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1. 发明授权

US5665493A Gated recording of holograms using rare-earth doped ferroelectric materials 失效
标题翻译：使用稀土掺杂铁电材料的全息图门控记录
公开(公告)号：US5665493A
公开(公告)日：1997-09-09
申请号：US538704
申请日：1995-10-03
申请人： Yu Sheng Bai , Ravinder Kachru , Lambertus Hesselink , Roger M. Macfarlane
发明人： Yu Sheng Bai , Ravinder Kachru , Lambertus Hesselink , Roger M. Macfarlane
IPC分类号： G11C11/42 , G03H1/02 , G03H1/04 , G11B7/00 , G11B7/0055 , G11B7/0065 , G11B7/243 , G11C13/04
CPC分类号： B82Y10/00 , G11B7/0065 , G11B7/243 , G11C13/042 , G11B7/2433
摘要： Rare earth doped ferroelectric materials are disclosed as reversible holographic recording medium (25) for use in two-photon recording systems. Such rare earth elements provide long-lived electronic states intermediate the ferroelectric material's valence and conduction bands. In some cases, these rare earth intermediate states have a sufficiently long life that low-power continuous wave ("cw") lasers (1) can be used to record interference patterns on them. Thus, two-photon holographic recording systems are also disclosed which do not require high-power, short pulse length, mode-locked or Q-switched lasers. Rather, the disclosed holographic recording systems employ cw lasers such as diode lasers. The rare earth dopants include praseodymium, neodymium, dysprosium, holmium, erbium, and thulium. These dopants provide ions having 4f excited states that give rise to absorptions in the near infra-red and visible spectral regions and typically have lifetimes on the order of 0.1 to 1 milliseconds.The disclosed two-photon holographic recording systems provide for absoption of a first photon which excites electrons of a holographic recording medium to a rare-earth intermediate state. Thereafter, upon absorption of a second photon, the electrons are promoted to the medium's conduction band where they are arranged according to the interference pattern provided by the recording system.
摘要翻译：稀土掺杂的铁电材料被公开为用于双光子记录系统的可逆全息记录介质（25）。这种稀土元素在铁电材料的价带和导带之间提供长寿命的电子态。在某些情况下，这些稀土中间体具有足够长的寿命，可以使用低功率连续波（“cw”）激光器（1）来记录干涉图案。因此，还公开了不需要大功率，短脉冲长度，锁模或Q开关激光器的双光子全息记录系统。相反，所公开的全息记录系统采用诸如二极管激光器之类的cw激光器。稀土掺杂剂包括镨，钕，镝，钬，铒和。。这些掺杂剂提供具有4f激发态的离子，其在近红外和可见光谱区域中产生吸收，并且通常具有0.1至1毫秒量级的寿命。所公开的双光子全息记录系统提供了将全息记录介质的电子激发到稀土中间状态的第一光子的吸收。此后，在吸收第二光子时，电子被提升到介质的导带，它们根据由记录系统提供的干涉图案排列。

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