HIGH-POWER FIBRE AMPLIFIER AND FIBRE OSCILLATOR

摘要

The invention relates to a high-power fibre laser amplifier (1) having a laser shaft length of between 1060 to 1100 nm, average laser power of more than 500 W and an approximate diffraction-limiting beam quality (M2 1,5). The inventive high power fibre laser amplifier comprises a double-clad-laser fibre (2) which has a separate laser active fibre core (5) having an outer diameter of at least 20 µm, a pump core (6) which surrounds the fibre core (5) and which has an outer diameter of at least 50 µm. The inventive high power fibre laser amplifier also comprises a ytterbium-doped solid body laser (3) which emits the pump light (4), having a wave length of approximately 1030 nm, beam quality of M2 approx. 30 and laser power of at least approximately 600 watts, which is used to pump the double-clad laser fibre (2).