光程（optical path）是光学领域的一个基础概念，其定义为光传播的几何路程与介质折射率的乘积。光程差（optical path difference）顾名思义，即为两束光光程之差，在几何光学和波动光学中光的干涉、衍射及双折射效应等的推导过程中都具有重要意义。
n. retardation
misc. OPD ; optical path difference
3) 光程差（Optical path difference, OPD）指两束光到达某点的光程之差值，用 来表示光程的差异。
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精确设定瑞利干涉仪补偿器的偏转角 关键词：补偿器；光程差；偏转角；折射率；条纹 [gap=980]Key words: Compensator； Optical distance difference； Deflection angle； Refracting rate； Stripe
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The sensing signal is detected by means of compensating the optical path difference of the two orthogonal polarization modes by two arms path difference of Michelson interferometer.
用迈克尔逊干涉仪两臂光程差来补偿两个偏振模的光程差的方法探测传感信号。
参考来源 - 期刊学术社区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After introducing the spectrometer which is based on the Fresnel-double-mirrors, it’s optical-path difference for the on-focus and off-focus points for several different kinds of apertures, and calculate the light intensity and the visibility of the spectrometer were calculated.
在介绍基于菲涅耳双面镜傅里叶变换光谱仪的基本原理后,计算其系统在不同几何形状光源的情况下的轴上点、轴外点的光程差,进而推导出其光强、可见度的分布。
参考来源 - 基于菲涅耳双面镜傅里叶变换光谱仪的可见度分析·2,447,543篇论文数据，部分数据来源于NoteExpress
最后给出了两种光程差近似计算的正确方案。
Finally, the right project with of approximate calculation difference of light distance is given.
光纤傅里叶变换光谱仪的光谱分辨率是由最大光程差决定的。
Spectral resolution of optical fiber Fourier transform spectrometer depends on maximum optical path difference (OPD).
本文讨论了单球形折射面在傍轴条件下二相邻光束的光程差问题。
The optical path difference of two rays in the condition of near axis is discussed in the single spherical surface refraction.
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