2 kW (2 + 1) GT-wave fiber amplifier

Abstract

We report on a home-made 2 kW (2 + 1) GT-wave fiber, and demonstrated its use in the creation of a bidirectional pump amplifier. The constructed all-fiber master oscillator power amplifier system allowed for 2.65 kW aggregated pump power from four 976 nm-laser-diode ports simultaneously and generated a 2.02 kW laser output with optical-to-optical efficiency of 67.8% at 1064 nm. This bi-directional pump GT-wave fiber amplifier sytem showed excellent stability at 1.35 kW, and the laser beam quality factor M2 was measured to be 2.8.