Efficient and mechanical stable laser machined optical fiber diffuser for clinical applications

Ströbl, Stephan; Wäger, Felix; Domke, Matthias; Sroka, Ronald

doi:10.1364/translational.2020.tw2b.4

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“…The underlying cuboids as described above had a fixed height h cuboid = 20 µm (as described above) and a fixed length l cuboid = 500 µm along the z ‐direction (i.e., along the fiber axis) with unprocessed spacer regions of fixed length l space = 250 µm in between, resulting in a diffuser region of total length 40.25 mm. Including spacer regions in the laser‐inscribed pattern had previously been found to be beneficial in terms of emission efficiency [44]. To obtain a satisfactorily homogeneous emission profile along the fiber axis, the widths w cuboid, n of the cuboids in the x ‐direction (and thus the number of continuous laser‐modified sheets parallel to the yz ‐plane making up one laser‐modified region, as described above) were not constant, but increased with increasing cuboid order number n = 1 … 54 toward the distal fiber tip, from w min = 20 µm to w \ max = 200 µm.…”

Section: Methodsmentioning

confidence: 99%

Homogeneously Emitting, Mechanically Stable, and Efficient fs‐Laser‐Machined Fiber Diffusers for Medical Applications

et al. 2020

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Background and Objectives: Light delivery is an essential part of therapy forms like photodynamic therapy (PDT), laser-induced thermotherapy, and endovenous laser therapy. While there are approaches to the light application for all three therapies, there is no diffuser that can be used for all three approaches. This diffuser must meet the following criteria: Homogeneous radiation profile over a length of 40 mm, efficient light extraction in the diffuser area, mechanical breakage resistance as well as thermal stability when applying high power. Study Design/Materials and Methods: An ultrashort pulse laser was used to inscribe inhomogeneities into the core of a fused-silica fiber core while scanning the laser focus within a linear arrangement of cuboids centered around the fiber axis. The manufactured diffuser was optically and mechanically characterized and examined to determine the maximum power that can be applied in a tissue environment. Results: Based on the analysis of all examined diffusers, the manufactured diffuser exhibits an emission efficiency ε = (81.5 ± 5.9)%, an intensity variability of (19 ± 5)% between distal and proximal diffuser end, and a minimum bending radius R b = (15.4 ± 1.5) mm. It was taken advantage of the fact that the outer areas of the fiber core do not undergo any structural changes due to the machining and therefore do not suffer a major loss of stability. Tissue experiments revealed that a maximal power of 15 W was deliverable from the diffuser without harming the diffuser itself. Conclusions: It could be shown that a diffuser manufactured by ultrafast-laser processing can be used for low power applications as well as for high power applications. Further tests have to show whether the mechanical stability is still maintained after the application of high power in a tissue environment. Lasers Surg. Med.

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Section: Methodsmentioning

confidence: 99%

Homogeneously Emitting, Mechanically Stable, and Efficient fs‐Laser‐Machined Fiber Diffusers for Medical Applications

et al. 2020

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Efficient and mechanical stable laser machined optical fiber diffuser for clinical applications

Abstract: By internally structuring optical fibers, using an ultrafast laser, diffusers for selective illumination of tissue regions can be obtained, while maintaining decoupling efficiencies of up to 83% and mechanical stabilities comparable to non-machined optical fibers.

Cited by 1 publication

References 1 publication

Homogeneously Emitting, Mechanically Stable, and Efficient fs‐Laser‐Machined Fiber Diffusers for Medical Applications

Homogeneously Emitting, Mechanically Stable, and Efficient fs‐Laser‐Machined Fiber Diffusers for Medical Applications

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