the specimen is lighted from the side, so that only diffracted light from the specimen passes through into the objective 光線從側(cè)面照向標(biāo)本,這樣只有散射光進(jìn)入顯微鏡鏡頭。
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 以光線通過(guò)圓形孔徑傳播為例,對(duì)衍射后的光場(chǎng)分布進(jìn)行數(shù)值計(jì)算,得到菲涅耳衍射和夫瑯和費(fèi)衍射光場(chǎng)的強(qiáng)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 以光線通過(guò)圓形孔徑傳播為例,對(duì)衍射后的光場(chǎng)分布進(jìn)行數(shù)值計(jì)算,得到菲涅耳衍射和夫瑯和費(fèi)衍射光場(chǎng)的強(qiáng)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 這種偏移光(其后我們稱之為衍射光)與直射光之間呈現(xiàn)半個(gè)波長(zhǎng)或180的不同步(一般稱之為不同相位)。
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?yàn)榘胧m失諧高斯光束衍射光場(chǎng)的強(qiáng)度梯度力遠(yuǎn)小于消逝波光場(chǎng),所以當(dāng)入射原子速度較大時(shí),原子在半束蘭失諧高斯光束衍射光場(chǎng)中的自發(fā)輻射幾率要大于消逝波光場(chǎng)。