The averagesaturation space-charge field is small and the diffraction efficiency is low as a result of the non-uniformity of the grating.
结果显示,非均匀性致使光折变光栅的平均强度减弱,衍射效率降低。
2
Yet wireless communications in these areas are advancing rapidly at a time when the mobile-phone industry is approaching saturation point in rich countries and the average revenue per user is sagging.