Progress in Joule-Class Diode Laser Bars and High Brightness Modules for Application in Long-Pulse Pumping of Solid State Amplifiers - Photonics West 2017
Progress in the development of highly brilliant pump modules based on novel high-energy-class diode laser bars is presented, targeting long-pulse (2 ms) application in pumping Yb:CaF2 amplifier crystals. Bars with long resonators and high fill factors are used for low resistance and efficient cooling. Advanced extremedouble asymmetric epitaxial structures are used for high efficiency at high power. Facet passivation is used for long life at high powers, enabling operation at 600 W per bar (1.2 J). Performance of bars and passively cooled stacks is summarized and prospects for further performance enhancements are reviewed.