熔融石英材料的色散与棱镜对的色散补偿

Abstract

本文从电偶极振子模型出发，运用塞尔迈耶公式，计算出从紫外至近红外波段熔融石英材料的二阶与三阶色散值。受激发射占主导作用使激光晶体在其增益峰的长波侧表现为正的二阶色散值。采用棱镜对来获得二阶负色散是色散补偿的简单易行的方法。研究了二阶色散完全补偿时熔融石英棱镜对的设计，得到了棱镜的顶角及两棱镜顶之间距离的表达式。 The Group Velocity Dispersion (GVD) and the Third Order Dispersion (TOD) of the fused quartz are calculated by adopting the Sellmeier-formula from the electric dipole resonance model. The stimulated radiation has dominating effect on the GVD of a laser crystal, thus a positive GVD will usually come forth when the work wavelength locates in the longer side of a Gain Mountain. For dispersion compensation, to apply a prism pair is a simple and convenient means to get negative GVD. The design of the prism pair of the fused quartz is researched, and the apex angle and the distance from an apex to another apex of prisms are expressed.