Highly efficient and intelligent infrared delivery system

本课题的目的是实现高能量、高功率红外光的高效、智能传输系统。本项目的主要成果如下：1.促进生物医学光学的国际会议4在Bios Europe‘97、Bios’98、Bios Europe‘98和Bios’99光纤上与该项目的合作者举行了国际会议。生物光子学中红外递送系统的研究不断取得进展。聚合物红外光学常数的测量发展了一种在可见光、近红外和红外波段同时测量薄聚合物折射率和消光系数的方法。在此基础上，阐明了多种工程塑料的光学特性。聚合物镀膜空心光波导的损耗降低首先阐明了聚合物的溶剂、聚合物溶液的浓度和镀膜速度是降低光波导损耗的关键因素。成功地制作了内径为0.54-1.0 mm的2米长的光波导。透镜锥形耦合器的制作提出并制作了透镜锥形耦合器，以提高其对准公差，降低损耗。传输多路红外光的中空光波导的制作通过选择中空银管内涂覆聚合物层的厚度，以较小的损耗成功地传输了多路红外光以及红光或绿光。中空波导的密封有人提出了一种简单的技术来密封中空波导的末端。结果表明，在不破坏密封的前提下，存在一个最佳的密封膜厚度，从而使空芯波导的功率容量达到最大。

The purpose of this project is to realize highly efficient and intelligent delivery system for the infrared light with high energy or high power. Main results of this project are as follows :1. International conference to promote biomedical optics4 international meetings were held with collaborators in this project in BiOS Europe '97, BiOS '98, BiOS Europe '98 and BiOS '99 fibers. The continuous progress in the area of infrared delivery system in the biophotonics have been made.2. Measurements of optical constants of polymers in the infraredA method of simultaneous measurements of the refractive index and extinctioncoefficient of thin polymer has been developed in the visible, near-infrared, and infrared wavelength regions. Based on this method, optical characteristics of many engineering plastics have been clarified.3. Loss reduction of polymer-coated hollow waveguidesIt is firstly clarified that the solvent of polymer, concentration of polymer solution, and the coating speed are the key factors to reduce the waveguide losses. 2 m-long waveguides with inner diameters of 0.54-1.0 mm have been successfully fabricated.4. Fabrication of lensed taper couplerLnsed taper couplers have been proposed and fabricated to increase the alignment tolerance and loss reduction of them has been made.5. Fabrication of hollow waveguides transmitting multiple infrared lightBy choosing the thickness of polymer layer to be coated inside hollow silver tube, multiple infared light as well as aiming light of red or green color has beensuccessfully transmitted with small losses.6. Sealing of hollow waveguidesA simple technique has been proposed to seal the ends of hollow waveguides. It is clarified that there exits an optimum thickness of sealing film to maximize the power capability of hollow waveguides without any damage of the sealing.