We describe our approach and latest results for Raytheon's RELI (Robust Electric Laser Initiative) program. Our
architecture leverages a slab-based, Master Oscillator / Power Amplifier (MOPA) architecture based on Raytheon's
unique planar waveguide amplifier. Technical objectives for this effort are to demonstrate > 25 kW output with
excellent beam quality and an electrical to optical efficiency > 30%. The planar waveguide architecture provides
compact packaging and is inherently scalable to 100 kW or greater in a single beam line. We report on the latest
progress and test results for the program.
We have demonstrated stable operation of a 2-kW Yb:YAG phase-conjugate master oscillator,
power amplifier (PC-MOPA) laser system with a loop phase-conjugate mirror (LPCM). This is
the first demonstration of a CW-input LPCM MOPA operating at a power greater than 1 kW
with a nearly diffraction-limited output beam. The single-pass beam quality incident on the
LPCM varied with the specific operating conditions, but it was typically ~ 20 times diffraction-limited
(XDL). The measured beam quality with a MOPA output power of 1.65 kW was
1.3 XDL.
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