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首页> 外文会议>Frontiers in ultrafast optics: biomedical, scientific, and industrial applications XVI >Fabrication of homogeneously emitting optical fiber diffusors using fs- laser ablation
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Fabrication of homogeneously emitting optical fiber diffusors using fs- laser ablation

机译：使用fs-激光烧蚀制造均匀发射的光纤扩散器

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The photodynamic therapy (PDT) enables selective treatment of cancerous tissue with light inside the human body. Optical fibers deliver the light into the cancerous tissue and diffusors that are attached to the ends of the fibers scatter the light inside the tumor. In order to destroy the entire cancerous tissue, the emission profile should be uniform along the fiber. Such fiber diffusors can be fabricated directly at the fiber end by ablating light-scattering cavities with fs-pulses around the tip using a combination of scanner and rotation axis. These cavities must be designed such that the light distribution is uniform along the diffusor. For a deeper understanding of the light propagation inside the fiber diffusor, the light transmission is measured during laser processing. The influence of the number of repetitions and of the number of ablated cavities is investigated. In addition, the transmission and the transmission change along the fiber is simulated as a function of the number, distance and size of defects using the Monte Carlo method. The results suggest that as soon as the cavities penetrate into the fiber core the total internal reflection is inhibited and light scatters at the roughened surface. Both simulation and experiment show that the number of emitted photons per cavity remains constant along the fiber until a photon is reflected a second time within the diffusor. Then the number of emitted photons decreases exponentially along the diffusor. In order to achieve a uniform emission profile, first the decoupling probability of the cavities should be constant until a photon is reflected a second time, then the decoupling probability should be increased approximately linear to compensate the attenuation along the diffusor.
机译：光动力疗法（PDT）能够利用人体内部的光线选择性治疗癌组织。光纤将光传递到癌组织中，附着在光纤末端的扩散器将光散射到肿瘤内部。为了破坏整个癌组织，发射轮廓应沿纤维均匀。通过使用扫描仪和旋转轴的组合，通过围绕尖端的fs脉冲烧蚀光散射腔，可以直接在光纤末端制造此类光纤扩散器。必须设计这些空腔，以使沿扩散器的光分布均匀。为了更深入地了解光纤扩散器内部的光传播，在激光处理过程中测量了光的透射率。研究了重复次数和烧蚀腔数的影响。另外，使用蒙特卡洛方法模拟了沿着纤维的传输率和传输率变化，它是缺陷数量，距离和大小的函数。结果表明，腔体一旦渗透到纤维芯中，就会抑制全内反射，并且光会在粗糙的表面散射。仿真和实验均表明，沿着光纤，每个腔的发射光子数量保持恒定，直到光子在扩散器中第二次反射为止。然后，发射的光子数量沿扩散器呈指数下降。为了获得均匀的发射轮廓，首先，腔的去耦概率应保持恒定，直到第二次反射光子为止，然后应将去耦概率增大为近似线性，以补偿沿扩散器的衰减。

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