Mini-bar based diode lasers with high brightness, high power

With the output power of fiber laser increasing, fiber laser pumping module have demonstrated an increased need for higher brightness fiber coupled diode lasers. To enhance the output power of fiber coupled laser diode module further, the fiber coupled method with mini-bar was proposed. In this paper, base on mini-bar architecture, high brightness fiber coupled laser diode module has been developed. The combination of recently designed mini-bar and optimized micro-optics results in fiber coupled laser module with up to 26.2W out of a 200μm fiber with a 0.2 NA and >85% fiber coupling efficiency out of the fiber core, Additionally, this module is demonstrated 20.6W coupled into a 105μm, 0.2 NA fiber with >67% fiber coupling efficiency. These modules address the need in the market for higher brightness diode lasers for pumping fiber lasers.