Coherent Ultra Matched+ (M+) passive series of Large Mode Area (LMA) double clad fibers are ideal for high power monolithic fiber lasers and amplifiers. These passive fibers are based on a 30 micron diameter core and 250 micron diameter clad size with a low NA (0.06) core. These M+ fibers represent the next generation of matched fibers. They are matched with ultra-high precision to their active Yb-doped 30/250 LMA M+ counterparts to ensure excellent splice compatibility and low loss. The M+ fibers are specified to the tightest specifications including the MFD, and use NuCOATFA coating technology ensuring excellent preservation of beam quality and extending operating life at the high power levels demanded by today’s industrial fiber laser applications.

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