摘要:

A monolithic zinc‐oxide–on–siliconp‐nstorage correlator has been constructed. When operated both as a convolver and as a storage correlator, the electronic efficiency obtained with this device is comparable to that of the present LiNbO3airgap devices. This device has the potential of having very large dynamic range because of the absence of spurious bulk‐wave generation, as occurs in the airgap device. Several signal‐processing functions have been demonstrated with this new type of storage correlator. In one chirp correlation experiment, correlation of signals with a time‐bandwith product of 4000 has been observed.

ISSN:0003-6951    

DOI:10.1063/1.89507

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The operation and construction of a new actively controlled SAW power divider is presented. The amount of power delivered to either of two outputs can be controlled with a voltage less than +30 V. The two essential components of this device are a SAW magic tee fabricated onyzLiNbO3and an acoustoelectric phase shifter which uses silicon air‐gap coupled to the LiNbO3.

ISSN:0003-6951    

DOI:10.1063/1.89508

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Measurements have been made of the energy spectrum of neutrons emitted as a result of laser compression of D‐T‐filled glass microshells using a time‐of‐flight spectrometer. From the width of unfolded energy spectra, plasma ion temperatures of approximately 6 keV have been determined for 90‐&mgr;m‐diam targets irradiated with 2 TW of 1.06‐&mgr;m light. The measured mean neutron energy of 14.00±0.10 MeV agrees with the expected value of 14.05 MeV.

ISSN:0003-6951    

DOI:10.1063/1.89509

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Measurements of the attenuation in a background gas, He or N2, of the uv radiation produced by a 1.7‐ns 4‐J CO2laser irradiation of a copper target are reported. Photoionization cross sections of 0.4 Mb in He and 0.9 Mb in N2are obtained. The photoionizing radiation is attributed to the 110.6‐A˚M1transition in copper.

ISSN:0003-6951    

DOI:10.1063/1.89510

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The integral equation for ion‐implantation range, damage, and ionization distributions in random media is generalized to allow nonuniform target materials. The generalization range equation is solved in the path‐length approximation, using power‐law cross sections, for a target consisting of two dissimilar half‐spaces. There is a discontinuity in the distribution at the interface, proportional to the value of the distribution in the material the projectile is leaving; the constant of proportionality is evaluated explicitly.

ISSN:0003-6951    

DOI:10.1063/1.89511

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The concentrations of donors (ND) and acceptors (NA) in a high‐quality GaAs epitaxial layer sample are determined by the optical method. The numerical values ofNDandNAare deduced from the limiting values of combinations of the excitation‐dependent integrated emission intensities due to the conduction‐band–to–neutral‐acceptor, neutral‐donor–to–valence‐band, and neutral‐donor–to–neutral‐acceptor transitions.

ISSN:0003-6951    

DOI:10.1063/1.89512

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Our findings indicate that the frost‐formation phenomenon common to many photoconductor‐thermoplastic devices can be attributed to spinodal decomposition processes. This decomposition is induced by the inherent electrical field of about 106V/cm in the plasticized and polydispersed thermoplastic melts. By using monocomponent polystyrene of sharply defined molecular weight distribution for the thermoplastic layer the frost formation is suppressed, so that holograms having high signal‐to‐noise ratio can be readily recorded.

ISSN:0003-6951    

DOI:10.1063/1.89513

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Picosecond pulses continuously tunable from 685 to over 900 nm have been obtained from a dye laser synchronously pumped by a mode‐locked krypton laser. The pulse duration was measured by autocorrelation techniques to be as short as 25 ps. Conversion efficiency up to 30% and average power in excess of 400 mW were observed. Continuous‐wave laser operation for three new dyes between 870 and 985 nm is also reported.

ISSN:0003-6951    

DOI:10.1063/1.89492

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Oscillation at 172 nm for 200 nsec has been observed at a pressure of 1.5 atm of xenon with a 1‐m length of gain medium pumped by a 200‐kV 7‐A/cm21‐&mgr;sec electron beam. The observed behavior agrees with calculations based on the excited‐state mixing model for this new operating regime. The results support model predictions that a modest increase in excitation rate (about a factor of 2) would yield quasi‐steady‐state laser oscillation with an intrinsic efficiency near 5%, a fluence of ∼1 J/cm2, and a peak intracavity two‐way flux of ∼50 MW/cm2. In optimized laser amplifier designs, significantly higher amplifier efficiencies should be possible.

ISSN:0003-6951    

DOI:10.1063/1.89493

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

A technique is described to couple and synchronize two transversely excited atmospheric (TEA) nitrogen lasers in an oscillator‐amplifier configuration to obtain spatially coherent 1‐nsec pulses at 337 nm with an energy/pulse of several hundred microjoules. The technique should be adaptable to other very high gain laser systems whose operation terminates so quickly as to render optical resonators impractical.

ISSN:0003-6951    

DOI:10.1063/1.89494

出版商:AIP    

年代:1977

数据来源: AIP