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1.发明授权Stepped acoustic impedance-matching transformer for very narrow channel acoustic traveling wave lens waveguide 有权用于非常窄通道声波行波透镜波导的阶跃声阻抗匹配变压器公开(公告)号：US06320989B1
公开(公告)日：2001-11-20
申请号：US09235695
申请日：1999-01-22
IPC分类号： G02F1335
摘要： An acoustic impedance-matching transformer includes a tapered acoustic energy transmission (metal) block, having an acoustic impedance less than that of a piezo-electric transducer in a metric direction toward that of the acoustic propagation medium of the waveguide, and by an amount that allows tailoring of the relative spatial dimensions of mating surfaces of the transducer and the block, so as to provide efficient broadband coupling of acoustic energy. The surface area of the end face of the block engaging the transducer is a corresponding fraction of the area of the transducer. The tapered block focuses acoustic energy toward the input aperture of the waveguide channel. The taper is determined in accordance with difference between the acoustic impedance of the aluminum block and that of a second acoustic wave propagation element, such as a quarter-wave section of plexiglass, interposed between the waveguide channel and the tapered block.
摘要翻译： 声阻抗匹配变压器包括锥形声能传输（金属）块，其声学阻抗小于在波导的声传播介质的方向上的压电换能器的声阻抗， 允许调整换能器和块的配合表面的相对空间尺寸，以便提供声能的有效的宽带耦合。 接合换能器的块的端面的表面积是换能器面积的相应部分。 锥形块将声能聚焦到波导通道的输入孔径。 根据介于波导通道和锥形块之间的铝块的声阻抗与诸如有机玻璃的四分之一波长部分的第二声波传播元件的声阻抗之差来确定锥度。
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公开(公告)号：US6043924A
公开(公告)日：2000-03-28
申请号：US235696
申请日：1999-01-22
IPC分类号： G02F1/33
CPC分类号： G02F1/33
摘要： An acoustic traveling wave lens structure for an acousto-optic scanner comprises a confined height fluid-containing channel, upon which a scanned optical beam to be modulated by a acoustic traveling wave is incident. The channel is bounded by spaced-apart walls that extend between a first end of the scanner channel, to which an acoustic transducer is coupled, and a second end of the channel that terminates an acoustic traveling wave launched from the acoustic transducer. The thickness of the channel is linearly tapered from the first end to the second end, so as to maintain a constant acoustic power density. To compensate for the attenuation in acoustic power through the water medium, the waveguide may be heated, to maintain the temperature of the liquid medium (water) within the waveguide channel within a prescribed temperature range over which the acoustic velocity remains substantially constant or undergoes a relatively small variation.
摘要翻译： 用于声光扫描器的声波行波透镜结构包括限定高度的流体流通道，由声波行波调制的扫描光束入射。 通道由间隔开的壁限制，所述壁在扫描仪通道的第一端与声学换能器耦接到的第一端和通道的第二端之间延伸，该第二端终止从声换能器发射的声波。 通道的厚度从第一端到第二端呈线性渐缩，以保持恒定的声功率密度。 为了补偿通过水介质的声功率的衰减，可以加热波导，以将波导通道内的液体介质（水）的温度保持在规定的温度范围内，在该温度范围内声速保持基本上恒定或经历 相对较小的变化。
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公开(公告)号：US5801874A
公开(公告)日：1998-09-01
申请号：US668665
申请日：1996-06-25
IPC分类号： G02F1/33
CPC分类号： G02F1/33
摘要： A folded acoustic traveling wave lens arrangement imparts multiple passes of an incident optical beam through the traveling wave lens, and thereby effectively maximize utilization of acoustic power. A lens of optically transmissive bulk material, such as quartz, is disposed in the path of an incident light beam which is spatially scanned by a light beam deflector. The bulk material of the lens element has a reflective layer disposed upon at least one of its surfaces, and is configured such that an incident light beam undergoes multiple passes through the acoustic wavefront propagating through the lens, prior to emerging from the lens. Aberration in the emerging beam due to multiple passes through the bulk material is corrected by a pupil plane correction plate.
