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公开(公告)号：US5566382A
公开(公告)日：1996-10-15
申请号：US570279
申请日：1995-12-11
CPC分类号： G02B26/08 , G01S13/9005
摘要： A SAR radar has an optical processor which uses an electrical-signal-to-light modulator. The modulator includes a tapped delay line which may be either analog or digital, and the signals tapped from the delay line are applied to an array of temporary storage elements, which in the case of analog signals may be a capacitive sample-and-hold, or for digital signals may include storage registers. In order to improve the signal-to-noise ratio (SNR) by comparison with a processor using an acoustic modulator, the signals tapped from the delay line are sampled at a display sampling rate, which is very low by comparison with the signal sampling rate or the highest frequency of interest, and the sampled signals are held until the next following display rate pulse. The signals held in the temporary storage elements are applied to the modulator elements, so that the optical pattern remains fixed for relatively long periods of time during which the optical processing can integrate photons for improved SNR.
摘要翻译： SAR雷达具有使用电信号到光调制器的光学处理器。 调制器包括可以是模拟或数字的抽头延迟线，并且从延迟线抽头的信号被施加到临时存储元件阵列，在模拟信号的情况下可以是电容采样保持， 或者对于数字信号可以包括存储寄存器。 为了通过与使用声学调制器的处理器进行比较来提高信噪比（SNR），从延迟线抽头的信号以显示采样率进行采样，其显示采样率与信号采样率相比非常低 或感兴趣的最高频率，并且保持采样信号直到下一个跟随显示速率脉冲。 保存在临时存储元件中的信号被施加到调制器元件，使得光学图案保持固定相对较长的时间段，在该时间期间光学处理可以集成光子以改善SNR。
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公开(公告)号：US6045888A
公开(公告)日：2000-04-04
申请号：US440280
申请日：1995-05-12
申请人： Wenpeng Chen , Shekhar Guha , Terrance L. Worchesky , Kenneth J. Ritter , Maher E. Tadros , Keith Kang
发明人： Wenpeng Chen , Shekhar Guha , Terrance L. Worchesky , Kenneth J. Ritter , Maher E. Tadros , Keith Kang
CPC分类号： G11C13/041 , Y10S428/913 , Y10S430/146 , Y10T428/21
摘要： An optical memory material includes a two-photon storage component which can be written from a first to a second state in response to WRITE light, mixed with a signal component which fluoresces by one-photon absorption only at the written locations in response to READ light. The storage material may be a fulgide. The memory material may also include a frequency upconversion material to aid writing. Writing is performed by a spatial light modulator (SLM) with a dynamic focussing system, for concentrating sufficient power at WRITE locations for nonlinear two-photon absorption. Crosstalk is avoided during simultaneous writing in some embodiments, by spacing the individual WRITE beams apart by an integer number of inter-beam spacings, so that non-adjacent datels are written simultaneously in a "paragraph," and the non-written areas are written at a different time with different paragraphs. The memory material may be translated relative to the SLM to access different paragraphs, or accessed by an electronically sparsed SLM. Reading uses a sheet of READ light traversing the pages of written material to cause the signal component to fluoresce, and imaging the fluorescent pattern onto a detector array. The memory material may be stacked in layers, spaced apart by light waveguides, for guiding the READ beam to the page to be read. In another embodiment, writing and erasure are performed by a modulated quasi-one-dimensional sheet of light, intersecting a second, unmodulated sheet of light at a column within the memory material.
