the specimen is lighted from the side, so that only diffracted light from the specimen passes through into the objective 光线从侧面照向标本,这样只有散射光进入显微镜镜头。
for example, when light propagates through a small round hole, by computing the intensity of the diffracted light field, we can obtain the intensity distribution of fresnel and fraunhofer diffracted light field 以光线通过圆形孔径传播为例,对衍射后的光场分布进行数值计算,得到菲涅耳衍射和夫琅和费衍射光场的强度分布。
for example, when light propagates through a small round hole, by computing the intensity of the diffracted light field, we can obtain the intensity distribution of fresnel and fraunhofer diffracted light field 以光线通过圆形孔径传播为例,对衍射后的光场分布进行数值计算,得到菲涅耳衍射和夫琅和费衍射光场的强度分布。
such deviated light ( as you will subsequently learn, called diffracted light ) is rendered one-half wavelength or 180 degrees out of step ( more commonly, out of phase ) with the direct light that has passed through undeviated 这种偏移光(其后我们称之为衍射光)与直射光之间呈现半个波长或180的不同步(一般称之为不同相位)。
however, the intensity gradient ( force ) of the diffracted light of the semi-gaussian beam is far smaller than that of the evanescent-light wave, so its spontaneous emission probability is greater than that from the evanescent-light one when the normal velo city of the incident atom is greater 然而,因为半束兰失谐高斯光束衍射光场的强度梯度力远小于消逝波光场,所以当入射原子速度较大时,原子在半束兰失谐高斯光束衍射光场中的自发辐射几率要大于消逝波光场。