velocity focusing

基本解释

One difficulty with direct methods is that the designer spends a great deal of time focusing on the velocity distribution; the geometry is secondary.
一個直接的方法就是難度設計者花費大量的時間專注於速度分佈；幾何爲輔。
Such as how to select focus functions and focus windows, how to perform feedback control, and how to improve the auto-focusing velocity etc. , are far from completely solved.
在如何選擇對焦評價函數和對焦區域、如何進行反餽控制和如何提高對焦速度等方麪，還有諸多問題有待解決。
The results showed that the effect of group velocity dispersion(GVD) on the pulse with large chip was slight and the effect of spectral width on the self-focusing properties could be ignored.
研究結果表明，群速度色散（GVD）對大啁啾脈沖的影響很小，譜寬對自聚集的影響可以忽略。