Design Of Kilowatt-class Fiber Coupling High Power Semiconductor Laser Modules

As a result of the widely application of high power diode lasers in laser remanufacturing and country security,high power laser is a developing trend,due to the limitations of semiconductor lasers,using fiber coupling method to improve beam quality is very important for fiber coupling research of semiconductor lasers,especially high-power semiconductor lasers.This paper is mainly based on the direct application requirements of high-power lasers.The kilowatt-level fiber-optic coupling module of semiconductor laser arrays is studied and analyzed from the aspects of theoretical analysis,program design,and simulation.Based on a mini-bar semiconductor laser fiber coupling module for simulation,36 mini-bar semiconductor lasers with an output power of 80 W are combined to form a two-row space array as a coupling light source.The aspherical lens and microlens array are used to collimate the fast and slow axes respectively.In order to improve the output efficiency and brightness,the straight beam is aligned according to the incoherent beam combining technique,and the combined beam is efficiently coupled into the optical fiber with the numerical aperture of 0.22 and the core diameter of 300 m through the focusing system.The system output power reaches 2706.3W and the fiber coupling efficiency is greater than 93%.