光初（或作佐初；318年十月—329年八月）是十六国时期前赵政权刘曜的年号，共计12年。
这种效应被称之为“回光”，揭示了自2002年初V838 Mon亮度在几周内突然增大后从未被观测到的尘云图案。
The effect, called a light echo, has been unveiling never-before-seen dust patterns ever since the star suddenly brightened for several weeks in early 2002.
它还十分适用于存在初应力的模型材料光弹性分析问题。
It is also applicable to the problem of photo orthotropic elastic analysis for the model materials with residual stresses.
高效率的孤子激光器所产生的高质量光孤子能为长途光通信准备良好的初条件。
High efficiency soliton laser produces qualified optical solitons that is important for long distant soliton fiber communications.
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