Somerville Laser Technology (SLT) designs and manufactures efficient fiber coupled modules for optical fibers with core diameters of 225μm. No other company comes close.

The best values of efficiency as a function of ex-fiber power is illustrated below.  Low SWaP (size, weight, and waste power) models are sold only to US DoD organizations. In compliance with International Traffic in Arms Regulations (ITAR), SLT will only ship product within the US.

Product datasheets

High power, high brightness fiber lasers and amplifiers