With the improvement of output power, efficiency and reliability, high power semiconductor lasers have been applied in more and more fields. In this paper, a conduction-cooled, high peak output power semiconductor laser array was studied and developed. The structure and operation parameters of G-Stack semiconductor laser array were designed and optimized using finite element method (FEM). A Quasi-continuous-wave (QCW) conduction-cooled G-Stack semiconductor laser array with a narrow spectrum width was fabricated successfully.
A new beam-shaping technique is proposed to improve the beam quality of a high-power diode laser area light source. It consists of two staggered prism arrays and a reflector array, which can cut the slow axis beam twice and rearrange the divided beams in fast axis to make the beam quality of both axes approximately equal. Furthermore, the beam transformation and compression can be carried out simultaneously, and the assembly error of this technique induced by the machining accuracy of prism’s dimensions also can be greatly decreased. By this technique, a fiber-coupled system for one three-bar laser diode stack is designed and characterized. The experimental results demonstrate that the laser beams could be transformed into the required distribution with ∼93.4% reshaped efficiency and coupled into a 400 μm/0.22 NA fiber, which are consistent with the theory.
Laser cladding has become a useful tool in materials processing for improving the surface properties of the substrate
materials, and has been widely used in industry in recent years. In this paper, we study the 3000W CW laser cladding
system based on the high power diode lasers. The beam control method is proposed to reduce the collimated beam
pointing errors caused during the packaging of the laser stack. At the input current of 84A, the output power and the
optical coupling efficiency of this laser cladding system are 3738W and 93.7%, respectively, and at work face the beam
spot size is 2.5mm*7.9mm with symmetry intensity distribution. The laser cladding system is also used in cladding the
nickel powder onto the iron substrate and the nickel powder can be clothed onto steel plate uniformly.