Coherent Diode Array for High Power Optical Transmitter

The proposed project, in partnership with nLight, will demonstrate the feasibility to coherently combine a high-power monolithic array of diode lasers using a Self-Fourier cavity for use in satellite communication systems. The Phase I project will experimentally demonstrate the coherent coupling of a monolithic array of diode lasers emitting at the eyesafe wavelength of 1480 nm manufactured by nLight as well as develop a comprehensive model of operation. The results of the Phase I effort will be an understanding of the intrinsic mechanisms responsible for phase locking, a good understanding of the scaling issues, and a design for Phase II prototype. The Phase II effort will demonstrate a diffraction-limited diode laser source at a power level of more than 10W suitable for satellite communication. Development of this technology will also pave the way for a multi-kW diode laser arrays useful for many other military applications including pumps for high energy solid state laser systems as well as the High Energy Laser itself. BENEFIT: The coherent combination of the multiple outputs from a large monolithic diode laser array will result in greatly increased capabilities in the generation of high brightness laser outputs. This capability will find numerous applications in the commercial market such as fiber laser pumps, medical applications, environmental sensing, advanced LADAR systems, and metal cutting and welding for the automotive and shipbuilding industry.