Rouke J L, Moore D T
Institute of Optics, University of Rochester, Wilmot Building, River Campus Station, Rochester, New York 14627, USA.
Appl Opt. 1999 Nov 1;38(31):6574-80. doi: 10.1364/ao.38.006574.
Stress birefringence can be found in gradient-index (GRIN) materials because they contain a variation in composition. GRIN glass fabricated by ion exchange may contain stress from two different processes. These include a size difference between the exchange and the diffusing ions and a variation in the thermal-expansion coefficient across the gradient region. The optical properties of the stressed material are polarization dependent, and therefore image quality is directly affected. We examine birefringence in GRIN rod lenses that have lengths more than ten times greater than their diameters. The effects are more easily observed in long rod lenses because of the large optical path lengths.
应力双折射可在梯度折射率（GRIN）材料中发现，因为它们的成分存在变化。通过离子交换制造的GRIN玻璃可能包含来自两种不同过程的应力。这些包括交换离子和扩散离子之间的尺寸差异以及梯度区域内热膨胀系数的变化。受应力材料的光学特性与偏振有关，因此图像质量会直接受到影响。我们研究了长度超过直径十倍以上的GRIN棒透镜中的双折射。由于光程长度较大，在长棒透镜中更容易观察到这些效应。
