光程是一个折合量，可理解为在相同时间内光线在真空中传播的距离。在传播时间相同或相位改变相同的条件下，把光在介质中传播的路程折合为光在真空中传播的相应路程。在数值上，光程等于介质折射率乘以光在介质中传播的路程。
光程差 [光] optical path difference ; OPD
光程长 optical length ; optical path length
光程长度差 Path length difference
光程长度 [光] optical path length ; Path length
有效光程长度 effective path length
等光程点 [光] aplanatic point ; aplanatic points
光程函数 eikonal function ; eikonal
光程误差 path-length error
发光程度 Glow Threshold
The inherent nonlinerity in the system are analyzed , and the equation of optical path difference(OPD) is given . We obtained the best parameters to decrease the system nonlinerity .
我们着重分析了其系统中存在的固有的非线性，给出了光程差的计算公式，找出了使系统非线性最好的参数匹配，并进行了仿真实验，得到了理想的结果。
参考来源 - 干涉成像光谱仪定标技术研究The location of the zero optical path difference is one of the key factors in scanning white-light interferometry. The measuring principle of scanning white-light interferometry is introduced.
干涉条纹零光程差位置的确定是扫描白光干涉测量的关键技术之一。
参考来源 - 扫描白光干涉测量技术的算法比较·2,447,543篇论文数据，部分数据来源于NoteExpress
LASIK眼科手术是用激光程序从你的角膜移除预定数量的组织。
LASIK is performed using a laser programmed to remove a defined amount of tissue from your cornea.
尽管有种种局限性，作为临床试验的一部分，全部30个患者至少都能够体会到在感光程度和感知物体上的变化。
But despite its limitations all 30 of the people who have received the Argus II as part of clinical trials can, at the very least, now see changes in light levels and detect objects.
文献中光学厚度和光程时常混淆。
Optical depth and optical path are often confused in the literature.
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