石英光纤中受激喇曼散射光谱形成及其能量转换

将泵浦光产生的受激喇曼散射（ Ｓ Ｒ Ｓ） 光谱看作新的独立的单色光源，在光纤内传播的过程中，每个光源按喇曼增益曲线各自独立地激发新的斯托克光谱， 因此 Ｓ Ｒ Ｓ 光谱曲线是光谱内无数个单色光源之间相互吸收相互放大的结果。据此，建立耦合波方程，利用 Ｒｕｎｇｅ － － Ｋｕｔｔａ方法可以计算 Ｓ Ｒ Ｓ 光谱。文中讨论了一阶斯托克光谱的形成，同阶斯托克光谱内的能量红移现象，高阶斯托克光之间以频移４４０ ｃｍ － １ 传递能量以及频带展宽等问题

Formation of SRS spectrum and its energy transformation in silica fiber

Stimulated Raman scattering (SRS) spectrum is produced by laser pumping in silica fiber.The entire spectral regions are divided into a number of small frequency intervals with width of 10 cm.The intensity in each interval is regarded as a light source. As the light travels in fiber, each source will independently excite new SRS spectrum. As a result,SRS spectrum exhibts numerous light sources absorbing and amplifying with each other. Accordingly, the couple differential equations are established. SRS spectrum can be calculated by solving the equation with Runge-Kutta method. The formation of the Stokes spectrum is also discussed as well as the energy red shift in the Stokes spectrum, the energy transfer among different high order Stokes and the spectrum band broadening,etc.