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Improving a high-resolution fiber-optic interferometer through deposition of a reflective coating by simple dip-coating
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Image of FIG. 1.
FIG. 1.

Optical image of a perpendicularly cleaved fiber with 3% reflectivity. The top edge of the image shows the fractured region (caused by cleaver) in the cladding (diameter ).

Image of FIG. 2.
FIG. 2.

Optical image of a MOD coated fiber end. (a) Uniform coating resulting in (b) Nonuniform coating resulting .

Image of FIG. 3.
FIG. 3.

SEM micrograph of (a) uniformly coated fiber end with (b) A magnified image from the center of the fiber end in (a) shows the grains. Note that the dark patch in the center of a and b is due to the damage from repeated scanning at higher magnification.

Image of FIG. 4.
FIG. 4.

Raman spectrum of uncoated (black/bottom) and coated fibers (red/middle and blue/top). Red: nonuniformly coated fiber showing anatase phase; Blue: uniformly coated fiber showing rutile phase. The spectra are shifted along the -axis for clarity.

Image of FIG. 5.
FIG. 5.

Interferometric testing system. (a) Schematic and (b) actual.


Generic image for table
Table I.

List of liquids in which the fiber was immersed for 24 h to test for its robustness. The shown reflectivities did not change during the immersion time.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Improving a high-resolution fiber-optic interferometer through deposition of a TiO2 reflective coating by simple dip-coating