optical spot光点opticaladj.视觉的；光学的optically inactive substance不旋光物Optical code division access光码分多址optical code label switching光码标记交换optical rotational direction旋光方向optical fiber grating filter光纤光栅滤波器optically stimulated crystal光激发晶体optical condition controller光学条件控制器optical rotation instruments旋光仪optical free induction decay光学无感生衰减optical thickness tolerances光学厚度公差