A photosensitive material based on photo-induced polymerization has been used to record holograms. Exposure of 1 to 30 mJ/cm2 at 0.694 μ were followed by rapid optical, dry processing with ultraviolet radiation. Good resolution and diffraction efficiencies of up to 45% into the first order were observed.
An optical-spatial filtering technique for studying complex, high frequency, standing and traveling acoustic surface waves is described. The relative amplitude distribution is directly displayed, and the wavelength and velocity are accurately measured. The velocity for z propagation on a y-cut LiNbO3 crystal is found to be 3472.5 ± 1.5 m-sec−1.
The design, construction, and testing of a portable hologram microscope are described. The instrument is based on a small, reliable, pulsed ruby laser to avoid the degrading effects of vibration; the instrument weighs 7.9 kg and measures 30.5 cm x 33 cm x 15.5 cm. A magnifying relay lens is used in a design such that resolution is limited by the effects of speckle. These effects can be reduced by incoherent superposition of images from the four independent holograms of each object that are automatically recorded. Resolution is 3-4 microm, field of view is 4.5 mm, and depth of field is 4 mm. Results of measurements on resolution, image quality, image intensity fluctuations, and image signal-to-noise ratio are presented.
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