3 . we study how to improve the pump efficiency in a double clad fiber laser . several traditional pumping methods are considered and the light propagation 其中双包层光纤的结构、内包层的形状、泵浦光入纤方式等是这项技术的关键所在。
This paper makes analysis and comparison of the symbolic rules in different optical books , and brings to light the internal relations and integrity of the superiorest symbolic rule with the law of light propagation and imaging 本文对不同光学书上采用的符号法则进行了分析比较,揭示出了表观上最优的符号法则与光的传播及成象规律的内在联系及统一性
Second , negative dispersion without absorption , which leads to superluminal light propagation , is achievable in the central resonance structure of the dispersion spectrum . the negative dispersion is slightly weakened as the spacings between dressed states increase 其次,在色散光谱的中心区域,呈现出无吸收负色散,这种效应能够导致超光速传播,但它随着修饰态间距增加而减弱。
Firstly , in this paper the theory of light propagation and diffusion is introduced . the software of femlab based on finite element method is used to simulate the nir light fluence in the tissue , which is just the forward problem of optical ct 本文首先介绍了光在组织中的传输及其扩散近似理论,并用基于有限元方法( fem )开发的femlab软件模拟了光在生物组织中的分布,此即光学ct的正向问题。
Under the condition of the same total power , both large single beam and small multi - beam can enlarge the lateral area of the light propagation effectively , but the maximal light absorption rate increases for latter approach 在总功率相同的情况下,使用单束大功率宽光源与多束功率较小的小光斑光源均能明显地增大光的侧向传播距离,但使用多束功率较小的小光斑光辐照时生物组织中的最大光吸收率增大。