By a method for comparing , the conversion efficiency formula of the gaussian wave for second - harmonic generation ( cefgshg ) in general circumstances , which toke accounts of walk - off effect and self - focus effect together , was attained 通过类比的方法给出了一般情况下，同时考虑走离效应和自聚焦效应时的高斯光束倍频转换效率公式。
The conclusion is that the vectorial effect influences more on the small - scale self - focusing than the non - paraxial effect . a new growing mode existing when the modulation on the direction of polarization is discussed in this chapter 同时与极化方向平行的新的增益模式有可能出现并可以在波长的尺度上产生自聚焦，文章讨论了这种可能性。
The conditions for the long distance propagation are discussed in detail . the results are useful in determining the appropriate size of the channel to be preformed and can guide the future research in ultrashort intense laser propagation 首次利用自恰电子空腔效应分析了超短超强激光在低密度等离子体中的长距离传输和自聚焦效应，详细分析了长距离传输的条件。
The digital oral endoscope is designed and realized in this paper , which is based on the technologies of digital signal processing and database , by using gradient refractive index rod lens , that is grin - lens , and photo - electronic imaging device 摘要以梯度折射率透镜（自聚焦透镜）为摄像镜头，通过光电转换，结合数字信号处理和数据库技术，设计并实现了数字化口腔内窥镜。
We have calculated the effects which gain and loss impose on the formation distances of filaments of small - scale modulations , the results indicate that properly increasing the gain coefficient can counteract the small - scale self - focusing in certain degree 我们初步估算了增益和损耗对于小尺度调制的成丝距离的影响，认为适当地提高增益系数，能够从一定程度上抑制小尺度自聚焦效应。
In a word , this dissertation does n ' t only introduce the two important aspects of high - resolution airborne sar : imaging algorithm and autofocus algorithm , but also applies them in computer simulation and practice , and proves their validity 总之，本文对机载合成孔径雷达高分辨力成像信号处理的两个关键方面成像算法和自聚焦算法做出了详细介绍，并且进行了仿真和应用，验证了他们的有效性。
