公开(公告)号：WO1996032658A1

公开(公告)日：1996-10-17

申请号：PCT/US1996005063

申请日：1996-04-12

Applicant: ACCUWAVE CORPORATION

Inventor： ACCUWAVE CORPORATION ,  RAKULJIC, George, Anthony ,  LEYVA, Victor ,  SAYANO, Koichi ,  O'CONNOR, Arthur, Bruce ,  TYLER, Charles, E. ,  MAO, Xiaoping ,  MILLER, Harold, Everett, Jr. ,  YARIV, Amnon

IPC: G02B05/32

CPC classification number: G02B6/4215 ,  G02B5/1857 ,  G02B5/203 ,  G02B5/32 ,  G02B6/12007 ,  G02B6/2706 ,  G02B6/29308 ,  G02B6/2931 ,  G02B6/29311 ,  G02B6/29314 ,  G02B6/29395 ,  G03H1/02 ,  G03H1/0248 ,  G03H1/28 ,  G03H2001/026 ,  G03H2001/0268 ,  G03H2001/0439 ,  G06K9/76 ,  G11B7/0065 ,  G11C13/044 ,  H01S3/08009 ,  H01S3/109 ,  H01S3/16

Abstract: Substantial improvements in photorefractive device lifetimes are provided by control of electron migration which results in the decay of gratings in photorefractive materials due to diffusion and other effects. A new class of photorefractive devices (16) using compensating electronic and ionic gratings having relatively low efficiency but nonetheless usable gratings is provided by arranging the gratings to be reflective in a wavelength band outside the photo-excitation band of the photorefractive material, as by using an infrared operating wavelength. Longer lifetimes in high efficiency gratings are achieved by constant or periodic illumination of photorefractive materials (60, 98, 110, 118) to assure uniform charge distribution of electrons and maintenance of the ionic backbone grating.

Abstract translation: 通过控制电子迁移来提供光折射器件寿命的实质性改进，这导致光折射材料中的光栅由于扩散和其他影响而衰减。 使用具有相对低效率但仍然可用的光栅的补偿电子和离子光栅的新类型的光折射装置（16）通过将光栅布置成在光折射材料的光激发带外部的波长带内被反射的方式来提供，如通过使用 红外线工作波长。 通过光折射材料（60,98,110,118）的恒定或周期性照明来实现高效光栅的寿命更长，以确保电子的均匀电荷分布和离子主干光栅的维持。

公开(公告)号：WO1993003427A2

公开(公告)日：1993-02-18

申请号：PCT/US1992006080

申请日：1992-07-17

Applicant: ACCUWAVE CORPORATION

Inventor： ACCUWAVE CORPORATION ,  RAKULJIC, George, A. ,  YARIV, Amnon

IPC: G03H01/02

CPC classification number: H01S3/16 ,  G02B5/1857 ,  G02B5/203 ,  G02B5/32 ,  G02B6/12007 ,  G02B6/2706 ,  G02B6/29308 ,  G02B6/2931 ,  G02B6/29311 ,  G02B6/29314 ,  G02B6/29395 ,  G02B6/4215 ,  G03H1/02 ,  G03H1/0248 ,  G03H1/28 ,  G03H2001/026 ,  G03H2001/0268 ,  G03H2001/0415 ,  G03H2001/0439 ,  G03H2001/2231 ,  G03H2001/266 ,  G06K9/76 ,  G11B7/0065 ,  G11C13/044 ,  H01S3/08009 ,  H01S3/109

Abstract: A new type of holographic recording in photorefractive crystals is disclosed, termed orthogonal data storage, in which counterpropagating, reflection mode holograms are wavelength multiplexed to form gratings lying along a common axis. It is shown that this configuration provides substantial improvements in data storage capacity in comparison to prior art systems and that higher coupling coefficients are achieved. In consequence, not only storage of data but a wide range of other devices including wavelength selective filters, lenses and optical correlation systems are disclosed. Further, methods of writing and processing metastable images are disclosed which substantially improve the strength of the gratings that are permanently developed in the medium. These methods include advantageous use of electrical potentials and photovoltaic properties, together with different interrelationships during processing.

