The French 4F consortium (10 partners, laboratories, technological centers, and laser companies) has developed new all-solid and low-cost fibers. The Ytterbium active fiber are produced for optimum laser performances, such as a Mode Field Diameter greater than 30 μm, Polarization Extinction Ratio greater than 15 dB, bending radius limited to a relatively small diameter (about 20cm). The fiber allows a laser operation exceeding 200 W. Microstructured, hollow core fibers are key to high power beam delivery. Beam delivery devices have been developed for high average power (up to 100W), high energy and with excellent beam quality.
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