Evaluation and Highly Technological Uses of Infrared Guides

为了评估和开发用于电力传输和传感器应用的红外空心波导，罗格斯大学的哈林顿教授和东北大学的宫城先生的研究小组进行了联合研究。研究结果如下：1。我们采用耐用无毒的ZnS作为涂层内介质，制备了损耗极小的ZnS包覆银波导。设计了能传输CO和Er: YAG激光的波导。发现内表面粗糙度是实现极小损耗和良好光束质量的重要因素。因此，我们采用玻璃管作为芯棒。为了传输KW级的二氧化碳激光，设计了一种介质涂层金属波导的冷却系统，首次实现了3kw的激光通过4m长的波导传输。蓝宝石空心波导的研究蓝宝石空心波导是一种全内反射型波导，采用EFG法制备了小芯径的蓝宝石空心波导。结果表明，内表面粗糙度对损失的影响比理论预期的要大得多。中空波导的应用介质涂层金属和蓝宝石中空波导已先后应用于红外辐射测量和气体探测。1992年9月5日至6日，在SPIE的支持下，A. Katzir教授、J. A. Harrington教授和我在波士顿举行了国际研讨会。

In order to evaluate and to develop infrared hollow waveguides for power delivery as well as sensor applications, the joint research has been made between the research groups of Professor Harrington of Rutgers University and M. Miyagi of Tohoku University. The results made are as follows :1. Loss reduction of dielectric-coated metallic waveguides As a coating inner dielectric, we have employed ZnS which id durable and nontoxic and fabricated ZnS-coated Ag waveguides with very small losses. The waveguides have been also designed so as to transmit CO and Er : YAG laser light. The roughness of inner surface is found to be a very important factor to realize extremely small losses and good beam quality. Therefore, we have employed a glass tube as a mandrel.2. Mounting technique of dielectric-coated metallic waveguides In order to transmit KW-order carbon dioxide laser light, a cooling system for the waveguides are designed and 3 KW laser light was transmitted through a 4m long waveguide for the first time.3. Study on sapphire hollow waveguide As a total internal reflection-type waveguide, sapphire hollow waveguides with small core diameter have been fabricated by the EFG method. It id found that the inner surface roughness causes significantly loss increase than theoretically expected.4. Application of hollow waveguides The dielectric-coated metallic and sapphire hollow waveguides have been successively applied to infrared radiometry and gas detection.5. Holding of international symposium The international symposium was held by Professors A. Katzir, J. A. Harrington, and myself in Boston, from September 5 to 6 in 1992 supported by SPIE.