground glass can be used to control the amount of the shear. The sheared images on the ground glass are further imaged onto a CCD camera. The proposed system is simple and flexible.
Mihaylova, E., Naydenova, I., Martin, S., Toal, V.: Application of a photopolymer material in speckle pattern shearing interferometry. Proceedings of 9th International Conference on Photorefractive Effects, Materials and Devices, La Colle sur Loup, France, June 17-21, PD7, 2003.