Output device with high performance for Er:YAG laser light delivery

用于 Er:YAG 激光传输的高性能输出设备

• 批准号: 15500309
• 负责人: SHI Yi-wei
• 金额: $ 2.37万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15500309/
• 关键词: output device; hollow optical fiber; multiwavelength; multifunctional; underwater delivery; laser; infrared; calculus; 空中ファイブ; 赤外レーザ; パイロット光; シーリングキャプ; 出射先端装置; 結石破砕

(1)Hollow optical fiber has found wide applications in industrial and medical fields. A cyclic olefin polymer-coated silver (COP/Ag) hollow optical fiber is one of the most competent candidates for medical applications because of the properties of low transmission loss, non-toxicity, little aging effect and low cost. For infrared laser light delivery in hollow fiber, a pilot beam is often required to avoid laser hazard. We have improved the fabrication techniques to reduce the surface roughness of silver and polymer layers. Low loss has been obtained for the hollow fiber in visible and near-infrared regions as well as in middle infrared region. Pilot beam and multiwavelength infrared laser beams were delivered with low loss simultaneously.(2)An Er:YAG laser light delivery system composed of a polymer-coated silver hollow waveguide and a quartz sealing cap has been developed for calculus fragmentation. Sealing caps with various distal-end geometries were fabricated, and the focusing eff … More ects of these caps for Er:YAG laser light were measured both in air and in water. Owing to the high power capability of the quartz sealing caps, a beam of Er:YAG laser light with an output energy of 200 mJ and a repetition rate of 10 Hz was successfully transmitted in saline solution by using the system. Calculus fragmentation experiments conducted in vitro showed that the delivery system is suitable for medical applications in lithotripsy. We also found that the cap with a focusing effect is more effective in cutting calculi. The deterioration of the sealing caps after the calculus fragmentation is also discussed.We have experimentally quantified calculus fragmentation by Er:YAG laser light. Er:YAG laser light was delivered to an underwater target through a sealed hollow optical fiber. Fragmentation efficiency was obtained for an alumina ball used as a calculus model when sealing caps with various focusing effects were used. Three types of human calculi were analyzed and their absorption properties at the wavelength of Er:YAG laser light were obtained. The relationships among the absorption properties, calculus constituents, and fragmentation efficiency are discussed.(3)A sealing cap had been proposed as an output device for hollow optical fibers in delivering laser light underwater. Properties of sealing cap were experimentally discussed when used in ablation on soft tissue for Er:YAG laser. A self-cleaning effect of the sealing cap was observed when various targets were used for different laser light power. Debris from pork fat formed a uniform oil layer on the output surface of the cap, and the oil layer is relatively transparent in Er:YAG laser light wavelength band. When the target was pork muscle, almost no debris could attach on the surface of the cap. The self-cleaning effect was more obvious when ablation was conducted underwater because of the protection of the water film between the target and the cap's surface. Less

(1)中空光纤在工业和医疗领域有着广泛的应用。环烯烃聚合物涂覆银（COP/Ag）中空光纤具有传输损耗低、无毒、老化效应小和成本低的特点，是最适合医疗应用的候选光纤之一。对于中空光纤中的红外激光传输，通常需要引导光束以避免激光危害。我们改进了制造技术，以降低银和聚合物层的表面粗糙度。中空光纤在可见光、近红外区域以及中红外区域均实现了低损耗。引导光束和多波长红外激光束同时以低损耗传输。(2)开发了一种由聚合物涂层银空心波导和石英密封帽组成的Er:YAG激光传输系统，用于碎石。制造了具有各种远端几何形状的密封帽，并在空气和水中测量了这些密封帽对 Er:YAG 激光的聚焦效果。由于石英密封盖的高功率能力，使用该系统成功地在盐溶液中传输了输出能量为200 mJ、重复频率为10 Hz的Er:YAG激光束。体外进行的结石碎裂实验表明，该输送系统适用于碎石术的医疗应用。我们还发现，具有聚焦效果的帽子对于切割结石更有效。还讨论了牙石碎裂后密封盖的劣化。我们通过 Er:YAG 激光对牙石碎裂进行了实验量化。 Er:YAG 激光通过密封的中空光纤传输到水下目标。当使用具有不同聚焦效果的密封盖时，获得了用作微积分模型的氧化铝球的破碎效率。对三种类型的人体结石进行了分析，并获得了它们在 Er:YAG 激光波长下的吸收特性。讨论了吸收性能、微积分成分和破碎效率之间的关系。(3)提出了一种密封帽作为空心光纤水下传输激光的输出装置。实验讨论了Er:YAG激光软组织消融密封帽的性能。当不同的目标用于不同的激光功率时，观察到密封盖的自清洁效果。猪肉脂肪碎片在盖子的输出表面上形成了均匀的油层，并且该油层在Er:YAG激光波长带内相对透明。当目标是猪肉肌肉时，盖子表面几乎不会附着任何碎屑。在水下进行烧蚀时，由于目标与帽表面之间有水膜的保护，自清洁效果更加明显。较少的

项目成果

Penetration of high-intensity Er:YAG laser light emitted by IR hollow optical fibers wth sealing caps in water

带有密封盖的红外中空光纤发出的高强度 Er:YAG 激光在水中的穿透性

• 发表时间: 2004
• 期刊: Applied Optics 42・12
• 作者: T.J.Stephens;K.Iwai;Y.W.Shi;T.J.Stephens;K.Iwai;Y.W.Shi;Y.W.Shi;K.Iwai;K.Iwai;T.Dostalova;T.Dostalova;H.Jelinkova;H.Jelinkova;H.Jelinkova;K.Iwai;T.Dostalova;H.Jelinkova;H.Jelinkova;H.Jelinkova;K.Iwai
• 通讯作者: K.Iwai

Andreas Kuhn: "Compact effector optics for processing in limited physical access situations"Appl.Opt.. 42・25. 5101-5105 (2003)

Andreas Kuhn：“用于在有限物理访问情况下进行处理的紧凑型效应器光学器件”Appl.Opt.. 5101-5105 (2003)。

Song Ouyang: "Rugged distal tips for CO_2 laser medicine"Opt.& Laser Technol.. 35・2. 65-68 (2003)

欧阳宋：“CO_2激光医学的坚固远端尖端”Opt.& Laser Technol.. 35・2 (2003)。

Katsumasa Iwai: "Penetration of high-intensity Er : YAG laser light emitted by IR hollow optical fibers with sealing caps in water"Appl.Opt.. 43・12(in press). (2004)

Katsumasa Iwai：“高强度 Er 的穿透：带密封盖的 IR 中空光纤在水中发射的 YAG 激光”Appl.Opt.. 43・12（印刷中）。

Comparison of mid infrared lasers effect on ureter tissue

• DOI: 10.1002/lapl.200310038
• 发表时间: 2004-03
• 期刊: Laser Physics Letters
• 影响因子: 1.7
• 作者: H. Jelínková;O. Kőhler;M. Němec;P. Koranda;J. Šulc;V. Kubecek;P. Drlík;M. Miyagi;Yi-Wei Shi;Y. Matsuura;M. Kokta;P. Hrabal;M. Jelinek