摘要:

The distribution of energetic ions implanted into an amorphous target is approximately Gaussian and can therefore be characterized by quoting a mean ⟨R⟩ and standard deviation &sgr;Rfor the range. A computer program has been written which calculates and plots ⟨R⟩ and &sgr;Ras a function of energy for any ion impinging on either a single‐ or multiple‐element substrate. Typical results for ions of interest in Si and SiO2are presented.

ISSN:0003-6951    

DOI:10.1063/1.1754768

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

Parametric amplification and side‐band oscillations have been observed using thin superconducting films at 7.2 GHz. The amplification and oscillations are associated with discontinuities in the pump power vs frequency response of the films and with slits cut into the films. When operated in a parametric mode, a net gain of 12 dB was achieved. The oscillations occur in symmetrical pairs about the pump at 1‐MHz intervals and are very sensitive to an applied dc magnetic field of approximately 0.1 G.

ISSN:0003-6951    

DOI:10.1063/1.1754769

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

An electrooptic effect with noncubic symmetry has been observed in cubic single crystals of ZnS and ZnTe. It is anomalous in that for one field polarity the result is an apparent decrease in the birefringence for small voltages rather than the expected increase. A likely explanation is the presence in our samples of a small polar strain, which is partially removed by one polarity electric field.

ISSN:0003-6951    

DOI:10.1063/1.1754770

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A hologram has been made of an object illuminated by ultrasound, using the deformation of the water surface by radiation pressure. An optical reconstruction of this sound hologram with laser light has been achieved.

ISSN:0003-6951    

DOI:10.1063/1.1754771

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

The absorption coefficients and indices of refraction of LiNbO3at 300°K have been measured with polarized radiation in the 100‐ to 1000‐&mgr; wavelength region. The ordinary ray absorption coefficient is approximately twice that for extraordinary ray radiation. Both absorption coefficients decrease significantly on cooling from 300°K to 80°K. LiNbO3shows a large far infrared birefringence and appreciable dispersion.

ISSN:0003-6951    

DOI:10.1063/1.1754772

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

We report the observation of parametric amplification of far infrared radiation in a crystal of tellurium which was pumped at 10.6 &mgr; by a CO2laser. A gain of 3 dB was measured at 17.888‐&mgr; wavelength which was obtained from a far IR neon laser. Comparison between calculated and measured values of gain show reasonable agreement.

ISSN:0003-6951    

DOI:10.1063/1.1754773

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

The expansion velocity of the luminous front of a plasma plume created by a giant pulse laser has been measured both as a function of time during the laser pulse and as a function of position in front of the pyrolitic graphite target. The initial velocity of the vapor appears to agree with the sublimation temperature of pyrolitic graphite. The subsequent vapor absorption of laser radiation produced peak final expansion velocities of 7 × 106cm/sec. The luminous front was found to accelerate from 4.8 × 105to 7.0 × 106cm/sec within a 0.3‐cm distance for a laser energy density of 700 J/cm2.

ISSN:0003-6951    

DOI:10.1063/1.1754774

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

Focused‐image holograms have been made with good results using an extended coherent source as a reference wavefront in the recording process and a different extended source in the reconstruction process. The technique is uncritical and requires no source compensation.

ISSN:0003-6951    

DOI:10.1063/1.1754775

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A model experiment simulating the interaction between the solar wind and comets is described. A plasma stream of 107cm/sec and 1013protons/cm3undergoes a collisionless interaction with a cloud of CO2gas sublimated from a piece of dry ice. Time‐resolved photographs show a well‐defined, comet‐like structure around the dry ice. An extended tail is formed by ions dragged along with the plasma stream. The ionization and acceleration processes are discussed in the light of a possible mechanism based on frozen‐in magnetic fields.

ISSN:0003-6951    

DOI:10.1063/1.1754776

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A peak has been observed in the ultrasonic attenuation in a nickel single crystal with a constant uniaxial stress and varying magnetic field. The occurrence of the peak is explained on the basis of changes in domain boundary configuration.

ISSN:0003-6951    

DOI:10.1063/1.1754777

出版商:AIP    

年代:1966

数据来源: AIP