按照SCI要去润色这段话：Three LD arrays are symmetrically arranged around the reflector in a threefold fashion The inner surface of the reflector has a high reflectivity R97 which enables the pump light to be fu

Three LD arrays are symmetrically arranged around the reflector in a threefold configuration. The reflector's inner surface has a high reflectivity (R>97%), ensuring that the pump light is fully absorbed by the rod and resulting in a uniform pump distribution. To optimize performance, the setup allows for efficient utilization of the pump light.