Optimized Design for Enhanced Absorption Efficiency and High-Power Laser Output

To optimize the absorption efficiency of the crystal, it's crucial to minimize the inner diameter of the ceramic reflector [14]. Therefore, we designed the reflector with a minimum inner diameter of 8 mm and the glass tube with an inner diameter of 6 mm, while ensuring efficient cooling of the crystal. This design allows for a shorter distance of only 6 mm from the LD emitting surface to the center of the crystal axis, resulting in a higher pumping light power density within the crystal rod. Consequently, this design facilitates the achievement of high-power laser output.