
05/05/2025
A 1.00 (+/- 0.01) millimeter diameter 'window' on a 0.273 mm core, Si/Si fiber is pictured.
It is unique, non-obvious and useful, i.e., it's patented. You may ask why that is. Others have welded windows on fibers for decades, after all.
Yet this structure has no weld and the window is clad with fluorine doped silica at 1.08 CCDR on the 1.1 CCDR fiber (Cladding to Core Diameter Ratio). Not only that, the input face is laser polished for an insanely high laser damage threshold and may be equipped with curvatures. (This one is a concave input surface for collimating converging laser foci, for example.)
The OD tolerance of the 'window' is +/- 1%. The distance between the original core and the input face may be maintained to +/- 0.025mm. Finally, the upper left inset shows that we can put these on both ends of a fiber, with the same lens or with different lenses.
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