Research On High-Efficient Coupling Technology Of The Large-Scale Diode Arrays

High-efficient coupling technology is the key technology of the high power diode-pumped solid state laser systems. It includes the requests of two respects: condense the pump radiation of large-scale diode arrays efficiently, thus in gain medium realize the high density of energy storage; improve space distribution of the pump radiation, realize perfect pumping-uniformity in the gain medium. This thesis had carried on detailed research to the high-efficient coupling technology suitable for the large-scale diode arrays.Found with the contrast through an analysis of various kinds of coupling ways in recent years at first, hollow lensduct coupling was the most suitable way for the large-scale diode arrays at present. Utilize the three-dimensional DPSSL simulation software of independent development, an overall research of the hollow lensduct had been carried on; especially the impact on coupling result of every parameter, thus the design method of the hollow lensduct coupling system was summarized. Hollow lensduct coupling system, which designed according to the method, could condense the pump radiation efficiently with perfect pumping-uniformity. In the situation that the reflection loss of the duct inwall was not in considering, even condensed the pump beam 100 times, it could realize the output efficiency of more than 70%, this was that the other coupling way hardly to accomplish. As one of the key technology of high power DPSSL, the high-efficient coupling problem of the large-scale diode arrays got a very good settlement.The hollow lensduct coupling system was applied to the design of 10J diode pump repeated frequency solid state laser system. 16kW and 48kW end-pump disk amplifier were designed, they condensed the pump radiation of the two diode arrays of 36 times and 27 times separately, which average radiant intensity were lower than 0.5kW/cm~2. The pump intensity on the effective area of the gain medium exceed 10kW/cm~2 with a modulate degree of below 1.2. The effective energy storage and uniformity in the gain medium had all reached the systematic designing requirement. The system scheme of 10J repeats frequency DPSSL system was briefly analyzed, and the transmission of the laser in the system was simulated by SG-99 software. The multi-pass scheme of the disk amplifiers was confirmed. In the situation that the system losses were fully considered, the energy and space distribution of the system output was provided. The optic-to-optic efficiency of the multi-pass disk amplifier system exceeds 15%, which was at the same level with the Mercury system of Lawrence Livermore...