Abstract
We demonstrate a monolithic continuous wave (CW) fiber laser source at 1070 nm, producing 2 kW laser power with a very narrow spectral width () and near-diffraction-limited beam quality (). The laser consists of a CW fiber laser oscillator and two double cladding fiber amplifiers in the master oscillator-power amplifier configuration. The master oscillator is a distributed Bragg reflected fiber laser, producing laser power with spectral width. The two double cladding fiber amplifiers were developed to enhance the laser power up to and , respectively. The slope efficiency of the main amplifier reaches 84.8%. Under the full power output, the 3 dB spectral width and 20 dB spectral width of the laser emission spectrum was and 1.2 nm, respectively.
© 2015 Optical Society of America
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