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首页> 外文会议>Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI; Progress in Biomedical Optics and Imaging; vol.7 no.6 >Delivery of Erbium: YAG Laser Radiation Through Side-Firing Germanium Oxide Fibers
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Delivery of Erbium: YAG Laser Radiation Through Side-Firing Germanium Oxide Fibers

机译：Side气发射：YAG激光通过侧燃氧化锗纤维辐射

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摘要

The Erbium:YAG laser is currently being tested experimentally for endoscopic applications in urology, including more efficient laser lithotripsy and more precise incision of urethral strictures than the Holmium:YAG laser. While side-firing silica fibers are available for use with the Ho:YAG laser in urology, no such fibers exist for use with the Er:YAG laser. These applications may benefit from the availability of a side-firing, mid-infrared optical fiber capable of delivering the laser radiation at a 90-degree angle to the tissue. The objective of this study is to describe the simple construction and characterization of a side-firing germanium oxide fiber for potential use in endoscopic laser surgery. Side-firing fibers were constructed from 450-μm-core germanium oxide fibers of 1.45-m-length by polishing the distal tip at a 45-degree angle and placing a 1-cm-long protective quartz cap over the fiber tip. Er:YAG laser radiation with a wavelength of 2.94 μm, pulse duration of 300 μs, pulse repetition rate of 3 Hz, and pulse energies of from 5 to 550 mJ was coupled into the fibers. The fiber transmission rate and damage threshold measured 48 ± 4 % and 149 ± 37 mJ, respectively (n = 6 fibers). By comparison, fiber transmission through normal germanium oxide trunk fibers measured 66 ± 3%, with no observed damage (n = 5 fibers). Sufficient pulse energies were transmitted through the side-firing fibers for contact tissue ablation. Although these initial tests are promising, further studies will need to be conducted, focusing on assembly of more flexible, smaller diameter fibers, fiber bending transmission tests, long-term fiber reliability tests, and improvement of the fiber output spatial beam profile.
机译：目前正在对泌尿科的内窥镜应用进行实验性的Erbium：YAG激光试验，包括比Holmium：YAG激光更有效的激光碎石术和更精确的尿道狭窄切口。虽然泌尿外科手术中可以使用侧面烧制的二氧化硅纤维与Ho：YAG激光器一起使用，但不存在与Er：YAG激光器一起使用的此类纤维。这些应用可得益于能够将90度角的激光辐射传递到组织的侧向发射的中红外光纤。这项研究的目的是描述潜在用于内窥镜激光手术的侧烧氧化锗纤维的简单构造和特性。通过以45度角抛光远端尖端并在光纤尖端上放置一个1厘米长的保护性石英帽，由长度为1.45米的450-μm芯氧化锗纤维构成侧面发射纤维。波长为2.94μm，脉冲持续时间为300μs，脉冲重复频率为3 Hz，脉冲能量为5至550 mJ的Er：YAG激光辐射耦合到光纤中。光纤传输率和损坏阈值分别为48±4％和149±37 mJ（n = 6根光纤）。相比之下，通过普通氧化锗主干纤维的纤维传输率为66±3％，没有观察到损坏（n = 5根纤维）。足够的脉冲能量通过侧向发射纤维传输，用于接触组织消融。尽管这些初始测试是有希望的，但仍需要进行进一步的研究，重点是更柔软，直径较小的光纤的组装，光纤弯曲传递测试，长期光纤可靠性测试以及光纤输出空间光束轮廓的改善。

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