Evaluation of beam quality of semiconductor lasers by beam parameter product

In order to solve the deficiency of the traditional evaluation method of beam parameter product on laser beam quality, based on the characteristics of semiconductor laser beam, the effective focal length data of 6 combined beams of fast axis collimator (FAC) with focal length 1100μm, 6 combined beams of FAC with focal length 600μm, and 10 combined beams of FAC with focal length 600μm were obtained. The theoretical analysis and experimental verification were carried out. The results show that the more obvious the change of L_// and θ_⊥ is, the more obvious the change of beam parameter product of beam quality is. The error between the measured value and the calculated value is generally less than 5%. This result is helpful for evaluating the beam quality of high energy laser.