Abstract translation: 公开了一种新型的光折变晶体中的全息记录，称为正交数据存储，其中反向传播的反射模式全息图被波长多路复用以形成沿着公共轴的光栅。 显示出与现有技术系统相比，该配置提供了数据存储容量的实质性改进，并且实现了更高的耦合系数。 因此，不仅公开了数据的存储，而且公开了包括波长选择滤光器，透镜和光学相关系统在内的宽范围的其它器件。 此外，公开了写入和处理亚稳态图像的方法，其基本上改善了在介质中永久显影的光栅的强度。 这些方法包括在处理期间有利地使用电势和光伏特性以及不同的相互关系。

公开(公告)号：WO1995008206A1

公开(公告)日：1995-03-23

申请号：PCT/US1994010176

申请日：1994-09-09

Applicant: ACCUWAVE CORPORATION

Inventor： ACCUWAVE CORPORATION ,  RAKULJIC, George, Anthony ,  YARIV, Amnon ,  LEYVA, Victor ,  SAYANO, Koichi ,  TYLER, Charles, E.

IPC: H01S03/085

CPC classification number: G02B5/32 ,  H01S3/13 ,  H01S5/0687 ,  H01S5/141 ,  H01S5/4025

Abstract: A laser (11) utilizes feedback from a volume holographic (12) grating used as a wavelength standard to lock the laser output wavelength to its desired value. This feedback can be non-optical, wherein the holographic filter output is used to actively control the wavelength through an external control mechanism. This feedback can also be optical, wherein a volume hologram reflection grating is used to generate optical feedback into the laser gain.

Abstract translation: 激光器（11）利用来自用作波长标准的体全息（12）光栅的反馈来将激光输出波长锁定到其期望值。 该反馈可以是非光学的，其中全息滤光器输出用于通过外部控制机构主动地控制波长。 该反馈也可以是光学的，其中使用体积全息图反射光栅来产生对激光增益的光反馈。

公开(公告)号：WO1994014092A1

公开(公告)日：1994-06-23

申请号：PCT/US1993012242

申请日：1993-12-15

Applicant: ACCUWAVE CORPORATION

Inventor： ACCUWAVE CORPORATION ,  RAKULJIC, George, Anthony ,  LEYVA, Victor

IPC: G02B05/32

CPC classification number: G03H1/28 ,  G02B5/1857 ,  G02B5/32 ,  G03H1/02 ,  G03H1/04 ,  G03H2001/026 ,  G03H2001/0268 ,  G03H2001/0413 ,  G03H2001/2231 ,  G03H2001/2289 ,  G03H2222/16 ,  G03H2250/32 ,  G06K9/76 ,  G11B7/0065 ,  G11C13/044 ,  H01S3/06 ,  H01S3/08009 ,  H01S3/109 ,  H01S3/16

Abstract: A method of writing plane holographic gratings Bragg-matched for reflection in the infrared in a photorefractive material using shorter wavelength light through a face perpendicular to the grating planes. The writing beam wavelength is selected to be within the photorefractive sensitivity range of the crystal and the angles are chosen relative to the wavelength to define a reflection grating with a period such that counter-propagating reflection occurs at the desired IR wavelength. For reflection gratings at different wavelengths, either the transmission or the reflection mode geometry may be used. In the transmission mode, the writing beams are incident on the same side face while in the reflection made the writing is on opposite faces in an off-axis (non-counter-propagating) configuration. Anti-reflection coatings of the appropriate wavelengths are used on the crystal surfaces to reduce reflection losses and improve the diffraction efficiency of the grating.

Abstract translation: 一种写入平面全息光栅的方法，使用较短波长的光通过垂直于光栅平面的面，在光折射材料中的红外中反射布拉格匹配。 写入光束波长选择在晶体的光折射灵敏度范围内，并且相对于波长选择角度以限定具有使得在所需IR波长处发生反向传播反射的周期的反射光栅。 对于不同波长的反射光栅，可以使用透射或反射模式几何形状。 在透射模式中，写入光束入射在相同的侧面上，而在反射中使写入在离轴（非反向传播）结构中位于相对面上。 在晶体表面上使用适当波长的抗反射涂层，以减少反射损耗并提高光栅的衍射效率。