Ryskin Alexander I, Shcheulin Alexander S, Angervaks Alexander E
National Research University of Information Technologies, Mechanics and Optics, 49, Kronverkskiy pr., St. Petersburg 197101, Russia.
Materials (Basel). 2012 May 7;5(5):784-817. doi: 10.3390/ma5050784.
Monocrystalline cadmium fluoride is a dielectric solid that can be converted into a semiconductor by doping with donor impurities and subsequent heating in the reduction atmosphere. For two donor elements, Ga and In, the donor ("shallow") state is a metastable one separated from the ground ("deep") state by a barrier. Photoinduced deep-to-shallow state transition underlies the photochromism of CdF₂:Ga and CdF₂:In. Real-time phase holograms are recorded in these crystals capable of following up optical processes in a wide frequency range. The features of photochromic transformations in CdF₂:Ga and CdF₂:In crystals as well as holographic characteristics of these media are discussed. Exemplary applications of CdF₂-based holographic elements are given.
单晶氟化镉是一种介电固体，通过掺杂施主杂质并随后在还原气氛中加热可将其转变为半导体。对于两种施主元素Ga和In，施主（“浅”）态是一种亚稳态，与基态（“深”）态之间存在一个势垒。光致深态到浅态的转变是CdF₂:Ga和CdF₂:In光致变色的基础。在这些晶体中能够记录实时相位全息图，其能够在很宽的频率范围内跟踪光学过程。讨论了CdF₂:Ga和CdF₂:In晶体中光致变色转变的特征以及这些介质的全息特性。给出了基于CdF₂的全息元件的典型应用。
