Highly Intelligent Delivery System in Biomedical Optics

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There has been increasing interest in minimal invasive medicine that is a new type of treatment and diagnosis technique making no large damage or pain to human body. Biomedical optics is a main research area of the minimal invasive medicine and various lasers have been developed for medical applications. For high performance of the medical laser system, an efficient beam delivery equipment is necessary.A purpose of this project is to develop a highly efficient, laser delivery system equipped with a hollow waveguide as a flexible delivery medium. Main results achieved this term are as follows :1) Held international conferences on biomedical opticsBiOS Europe '96 : September '96 (Vienna, Austria)BiOS '97 : February '97 (San Jose, USA)GCL/HPL '96 : August '96 (Edinburgh, UK)2) Development of extremely-low-loss hollow fiber and efficient fabrication process Hollow waveguides with multiple dielectric layrs were fabricated to obtain an extremely low-loss hollow fibers. Basic experiments to c … More hoose an appropriate dielectric material was performed and the result showed that polymers, such as polyimide and fluorocarbon, and inorganic materials, for example, zinc sulfide, germanium, silver iodide, were chosen as suitable materials for low-loss hollow fibers.As for development of highly efficient fabrication process, we developed an all liquid-phase deposition method. In this method, coating of dielectric as well as metal layr is performed by using a liquid-flow-and-dry method. For this method, we also found that polymer films are appropriate dielectric material.3) Development of optical attachment for hollow waveguidesOptical attachments for a high-performance, laser delivery system were developed. For input end of hollow waveguides, we proposed a lensed-taper launching coupler for high efficient coupling between incident laser beam and hollow waveguides. This coupler also prevent a guide's end from a damage due to miscoupling. For output end, we developed a fixed-bent, hollow fiber piece and a beam homogenizer for easy handling of total delivery system. Less