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首页> 外文会议>Conference on Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications; 20080119-21; San Jose,CA(US) >Thin Hollow Glass Waveguide for Near IR Radiation Delivery
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Thin Hollow Glass Waveguide for Near IR Radiation Delivery

机译：薄空心玻璃波导，用于近红外辐射传输

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The delivery of the radiation by thin fiber is required for some application, especially in medical internals treatment. Therefore a new 100 μm and 250 μm inner diameter hollow glass waveguides were developed and investigated for the possibility to transport high power near infrared laser radiation without damage of these delivery systems. As laser sources two Nd:YAG laser systems working in Q-switched regime at wavelength 1.06 μm and 1.34 μm were utilized. Delivered radiation characterization was performed. By Alexandrite laser (755 nm) pumped Q-switched Nd:YAG laser has been generating 1.06 μm wavelength radiation with 6 ns length of pulse and maximum output energy 0.7 mJ (116.7 kW). The laser was Q-switched using LiF:F~(2-) saturable absorber. Second laser system was Nd:YAG/V:YAG microchip pumped by laser diode operating at 808 nm. The radiation at 1.3 μm wavelength has been generated with 250 Hz repetition rate. Pulse length was 6 ns and mean output power 25 mW. Corresponding pulse energy and peak power was 0.1 mJ and 16.7 kW, respectively. Both lasers were operating in fundamental TEMoo mode (M~2 ～ 1). For delivery a special cyclic olefin polymer-coated silver hollow glass waveguides with the inner/outer diameters 100/190 um and 250/360 urn were used. The delivery system was consisted of lens, protector, and waveguide. As results the transmission more than 55 % and reasonable spatial profile of laser output radiation were found. From these measurements it can be recommended using of this system for near infrared powerful radiation delivery as well as for medical treatment.
机译：对于某些应用，特别是在医疗内部处理中，需要通过细纤维传输辐射。因此，开发了一种新的内径为100μm和250μm的中空玻璃波导，并研究了在不损坏这些传输系统的情况下传输高功率近红外激光辐射的可能性。作为激光源，使用了两个在波长为1.06μm和1.34μm的Q开关状态下工作的Nd：YAG激光系统。进行了辐射表征。泵浦的Q开关Nd：YAG激光器通过Alexandrite激光器（755 nm）产生了1.06μm波长的辐射，脉冲长度为6 ns，最大输出能量为0.7 mJ（116.7 kW）。使用LiF：F〜（2-）饱和吸收剂对激光器进行Q开关。第二激光系统是由工作在808 nm的激光二极管泵浦的Nd：YAG / V：YAG微芯片。以250 Hz的重复频率产生了1.3μm波长的辐射。脉冲长度为6 ns，平均输出功率为25 mW。相应的脉冲能量和峰值功率分别为0.1 mJ和16.7 kW。两种激光器都在基本TEMoo模式下工作（M〜2〜1）。为了进行传送，使用了内/外径为100/190 um和250/360 um的特殊环状烯烃聚合物涂覆的银空心玻璃波导。传输系统由透镜，保护器和波导组成。结果，发现透射率超过55％，并且激光输出辐射的空间分布合理。从这些测量结果中，建议将该系统用于近红外强大的辐射传输以及医学治疗。

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