Highly Intelligent Delivery System in Biomedical Optics

微创医学是一种对人体无大的损伤和痛苦的新型治疗和诊断技术，近年来受到越来越多的关注。生物医学光学是微创医学的主要研究领域，各种激光器已被开发用于医疗应用。为了实现高性能的医用激光系统，需要一种高效的光束传输设备，本课题的目的之一是开发一种以中空波导为柔性传输介质的高效激光传输系统。本学期取得的主要成果如下：1）举办了生物医学光学国际会议BiOS Europe '96：96年9月（奥地利维也纳）BiOS '97：97年2月（圣何塞，美国）GCL/HPL '96：'96年8月（爱丁堡，英国）2）极低损耗中空光纤的开发和有效的制造工艺制造具有多个介质层的中空波导以获得极低损耗中空光纤。基础实验C ...更多信息 选择了合适的介质材料，结果表明，聚酰亚胺、氟碳化合物等高分子材料和硫化锌、锗、碘化银等无机材料是制备低损耗中空光纤的理想材料。在该方法中，通过使用液体流动和干燥方法来执行电介质以及金属层的涂覆。对于这种方法，我们还发现聚合物薄膜是合适的介电材料。3）中空波导光学附件的开发了用于高性能激光传输系统的光学附件。对于空芯波导的输入端，我们提出了一种锥形透镜耦合器，用于入射激光束与空芯波导的高效耦合。该耦合器还防止了由于误耦合而导致的引导件端部的损坏。在输出端，我们开发了一个固定弯曲，中空纤维片和光束均匀器，以便于总传输系统的处理。少

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