摘要翻译： 光学存储材料包括双光子存储组件，其可以响应于写入光而从第一状态到第二状态写入，仅响应于读取光而在写入位置处与单光子吸收发荧光的信号分量混合 。 存储材料可以是一种俘获物。 存储器材料还可以包括用于辅助写入的上变频材料。 写入由具有动态聚焦系统的空间光调制器（SLM）执行，用于在写入位置集中足够的功率用于非线性双光子吸收。 在一些实施例中，通过将各个写入光束间隔开整数个光束间距来避免串扰，从而在“段落”中同时写入不相邻的数据，并且写入非写入区域 在不同的段落与不同的段落。 存储器材料可以相对于SLM被翻译以访问不同的段落，或者通过电子分段的SLM访问。 读数使用一张通过写入材料页面的READ光线使信号分量发荧光，并将荧光图案成像到检测器阵列上。 存储器材料可以堆叠成层，由光波导间隔开，用于将读取光束引导到要读取的页面。 在另一个实施例中，写入和擦除通过调制的准一维光束进行，与存储器材料内的列处的第二未调制的光束相交。
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公开(公告)号：US5472759A
公开(公告)日：1995-12-05
申请号：US168733
申请日：1993-12-16
申请人： Wenpeng Chen , Shekhar Guha , Terrance L. Worchesky , Kenneth J. Ritter , Maher E. Tadros , Keith Kang
发明人： Wenpeng Chen , Shekhar Guha , Terrance L. Worchesky , Kenneth J. Ritter , Maher E. Tadros , Keith Kang
CPC分类号： G11C13/041 , Y10S428/913 , Y10S430/146 , Y10T428/21
摘要： An optical memory material includes a two-photon storage component which can be written from a first to a second state in response to WRITE light, mixed with a signal component which fluoresces by one-photon absorption only at the written locations in response to READ light. The storage material may be a fulgide. The memory material may also include a frequency upconversion material to aid writing. Writing is performed by a spatial light modulator (SLM) with a dynamic focussing system, for concentrating sufficient power at WRITE locations for nonlinear two-photon absorption. Crosstalk is avoided during simultaneous writing in some embodiments, by spacing the individual WRITE beams apart by an integer number of inter-beam spacings, so that non-adjacent datels are written simultaneously in a "paragraph," and the non-written areas are written at a different time with different paragraphs. The memory material may be translated relative to the SLM to access different paragraphs, or accessed by an electronically sparsed SLM. Reading uses a sheet of READ light traversing the pages of written material to cause the signal component to fluoresce, and imaging the fluorescent pattern onto a detector array. The memory material may be stacked in layers, spaced apart by light waveguides, for guiding the READ beam to the page to be read. In another embodiment, writing and erasure are performed by a modulated quasi-one-dimensional sheet of light, intersecting a second, unmodulated sheet of light at a column within the memory material.
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公开(公告)号：US5488504A
公开(公告)日：1996-01-30
申请号：US109550
申请日：1993-08-20
CPC分类号： B82Y20/00 , G02F1/218 , G02F1/017 , G02F2203/12
摘要： A device for converting a set of electronic signals that represent an image into a coherent image includes a two-dimensional array of asymmetric Fabry-Perot (ASFP), quantum-well-based optical modulators connected on a pixel-by-pixel basis to a two-dimensional array of drive circuits located on an integrated circuit. Electronic signals received by the integrated circuit cause the pixel drive circuits to change a bias voltage applied across the optical modulator section and, thereby, change the optical properties of the optical modulator section of the device. The two-dimensional array can be used to impart intensity-only, phase-only, or phase-and-intensity variations onto a beam of coherent laser light incident on the array. This coherent image can be used with other optical elements to form optical processing machines and optical storage devices.
摘要翻译： 用于将表示图像的一组电子信号转换为相干图像的装置包括不对称Fabry-Perot（ASFP）的二维阵列，基于量子阱的光学调制器，以逐个像素为基础连接到 位于集成电路上的驱动电路的二维阵列。 由集成电路接收的电子信号使得像素驱动电路改变施加在光调制器部分上的偏置电压，从而改变器件的光调制器部分的光学特性。 二维阵列可用于将强度，相位或相位和强度变化赋予入射到阵列上的相干激光束。 该相干图像可以与其他光学元件一起使用以形成光学处理机器和光学存储设备。
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公开(公告)号：US4325635A
公开(公告)日：1982-04-20
申请号：US194736
申请日：1980-10-07
CPC分类号： G01N21/45
摘要： A method and apparatus for simply and accurately determining the index of refraction of semiconductor materials, etalon bars and materials transparent to infrared radiation. The channel spectra of the material is obtained by passing through it a portion of radiation from a continuously tuned diode laser. Another portion of the diode laser radiation is heterodyned with radiation from a CO.sub.2 laser to obtain heterodyne marker beats. The channel spectra and marker beats are displayed in conjunction whereby the frequency difference between the marker beats can be related to the number of fringes in the channel spectra between the marker beats.
摘要翻译： 用于简单且准确地确定半导体材料，标准杆和对红外辐射透明的材料的折射率的方法和装置。 该材料的通道光谱是通过将来自连续调谐的二极管激光器的一部分辐射通过来获得的。 二极管激光辐射的另一部分与来自CO2激光器的辐射进行外差，以获得外差标记拍子。 通道频谱和标记节拍结合显示，由此标记节拍之间的频率差可以与标记节拍之间的通道光谱中的条纹数量相关。
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