Since off-axis wander results in images which have astigmatism when the prism is placed in a converging beam, Glan types have slightly better imaging qualities than Nicla types.
因为当棱镜置于会聚光束中时，离轴漂移造成有像散的像，格兰型棱镜的成像质量比尼·科尔型略好。
2
It is shown that the positions of phase saddles and vortices depend on the off-axis parameter, beam width, phase and relative amplitude of beams.
研究表明干涉场中的相位鞍点以及涡旋点的位置与光束的离轴参数、束腰宽度、相位以及相对振幅有关。
3
It is hard to design for beam expander with high power and wide aperture required, because it is shorten length, larger aperture, as well as on axis and off axis aberration must be corrected properly.