Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.
把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。
The accurate expressions to calculate the aberration for two sorts of lens decrease on the increase of gradient index.
严格的数值计算结果表明：两类透镜的纵、横向球差都随折射率梯度的增强而减小。
The spherical gradient refractive index micro-lens with small volume and short optical path can be easily shaped and conveniently adjusted, and has no spiral rays and low spherical aberration.
球对称梯度折射率微球透镜具有体积小、光路短、外形易加工、使用易调整，且无螺旋光线、像差小等优越性能。
By using the matrix optics method, the propagation properties of Gaussian beams through a nonlinear gradient-index lens are studied.
采用矩阵光学方法研究了高斯光束通过非线性梯度折射率透镜的传输特性。
The result shows that eye with gradient-refractive-index-lens and that with shell-lens can get equivalent spherical aberration results.
具有层状结构晶状体的眼睛和具有折射率连续变化的晶状体的眼睛能够给出等价的球差结果。
The scheme includes optimizing the recording and reconstruction geometries and collimating the reconstruction wave with a gradient-index lens.
该方案包括优化记录和重现光路，以及采用自聚焦透镜准直重现光波。
The scheme includes optimizing the recording and reconstruction geometries and collimating the reconstruction wave with a gradient-index lens.
该方案包括优化记录和重现光路，以及采用自聚焦透镜准直重现光波。
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