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

本研究的目的是建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.高压亚音速氧碘化学激光器研制成功。与以前的COIL相比，激光腔的工作压力增加了数倍。因此，对真空泵容量的要求降低到五分之一。这导致COIL器件的尺寸大大减小。获得了25%的化学效率，与以往的超声操作相当.研制了1 kW级移动的COIL样机。在超声速工况下获得了1343 W的输出功率，在高压亚声速工况下，在6 Torr的工作压力下获得了1123 W的输出功率。可以进一步增加操作压力，并且最终，在12托下操作是成功的。获得的比能量为3.8J/L。已证明可连续运行一小时。新开发的盐阱有效地发挥了作用.研究了COIL对混凝土、岩石等潜在材料的切削性能。30 kW级设备的预测切割能力为350 mm/min（沥青-100mm厚）、260 mm/min（混凝土-100mm厚）等.进行了大功率光纤传输的基础实验。发现目前可用的光纤在弯曲损耗和传输损耗方面是可行的。另一方面，连接损耗为6%，太大而不实用。通过以上研究，我们在COIL作为上述应用的工具方面取得了重大进展，并为实现这一目标建立了里程碑。

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.