摘要翻译： 折叠的声波行波透镜装置通过行波透镜施加入射光束的多次通过，从而有效地最大化声功率的利用。 光学透射体材料（例如石英）的透镜设置在由光束偏转器空间扫描的入射光束的路径中。 透镜元件的体材料具有设置在其至少一个表面上的反射层，并且被构造为使得入射光束在从透镜出射之前经过传播通过透镜的声波波面经过多次通过。 通过瞳孔平面校正板校正由多次通过大块材料引起的出射光束中的偏振。
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公开(公告)号：US6052215A
公开(公告)日：2000-04-18
申请号：US235697
申请日：1999-01-22
CPC分类号： G02F1/33
摘要： A solid state acoustic travelling wave lens comprises a thin core layer of acoustic and light transmissive material, such as crystalline quartz, compression-bonded between a pair of outer or cladding layers, such as fused silica, having an acoustic velocity that is only slightly higher than (e.g., less than five percent of) that of the core material. The acoustic mode field characteristic of the weakly guiding device contains no spatial variations caused by Fresnel diffraction in an unguided wave device. In a second embodiment, shear stress coupling between the core and cladding layers is inhibited by interposing very thin liquid boundary layers between the core layer and the cladding layers. Such thin liquid boundary layers, which are relatively more compressible than the core and cladding material, allow longitudinal waves to be transmitted across the core/cladding boundary (through the liquid), but prevent transmission of shear waves therebetween.
摘要翻译： 固体声波行波透镜包括声光透射材料的薄芯层，例如结晶石英，压缩在一对外层或覆层之间，例如熔融二氧化硅，其声速仅略高 （例如，不到5％）的核心材料。 弱引导装置的声模场特性不包含非导波装置中由菲涅耳衍射引起的空间变化。 在第二实施例中，通过在芯层和包覆层之间插入非常薄的液体边界层来抑制芯和包层之间的剪切应力耦合。 这种比芯和包层材料相对更可压缩的薄的液体边界层允许纵向波纹穿过芯/包层边界（通过液体）传输，但是防止它们之间的剪切波传播。
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公开(公告)号：US06870658B2
公开(公告)日：2005-03-22
申请号：US10462552
申请日：2003-06-16
CPC分类号： H03F1/30 , G02F1/0121 , G02F1/113 , H03F1/02 , H03F2200/105
摘要： An RF power controller arrangement prevents excessive RF power-based thermal loading of an RF signal processing device, such an as acousto-optic modulator, by controllably constraining the product of the average on-duration of a baseband modulation signal and RF input power to realize no more than a prescribed value of RF energy supplied to the modulator.
摘要翻译： RF功率控制器布置通过可控地约束基带调制信号的平均接通时间和RF输入功率的乘积来防止RF信号处理设备（例如声光调制器）的过多的基于RF功率的热负载，以实现 不超过提供给调制器的规定值的RF能量。
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6.发明授权Stepped acoustic impedance-matching transformer for very narrow channel acoustic traveling wave lens waveguide 有权用于非常窄通道声波行波透镜波导的阶跃声阻抗匹配变压器公开(公告)号：US06487324B2
公开(公告)日：2002-11-26
申请号：US09896167
申请日：2001-06-29
IPC分类号： G02F1335
摘要： An acoustic impedance-matching transformer includes a tapered acoustic energy transmission (metal) block, having an acoustic impedance less than that of a piezo-electric transducer in a metric direction toward that of the acoustic propagation medium of the waveguide, and by an amount that allows tailoring of the relative spatial dimensions of mating surfaces of the transducer and the block, so as to provide efficient broadband coupling of acoustic energy. The surface area of the end face of the block engaging the transducer is a corresponding fraction of the area of the transducer. The tapered block focuses acoustic energy toward the input aperture of the waveguide channel. The taper is determined in accordance with difference between the acoustic impedance of the aluminum block and that of a second acoustic wave propagation element, such as a quarter-wave section of plexiglass, interposed between the waveguide channel and the tapered block.
