China-made 245 W fiber laser in all-fiber format

An all-fiber configuration master oscillator power amplification (MOPA) structured high power laser with China-made components is constructed. The fiber laser is composed of a 10 W seed laser and a high power fiber amplifier. A maximum output of 245 W centered at 1 080 nm is achieved at the launched pump power of 356 W. The optical to optical conversion efficiency is 69%. The power fluctuation is less than 1% within half an hour. The experimental results have demonstrated the potential for higher output power with more powerful pump source.