2090 nm 200 W Peak Power 50 ns Pulsed PM Ho-Doped Fiber Amplifier Pumped at 1860 nm

We report the design and performance of a 2 mu m dual-stage polarization maintaining (PM) holmium-doped fiber amplifier (HDFA) operating in either continuous-wave (CW) or pulsed regime. The amplifier is pumped at 1860 nm, which offers a better efficiency than a 1940 nm pump. In CW regime, we measured more than 1W of output power at both 2051 nm and 2090 nm signal wavelengths. In pulsed mode, we tested the amplifier over a broad range of pulse widths (50-500 ns) and pulse repetition frequencies (PRFs) (50-1500 kHz). The PM HDFA delivered up to 200 W of peak power and 10 mu J of pulse energy with an excellent stability, while integrated inside a compact module.

Automated summary

The design and performance of a 2 μm dual-stage polarization maintaining holmium-doped fiber amplifier (HDFA) operating in both continuous-wave (CW) and pulsed regime is reported. The amplifier, pumped at 1860 nm, achieved over 1W of output power at 2051 nm and 2090 nm signal wavelengths in CW mode, and delivered up to 200W of peak power and 10 μJ of pulse energy in pulsed mode with excellent stability.