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Abstract
A new laser holographic technique has been developed to visualize sub-micron particles. If the size of the particle is comparable with or less than wavelength, it is very difficult to obtain the image of small particles by the conventional optical method.We have obtained the holographic interference fringes by means of superposition of the reference light and the scattered light of comparable intensity by a particle irradiated at the beam waist of focused coherent light. The two-dimensional particle location is measured in terms of the center of holographic fringes, and the three dimensional depth of particle position from the recording plane is obtained by the reconstruction of the hologram.
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