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.
Ultra-low quantum defect operation Er lasers are discussed. Power scaling demonstration has shown promise for high efficiency Er:crystal laser operation.
Fiber laser pumped Er:YOS laser action near 1600 nm was achieved at room temperature. Etalons and a diffraction grating were used to generate and control broad-band laser action near the 1600 nm emission center. Efficient operation was achieved in a non-optimized laser test bed.
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