THE DISASTER RELIEF AND THE ENVIRONMENTAL PROTECTION BY USING THE COIL (CHEMICAL OXYGEN-IODINE LASER)

本研究旨在确立化学氧碘激光器作为救灾和环境保护工具的技术里程碑。所得结果总结如下：1。高压亚音速操作COIL的开发是成功的。与以前的COIL相比，激光腔内的操作压力增加了几倍。因此，真空泵容量的要求降低到五分之一。这使得COIL设备的尺寸大大减小。获得了化学效率，25%与之前的超音速操作相当。研制了一种1kw级移动COIL装置样机。得到超声速工况下的输出功率为1343W。在高压亚音速工况下，在6 Torr的工作压力下获得1123W。手术压力可以进一步提高，最终在12torr下手术成功。所得比能为3.8J/l。已完成一小时连续运行试验。新开发的盐圈闭有效地发挥了作用。研究了COIL对混凝土、岩石等潜在材料的切割能力。预测30kw级设备切割能力分别为350mm/min（沥青-100mm厚）、260mm/min（混凝土-100mm厚）等。进行了大功率光纤传输的基础实验。结果表明，从弯曲损耗和传输损耗两方面来看，现有光纤是可行的。另一方面，连接损失为6%，这太大了，不实用。测试光纤的理论极限（受激布里渊散射）大于30kW。作为上述研究的结果，我们得出结论，我们已经在COIL作为上述应用的工具方面取得了重大进展，并为实现目标建立了里程碑。

This research has been done to establish the techological milestone of using COIL (chemical oxygen-iodine laser) as a tool for the disaster relief and environment protection. The obtained results are summarized as follows ;1. Development of a high-pressure subsonic operation of COIL was successful. The operating pressure at the laser cavity was increased several times compared to previous COIL's. As a result, the requirement of the vacuum pump capacity was reduced to a fifth. That results in a great size reduction for COIL devices. Obtained chemical efficiency, 25% was comparable to the previous supersonic operation.2. A 1kW-class prototype mobile COIL device was developed. Obtained output power in the supersonic operation regime was 1343W.In the high-pressure subsonic operation, 1123W was obtained at the operating pressure of 6 Torr. The operation pressure could be further increased and finally, operating at 12 Torr was successful. The obtained specific energy was 3.8J/liter. One-hour continuous operation has been demonstrated. The newly developed salt trap functioned effectively.3. Cutting capability of COIL to the potential materials, such as concrete and rock was studied. The predicted cutting capability of a 30kW-class device was 350mm/min (asphalt-100mm thick), 260mm/min (concretet-100mm thick), and so on.4. Basic experiments on the high-power optical fiber delivery were conducted. It was found that currently available fiber is viable in terms of bending loss and transmission loss. On the other hand, the connection loss was 6% and it was too large to be practical. The theoretical limit (Stimulated Brillouin Scattering) of the tested fiber was more than 30kW.As a result of above studies, we concluded that we have obtained a significant advance in the COIL as a tool of aforementioned applications, and established a milestone toward the goal.