摘要:

A new alternative to the nonlinear delay line convolver is presented, one which has the special advantage of being able to correlate millisecond signals without time inversion. An experimental verification achieved with a simple device is described and the possible use of a more complete system is explained.

ISSN:0003-6951    

DOI:10.1063/1.88272

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The nonlinear interaction between two oppositely directed surface acoustic waves (SAW) is analyzed. It is shown that the surface boundary conditions lead to the generation of up to three bulk waves at the sum frequency of the two input waves. The interaction is characterized by two frequency‐independent parameters which are related to the total surface displacement at the sum frequency and the strength of the bulk waves generated. These parameters are calculated for a number of materials of technological interest.

ISSN:0003-6951    

DOI:10.1063/1.88259

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The use of remotely launched acoustic surface waves to scan image information on a zinc‐oxide–on–silicon monolithic geometry is demonstrated. The dynamic range for the readout can be greatly enhanced by using pulsed bias signals which invert the surface of then‐on‐n+silicon substrate. Images may also be stored in the form of trapped charge replicas in the zinc oxide, and subsequently they may be nondestructively read out using the scanning surface waves.

ISSN:0003-6951    

DOI:10.1063/1.88265

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Thin films of Ti, Ni, and Cr have been diffused into LiNbO3to form regions of increased acoustic surface wave velocity. Velocity changes as large as 1.4% have been observed. Diffused strips of Ti have been found suitable for fabricating efficient grating reflectors.

ISSN:0003-6951    

DOI:10.1063/1.88266

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The fraction of light backscattered from plasmas produced by 10.6‐&mgr;m laser light focused on polyethylene slab targets is ∼5% of the incident for intensities between 1013and 1015W/cm2. Time‐integrated measurements of the spectrum of backscattered light near 10.6 &mgr;m are presented.

ISSN:0003-6951    

DOI:10.1063/1.88267

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The identification of the negative ion species created in a low‐pressure CO2‐N2‐He electric discharge has been accomplished using an on‐line quadrupole mass spectrometer. In a slow‐flow 1‐Torr cylindrical (22‐mm‐i.d.) discharge plasma, the prominent negative ions are NO−2, NO−3, O−2, O−, and CO−3. The changes in relative composition are presented for the current range 0.2–60 mA.

ISSN:0003-6951    

DOI:10.1063/1.88268

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A high‐pressure glow discharge in flowing gases is described. The cathode surface and the discharge glow are isolated by a mica sheet with a matrix of holes drilled into it. The cathode is differentially pumped to a pressure of approximately 1 Torr. This electrode structure has produced a discharge power density of 15 W/cm3when the gas residence time is 3 ms.

ISSN:0003-6951    

DOI:10.1063/1.88269

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Radioactive72Ga+ions have been implanted at room temperature into misoriented silicon crystals to a low fluence of 1013ions/cm2. The resulting depth distribution, measured by anodic stripping, shows a prominent penetrating tail. Previously, such tails have been observed only in high‐temperature bombardments and have therefore been attributed to an enhanced diffusion mechanism. It is shown that the scattering of ions into inclined planar or axial channels can account for all the Ga distributions observed. Some consequences for Si device fabrication are discussed.

ISSN:0003-6951    

DOI:10.1063/1.88270

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

An almost single‐mode waveguiding layer has been fabricated by thermal diffusion of TiO2into LiNbO3. The refractive‐index change in the layer is 2–3×10−3for bothneandno, and the propagation loss is 0.7–0.8 dB/cm. The electro‐optic coefficients are found to be nearly equal to those of the bulk crystal. An amplitude modulation has been made with a stripe waveguide 10 &mgr;m wide and planar electrodes. The half‐wave voltage is 17 V and the maximum extinction ratio is 12 dB.

ISSN:0003-6951    

DOI:10.1063/1.88271

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Population inversion by adiabatic rapid passage (ARP) utilizing narrow saturation resonances is observed for an infrared transition of NH3. The population change produced by sweeping the frequency of a strong saturating laser field through the center of a Doppler‐broadened absorption line is probed by a weak counterpropagating field as in a Lamb‐dip experiment. When the ARP conditions are satisfied, inversion of population is detected as amplification of the probe wave near the line center.

ISSN:0003-6951    

DOI:10.1063/1.88273

出版商:AIP    

年代:1975

数据来源: AIP