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Single mode fiber laser and their process applications

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Although fiber lasers have existed since the 1960s, [1] their performance evolved by leaps and bounds in the early 1990s with rapid progress of the erbium (Er) doped optical fiber amplifier (EDFA) for telecommunications. Higher power devices become possible in late 1990s using ytterbium (Yb) doped active fiber. [2-4] A single mode (SM) fiber laser with more than 1kW continuous wave (CW) average power has an excellent beam density of close to 1×109W/cm2 once it is properly focused. This power density level is remarkably high among other CW laser technologies as shown in Fig. 1.

© 2014 Japan Society of Applied Physics, Optical Society of America

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