Publications
Efficient cryogenic near-infrared Tm:YLF laser
Summary
Summary
Operation of a cw thulium laser emitting at 816 nm has been demonstrated in bulk Tm:YLF with 46% slope efficiency. Prior cw demonstrations of this transition have been limited to ZBLAN fiber hosts and prior lasing in bulk crystalline host material has been limited to quasi-cw operation due to population...
Diode-pumped narrow linewidth multi-kW metalized Yb fiber amplifier
Summary
Summary
We investigate high brightness pumping of a multi-kW Yb fiber amplifier in a bi-directional pumping configuration. Each pump outputs 2 kW in a 200 um, 0.2 NA multi-mode fiber. Gold-coated specialty gain fibers, with 17 um MFD and 5-dB/meter pump absorption, have been developed. The maximum fiber amplifier output power...
Coherent combining of a 4 kW, eight-element fiber amplifier array
Summary
Summary
Commercial 0:5kW Yb-doped fiber amplifiers have been characterized and found to be suitable for coherent beam combining. Eight such fiber amplifiers have been coherently combined in a tiled-aperture configuration with 78% combining efficiency and total output power of 4kW. The power-in-the-bucket vertical beam quality of the combined output is 1.25...
Coherent beam combining of large number of PM fibres in 2-D fibre array
Summary
Summary
Coherent combining of a record 48 PM fibres in a phased array configuration is reported. The resulting Strehl ratio degrades by