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    • 3. 发明授权
    • Multiplexing and selective updatable fixing and erasing of volume
holograms in photorefractive media and second harmonic generation in
photorefractive media by optically induced periodic poling
    • 光折射介质中体积全息图的复用和选择性可更新固定和擦除,光折射介质中的二次谐波生成
    • US5422873A
    • 1995-06-06
    • US37076
    • 1993-03-25
    • Anthony S. KewitschMordechai SegevAmnon Yariv
    • Anthony S. KewitschMordechai SegevAmnon Yariv
    • G03H1/26G11C13/04G11B7/00
    • G11C13/042G03H1/2645G03H1/0248G03H2001/0268G03H2001/2615G03H2260/35
    • New methods are presented for multiplexing volume holograms in electrooptic materials. Multiple volume holograms can be superimposed in a medium and be individually addressed by tuning the underlying refractive index of the medium or the crystal parameters, while keeping the external parameters (wavelength, angles) fixed. According to the presented methods, the refractive index and crystal parameters of the material can be varied via the electrooptic, elastooptic or piezoelectric effects, alone or in combination with each other, by tuning the value of an applied electric field, or by tuning an applied mechanical stress, or by changing the material temperature. Volume holograms that have been multiplexed by either wavelength or angle or electric field or mechanical stress or temperature can be individually addressed by any one of the same five parameters. Additionally, selective, updatable fixing and erasing of volume holograms in photorefractive media is described. Each holographic page may be fixed individually and overwritten without destroying the other fixed pages. Further, Second Harmonic Generation and Parametric Amplification by optically induced periodic poling in ferroelectric photorefractive materials is described.
    • 提出了新的电光学材料中多重体积全息图的方法。 多个体积全息图可以叠加在介质中,并通过调节介质的潜在折射率或晶体参数,同时保持外部参数(波长,角度)固定而单独寻址。 根据所提出的方法,材料的折射率和晶体参数可以通过电光,弹性或压电效应单独或彼此组合,通过调节所施加的电场的值,或通过调谐施加的 机械应力,或通过改变材料温度。 通过波长或角度或电场或机械应力或温度复用的体积全息图可以通过相同的五个参数中的任何一个来单独寻址。 另外,描述了在光折射介质中的体积全息图的选择性,可更新的固定和擦除。 每个全息页可以单独固定和重写,而不会破坏其他固定页。 此外,描述了在铁电光折变材料中的光诱导周期极化的第二谐波产生和参数放大。
    • 4. 发明授权
    • Optical pin-point microphone
    • 光学针尖麦克风
    • US09277330B2
    • 2016-03-01
    • US12567325
    • 2009-09-25
    • Abraham AharoniMordechai SegevZvi Katz
    • Abraham AharoniMordechai SegevZvi Katz
    • H04R23/00H04R25/00
    • H04R23/008H04R25/405
    • A system and method for directional sound sensing directs an optical sensing beam to an object of interest having a rough surface that vibrates acoustically. The light is reflected thereby and scattered as a speckle pattern that includes multiple speckles having a random distribution of phase offsets. A detector array having multiple detector elements receives and detects the speckle pattern and produces signals that are linearly proportional to phase modulation of the speckles. A summer receives signals from at least two of the detector elements that are offset at different phases and sums the received signals to generate a non-vanishing signal representative of an acoustic signal.
    • 用于定向声音感测的系统和方法将光学感测光束引导到具有声学振动的粗糙表面的感兴趣对象。 光被反射并散射为散斑图案,其包括具有相位偏移的随机分布的多个斑点。 具有多个检测器元件的检测器阵列接收并检测斑点图案并产生与斑点相位调制成线性比例的信号。 夏天从不同相位偏移的至少两个检测器元件接收信号,并且对接收到的信号求和以产生表示声信号的非消失信号。