Thorlabs offers lapping (polishing) sheets to polish a connector after the fiber has been epoxied into the ceramic ferrule. Polishing or Lapping Film is composed of tiny particles glued to a substrate. By moving the connector over the polishing film, excess material is removed and the fiber end is polished. Different grades of polishing film are used in successive polishing cycles. Each polishing cycle uses a finer grit paper.
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Our diamond sheets have tiny diamond particles glued to a substrate of polyester with resin. We highly recommend a five step polishing process: the first four steps using diamond sheets in four different grit sizes of 30 µm, 6 µm, 3 µm, and 1 µm, and the fifth using our final polishing sheets which have a grit size of 0.01 µm. To use, drop distilled water onto the sheet and polish in a figure-eight motion using an appropriate polishing puck (sold below).
Our Final Polishing Sheets (Item # LFCF2), which eliminate the need for slurry, are designed to be used as the last step in the fiber polishing process. These sheets are made by coating polyester film with precision-grade silicon dioxide. These sheets produce an excellent surface finish with minimal scratches and offer no binder contamination on the optical fiber during polishing.
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We recommend using these sheets over the less expensive aluminum oxide, silicon carbide, or calcined alumina sheets when polishing ceramic or zirconia ferrules because they do not cause undercutting when polishing the connector like silicon carbide can. Undercutting occurs when the fiber material is removed more quickly than the ferrule material creating a dip just above the fiber. When the connector is mated to another connector, instead of obtaining a glass-to-glass interface, the air gap created by the undercutting causes a glass-air-glass interface and excess loss, which is undesirable.
Despite the higher upfront cost per sheet, each area of the sheet can be used up to 20 times instead of once, compared to the aluminum oxide, silicon carbide, and calcined alumina sheets featured below. This greatly increases its value. These 6&#; x 6&#; sheets should be used with our glass polishing plates and rubber mats (see below).
Note: The diamond and final polishing films are sold in packages of 5.
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