Gaozhan Fang

High power collimated diode laser stack

A high power collimated diode laser stack is carried out based on fast-axis collimation and stack packaging techniques. The module includes ten typical continuous wave (cw) bars and the total output power can be up to 368W at 48. 6A. Using a cylindrical lens as the collimation elements, we can make the fast-axis divergence and the slow-axis divergence are 0.926 4° and 8.206° respectively. The light emitting area is limited in a square area of 18.3 mm×11 mm. The module has the advantage of high power density and offers a wide potential applications in pumping and material processing.

Design of side-pumped Nd : YAG lasers

Design of the typical laser diode side-pumped Nd:YAG rod system has been discussed using the conventional ray tracing method in this paper. Firstly introduce two basic matrices, refractional and translational matrix, described the transmission of nonparaxial light ray in the medium without concerning the absorption of light. And then, using those matrices, analyze the distribution of pump light in the crystal respectively under the condition of directly pumped system and indirectly pumped system with a cylindrical quartz rod as focusing lens. From the result of simulation, we compare the advantage and disadvantage of the two pumped method, and mainly consider how to select the diameter of the focus lens and cooling tube, indicate the effect of deionized water and cooling tube have on the pump light distribution in the active material. At last, make some conclusions about the side-pumped Nd:YAG laser system.