短語詞組短語beam ot diameter 束斑直徑Beam waist diameter 光束腰直徑Beam flange diameter 織軸盤片直徑beam spot diameter 束斑直徑parallel beam diameter 平行光斑直徑lasing beam diameter 激光束直徑testing beam diameter 測試口徑effective beam diameter 有效束徑Beam diameter at aperture 出光孔處光斑直徑;光束直徑;出口光斑 返回 beam diameter