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Practical Studies of Flexible Laser Guiding Systems for Ultra-Violet Laser Transmission

紫外激光传输柔性激光制导系统的实践研究

基本信息

批准号：
07555341
负责人：
NAKAYAMA Takeyoshi
金额：
$ 1.09万
依托单位：
KINKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555341/
关键词：
Ultraviolet Laser Excimer Laser Ultraviolet Fiber OH Ion Oxygeon Defect Center E'Color Center Dopant E'センター水酸化イオン E′センター ArFレーザー KrFレーザー骨切開光化学効果

项目摘要

The interactions between ultraviolet laser and living biotissue were studied. Clean and effective cutting of living soft biotissurs (e.g.muscle, lipid) and hard biotissues (e.g.bone, tooth) has been found without any sign of thermal damage in ArF (wavelength : 193nm) and KrF ( : 248nm) excimer laser irradiation. These excimer lasers will be available to use in the medical fields ; orthopedics, dentistry, opthalmology and cardiovascular surgery. The conventional quartz glass fiber can not transmitted ultraviolet laser under 300nm of wavelength. We have studied the ultra-pure quartz fiber with OH ion doped core for ArF and KrF laser transmission. In this fiber with several hundreds ppm of OH ion, the high transmittance indicated at the initial stage. Therefore, the transmittance was decaying with the repetive pulse transmission. This behavior was caused by E'color center of defect. The transmittance decline was controlled by dopant of the core and clad, by the graded index distribution in clad. E'color center was not a stable defect. This defect was eliminated if the fiber was heated. On the other hand, the fiber with several ppm of OH ion could not be used at the several pulse laser operation. But the transmittance of this fiber increased to 80%/m with the repetive pulse transmission. This increase of the transmittance was caused by the oxygen defect center. This defect was generated in the manufacture process of the fiber, was dissociated by laser transmission. The laser damage threshold of the incident end of the fiber was around 1 J/cm^<2.> pulse. It was so difficult to enhance the delivery energy. The special fiber with conical incident part will be useful for high energy transmission. From the above results, the ultraviolet fiber has many problems. There is every prospect of our solution.

研究了紫外激光与生物组织的相互作用。ArF（波长：193 nm）和KrF（波长：248 nm）准分子激光对活体软组织（如肌肉、脂质）和硬组织（如骨、牙齿）的切割干净有效，无任何热损伤迹象。这些准分子激光器将可用于医疗领域;整形外科、牙科、眼科和心血管外科。传统的石英玻璃光纤不能传输300 nm以下的紫外激光。研究了用于ArF和KrF激光传输的纤芯掺OH离子的高纯石英光纤。在这种光纤中，当OH离子含量达到几百ppm时，在初始阶段就显示出高的透过率。因此，透射率随着重复脉冲传输而衰减。这种现象是由缺陷的E '色心引起的。透过率的下降受纤芯和包层的掺杂以及包层中折射率梯度分布的控制。E '色心不是一个稳定的缺陷。如果纤维被加热，则该缺陷被消除。另一方面，具有几ppm OH离子的光纤不能用于多脉冲激光操作。但在重复脉冲传输时，光纤的透过率可达80%/m。这种透射率的增加是由氧缺陷中心引起的。这种缺陷是在光纤制造过程中产生的，通过激光的传输而被解离。光纤入射端的激光损伤阈值约为1 J/cm 2<2.>脉冲。想要提升传送能量，实在是太难了。这种具有锥形入射部分的特殊光纤将有助于高能量传输。从以上结果来看，紫外线光纤存在很多问题。我们的解决方案完全有前景。