HIGHLY INTELLOIGENT INPUT/OUTPUT DEVICES IN BIOMEDICAL OPTICS

输入/输出器件和空心波导是0.5 μm - 11 μm红外波段激光微创医学的关键技术。在本项目中，我们与国际合作开发高能量或高功率激光器的高智能输入/输出器件和可靠的空芯波导。主要研究结果如下：1.可见光红外中空纤维的研制通过精确控制银中空管内部沉积聚合物层的厚度，研制出既能有效传输可见光又能有效传输红外线的中空纤维. Er：YAG激光器的封接装置一种新研制的用于Er：YAG激光器中空光纤远端的玻璃封接帽。结构简单，密封帽的内径略大于中空纤维的外径。进行的初步实验显示了密封帽在眼科中的有用性。还制造了一种熔融石英帽，其传输效率比玻璃帽高得多。已经构建了一个完整的输送系统，包括输入耦合器、手柄和密封的中空纤维。对碎石术进行了进一步的实验研究。CO_2激光器的密封装置密封帽的材料不仅要对可见光透明，而且要对红外线透明。我们新开发了一种由NaCl晶体制成的密封帽。3 W连续CO_2激光已稳定传输.改变光方向的装置已经开发出在中空纤维的输出端改变光方向的简单装置。

Input/output devices and hollow waveguides are key elements of technology in minimally invasive laser medicine in infrared wavelengths of 0.5 μm - 11 μm. In this project, we develop the highly intelligent input/output devices and reliable hollow waveguides for high energy or high power laser under international collaboration. The results obtained are as follows:1. Development of infrared hollow fibers transmitting visible lightBy precise control of the thickness of deposited polymer layer inside a silver hollow tube, we develop hollow fibers which can transmit infrared as well as visible light efficiently.2. Sealing devices for Er:YAG laser lightA glass sealing cap is newly developed for the distal tip of hollow fiber for Er:YAG laser light. The structure is simple and the inner diameter of sealing cap is slightly larger than the outer diameter of hollow fiber. Preliminary experiments conducted show the usefulness of the sealing cap in ophthalmology. A fused silica cap is also fabricated whose transmission efficiency is much higher than the glass cap. A complete delivery system including input coupler, hand piece, and sealed hollow fiber has been constructed. Further experiments have been conducted on lithotripsy.3. Sealing devices for C02 laserA material of sealing cap should be transparent in infrared as well as visible light. We have newly developed a sealed cap made of NaCl crystal. 3W of CW C02 laser light has been stably transmitted.4. Devices changing light directionSimple devices have been developed which change the light direction at the output end of hollow fiber.