二次型复折射率介质中的光导现象  

OPTICAL GUIDING-IN THE COMPLEX QUADRATIC MEDIA

作　　者：施义晋[1] 

机构地区：[1]中国原子能科学研究院,北京市275信箱18102413

出　　处：《强激光与粒子束》1993年第4期533-539,共7页High Power Laser and Particle Beams

摘　　要：本文讨论了n(z,r)=n_0(z)+n_2(z)r^2/r_e^2型复折射率介质中的激光传输问题,给出了激光传输参数(光束半径和波阵面曲率)的演化公式。指出只要存在一定大小的n_(21),在传输过一段特征距离z_c之后,将出现完全光导(即自相似模的传播),而且自相似模是激光体系的特征模式。其传输参数只与n_2有关,而与激光初始参数无关。自相似模必定是高斯球面波,而不是高斯平面波。Laser beam propagation in the media with complex quadratic index of refraction n = n0 + n2r2/ r2e was investigated. The expressions of beam radius, W(z) and curvature of its wave front, R(z) ' were obtained. The self-similar (s.s.) mode (perfect guiding) will occure after propagation distance larger than a characteristic length zc, only if n21≠0. The s.s. mode is a eigenmode of media, its propagation parameters W, R-1 are dependent on n2, but independent of the initial value W0, R0-. At the end, s. s. mode is a Gaussian spherical wave, not the plane wave.

关 键 词：光导 自相似模 激光传输 复折射率 

分 类 号：TN241[电子电信—物理电子学]