Kilowatt-output and high beam quality diode laser linear array coupling source

The application of high power diode lasers is severely limited by their poor beam quality. In order to meet the increasing demands for industrial and defense applications, it is important to develop diode laser sources with both high power and high beam quality. The technology of linear array coupling is applied to multiplex twenty passively cooled diode lasers. 45°tilted cylindrical lens arrays and collimators are recommended to make the beam sizes and divergences of fast and slow axes equal, respectively. Wavelength coupling and polarization coupling finally are followed. A dual-wavelength of 808 nm and 870 nm diode laser coupling source is successfully developed, with continuous output power of 1030 W, beam parameter products of fast and slow axes of 18.3 mm · mrad and 17.7 mm · mrad, respectively, and maximum electro-optical conversion efficiency up to 44%. High efficiency, high power and high beam quality laser output is achieved. It can be used as direct source in industrial and defense areas.