Wet chemical etching technique for optical fibers
Johnson, Bertrand H
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Citation (published version)Greg Blonder, Bertrand H Johnson. "Wet chemical etching technique for optical fibers." U.S. Patent 5,200,024-A.
A wet chemical etching technique is disclosed for forming a lensed optical fiber. In particular, the fiber is placed in a mixture comprising buffered hydrofluoric acid (e.g., HF and NH4 F) and a treating agent comprising acetic acid or citric acid. The relative concentrations of the constituents are adjusted so that a double conical lens is formed which requires no further operations (such as fire polishing) to provide coupling efficiencies of about 80% with a standard deviation of less than ±2%.