摘要翻译： 声阻抗匹配变压器包括锥形声能传输（金属）块，其声学阻抗小于在波导的声传播介质的方向上的压电换能器的声阻抗， 允许调整换能器和块的配合表面的相对空间尺寸，以便提供声能的有效的宽带耦合。 接合换能器的块的端面的表面积是换能器面积的相应部分。 锥形块将声能聚焦到波导通道的输入孔径。 根据介于波导通道和锥形块之间的铝块的声阻抗与诸如有机玻璃的四分之一波长部分的第二声波传播元件的声阻抗之差来确定锥度。
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7.发明授权
公开(公告)号：US4939387A
公开(公告)日：1990-07-03
申请号：US190658
申请日：1988-05-05
申请人： Marc H. Popek , Pat O. Bentley
发明人： Marc H. Popek , Pat O. Bentley
摘要： An amplitude modulation apparatus for achieving an extremely deep extinction ratio (in excess of -90 dBc) at nanosecond rise times required by an SAW device comprises the cascaded combination of a controlled switching device (GaAsFET), capable of providing a medium degree (40 dB) of attenuation at nanosecond switching rates, and a double balanced mixer, both multiplier input ports of which are coupled to receive split outputs from the GaAsFET switch. Because of the nonlinearity of the transfer function of the mixer when driven by the same RF carrier input at both multiplier ports, the output of the mixer is in excess of -90 dBc. In an SAW-based signal processing system, the output of the mixer is coupled to RF drive input of the SAW device. With the throughput functionality of the GaAsFET switch being precisely controlled to supply an integral number of half RF carrier frequency cycles to the double balanced mixer, the resultant waveform that is applied to the SAW device drive input from the mixer contains no energy at the RF carrier that could otherwise introduce unwanted Fresnel distortion.
摘要翻译： 用于在SAW器件所需的纳秒上升时间达到极高消光比（超过-90dBc）的幅度调制装置包括能够提供中等程度（40dB）的受控开关器件（GaAsFET）的级联组合 ）和双平衡混频器，其两个乘法器输入端口被耦合以接收来自GaAsFET开关的分离输出。 由于在两个乘法器端口由相同RF载波输入驱动时混频器的传递函数的非线性，混频器的输出超过-90 dBc。 在基于SAW的信号处理系统中，混频器的输出耦合到SAW器件的RF驱动输入端。 随着GaAsFET开关的吞吐量功能被精确控制，向双平衡混频器提供整体数量的半RF载波频率周期，施加到来自混频器的SAW器件驱动输入的合成波形在RF载波上不含能量 否则会引起不必要的菲涅尔失真。
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8.发明授权公开(公告)号：US06765709B1
公开(公告)日：2004-07-20
申请号：US10424660
申请日：2003-04-28
IPC分类号： G02F111
CPC分类号： G02F1/113 , G02F1/0147 , G02F2201/124 , G02F2203/21 , G02F2203/60
摘要： A multi-channel acousto-optic modulator contains an integrated structure for providing active compensation for transient thermal effects. A plurality of electro-thermal elements in the form of resistive strips are interleaved with acoustic wave launching transducers, to which signals are applied for modulating respective acoustic waves launched into an acousto-optic medium. The resistive strips receive electrical signals that controllably introduce respective thermal energy components into the acousto-optic medium adjacent to the signal launch transducers, in a manner that causes the overall spatial distribution of thermal energy in the acousto-optic medium to have a prescribed characteristic. By establishing an thermal gradient characteristic across all the channels of the RF signal processor, and compensating each channel on an individual basis, the invention effectively compensates for time-dependent variations in heating, resulting in a substantially level thermal behavior.
摘要翻译： 多声道声光调制器包含用于提供瞬态热效应的有源补偿的集成结构。 电阻条形式的多个电热元件与声波发射换能器交错，信号被施加到声波发射换能器，用于调制发射到声光介质中的各个声波。 电阻条接收电信号，其可以以使得声光介质中的热能的总体空间分布具有规定特性的方式可控地将相应的热能分量引入与信号发射换能器相邻的声光介质中。 通过在RF信号处理器的所有通道上建立热梯度特性，并且在各个基础上补偿每个通道，本发明有效地补偿了加热时间上的变化，导致基本上水平的热行为。
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