INTEGRATED FIBER OPTIC PROBE FOR DYNAMIC LIGHT-SCATTERING

An integrated fiber optic probe, comprising a monomode optical fiber f usion spliced to a short length of a graded-index multimode fiber, is fabricated for use as a coherent receiver in dynamic light scattering. The multimode fiber is cleaved to provide a gradient-index fiber lens with a focal length of 125 mum and an f-number close to unity. An int egrated fiber receiver is used to measure the intensity-intensity auto correlation data from a 0.05% by weight concentration of an aqueous su spension of polystyrene latex spheres. Analysis of 100 independent dat a sets indicates that the particle size can be recovered with an accur acy of +/- 1%.