A SBIR Phase II contract was awarded to Advalue Photonics in July, 2018 for $748,850.0 USD from the U.S. Department of Defense and United States Air Force.
Ten kW of diffraction-limited output power has been demonstrated, which enables a wide range of new applications from laser welding, laser cutting, and laser drilling to military defense. An isolator is necessary between fiber amplifiers in order to maintain stable operation. We propose to develop and optimize all-fiber isolator using our proprietary Faraday rotation fiber with high Verdet constant. In this SBIR proposal, we propose to increase the throughput power to 500W at 1 micron wavelength and demonstrate all-fiber isolator at 1.55 micron and 2 micron wavelength.