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1)  walk-off angle
离散角
1.
When light transmits through aeolotropic crystal,as far as extraordinary light is concerned,there is a smaller included angle between the ray and the wave normal in general,which is usually called walk-off angle.
光在各向异性晶体中传播时,e光的光线方向与光波法线方向一般有一个较小的夹角,即离散角α。
2.
Aim To study the effects of walk-off angle on the coefficients of reflection and transmission.
目的 研究离散角对反射与透射系数的影响 。
3.
Considering the effect of walk-off angle, the accurate calculation of effective nonlinear optical coefficient of uniaxial crystal is presented, a example of calculation of BBO is given.
考虑到离散角的影响,给出了单轴晶体中有效非线性极化系数的精确计算公式,并给出了计算举例。
2)  angle straggling
角离散
3)  the diasporic perspective
离散视角
1.
Based on the analysis of the masterpieces of three leading figures in Chinese American literature,this thesis will take a new multidisciplinary approach to explore the special quality of Chinese American writers and their works----"hybridity" by means of the combination of postcolonial translation theory,the diasporic perspective in cultural study and narratology.
华裔美国文学的研究热点通常集中在华裔美国人的文化身份以及与之相关的文化冲突方面,而对华裔作品本身的文化翻译属性论述不多,其中从离散视角切入的更寥寥无几。
4)  Angular discretization
角度离散
5)  Trigonal slice discrete
三角片离散
6)  compensation of the walk-off angle
离散角补偿
1.
The parametric light resulted from two BBO crystals with changed compensation of the walk-off angle is extended to ultraviolet wavelengths ranging from 205 nm to 350 nm, by taking the 354.
以355nm的主被动锁模YAG激光器输出的皮秒单脉冲做为泵浦源,利用非线性激光晶体BBO的倍频调谐特性,将改进型的离散角补偿的双晶BBO晶体产生的参量光,采用双块BBO晶体把参量光倍频,即可得到调谐范围为205~350nm的紫外高功率激光输出。
补充资料:离散时间周期序列的离散傅里叶级数表示
       (1)
  式中χ((n))N为一离散时间周期序列,其周期为N点,即
  式中r为任意整数。X((k))N为频域周期序列,其周期亦为N点,即X(k)=X(k+lN),式中l为任意整数。
  
  从式(1)可导出已知X((k))N求χ((n))N的关系
   (2)
  式(1)和式(2)称为离散傅里叶级数对。
  
  当离散时间周期序列整体向左移位m时,移位后的序列为χ((n+m))N,如果χ((n))N的离散傅里叶级数(DFS)表示为,则χ((n+m))N的DFS表示为
  

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