束衰减 beam attenuation

波束衰减器 beam attenuator

光束衰减器 [光] beam attenuator

可变光束衰减器 variable beam attenuator

宽束的衰减 broad beam attenuation

光束衰减系数 beam attenuation coefficient

宽束衰减 attenuation broad-beam ; broad-beam attenuation

细束衰减 attenuation narrow-beam

窄束衰减 narrow-beam attenuation

衰减约束系统 ARS