摘要:

Low‐temperature conductance peaks have been observed in tunneling measurements on aluminum‐phosphosilicate glass‐degenerate silicon sandwich structures. In magnetic fields up to 84 kOe these peaks split and, with certain assumptions, thegvalue for the impurity responsible for the peak is found to be 2.1 ± 0.1.

ISSN:0003-6951    

DOI:10.1063/1.1652579

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Single‐crystal lithium niobate has been used as a holographic storage medium. The material undergoes a change in refractive indices upon exposure to suitably intense light thus allowing it to act as a pure‐phase, volume‐holographic medium requiring no processing. The holograms formed have high diffraction efficiencies and are thermally erasable. The high resolution obtained suggests that such material may be useful in high‐capacity, changeable optical information storage, processing and display devices.

ISSN:0003-6951    

DOI:10.1063/1.1652580

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The calculation of filament diameter is based on the wave equation involving field‐dependent electric permittivity for light frequencies expanded up to sixth power of electric field vector. With reasonable assumptions a diameter of 4–6 &mgr; has been obtained. For increasing power fed into the beam two or more filaments may be formed simultaneously. It is believed that there exist relaxation processes inside the filament somewhat diminishing nonlinear terms of electric permittivity. Thus, the solution of the wave equation becomes divergent resulting in filament vanishing. As a result, new filaments occur sequentially, forming an apparent light channel.

ISSN:0003-6951    

DOI:10.1063/1.1652581

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Capacitance measurements have been used to distinguish between the effective field and ionic avalanche models for the autocatalytic buildup of ionic current on applying a constant high field to tantalum pentoxide films.

ISSN:0003-6951    

DOI:10.1063/1.1652582

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Asingle pulsewas selected from the train of mode‐locked pulses of a Nd‐glass laser using optics external to the oscillator cavity. Its pulse width was measured by the two‐photon fluorescence technique to be 10 to 15 psec with and without amplification. From energy measurements, the amplified single‐pulse power was determined to be typically 30 GW.

ISSN:0003-6951    

DOI:10.1063/1.1652583

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Emission of electrons into vacuum from a forward‐biased Schottky barrier has been demonstrated experimentally. The emitting contact is a thin layer of platinum onn‐type conducting ZnS with the outer surface of the platinum cesiated to reduce its work function. Capacitance and photoemission measurements indicate that the ZnS:Pt barrier height is 2.3 eV. Under forward‐bias emission is observed.

ISSN:0003-6951    

DOI:10.1063/1.1652584

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

An experiment is described where a cw HCN laser working primarily at 337‐&mgr;m wavelength was used as the source of a Mach‐Zehnder interferometer for the study of plasma decay in the electron number density region 5 · 1015>ne> 5 · 1013cm−3. It was found that an estimate of the electron temperature in the range 103−104°K could also be made from the amplitude of the interferometer fringes.

ISSN:0003-6951    

DOI:10.1063/1.1652585

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

By using a discharge tube filled with pure neon as a nonlinear element, it has been found possible to obtain simultaneous locking of both longitudinal and transverse modes of a 6328 Å He&sngbnd;Ne laser. Under certain circumstances, each transverse mode has all its longitudinal resonances phase locked to form a narrow pulse, but the pulses corresponding to the various transverse mode orders do not coincide in time. Beam scanning has been observed when the frequency spacing between the transverse modes is a simple fraction of the longitudinal mode spacing. Under these conditions, a ``spot'' of light traces out a zig‐zag path in the laser cavity.

ISSN:0003-6951    

DOI:10.1063/1.1652586

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Evidence is given that the reported prompt emission of electrons from the rear side ofQ‐switched laser‐illuminated metal foils does not occur. The effect has been eliminated by careful light shielding of the electron collector.

ISSN:0003-6951    

DOI:10.1063/1.1652587

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Experiments on the sodiumDlines and an 0.82‐Å separated doublet in the iron spectrum have shown that holographically recorded dichromated gelatin diffraction gratings have resolving powers within 90% of theory. The diffraction gratings are of excellent optical quality, have background scatter less than 10−4of the signal, are ghost free and have greater than 90% first‐order diffraction efficiency. Blazing is accomplished by rotating the grating to the incident angle which satisfies the Bragg condition for the blaze wavelength. The 3‐&mgr;‐thick transmission gratings can be employed from 0.25 &mgr; to at least 15 &mgr;, with gelatin absorption interfering only at 2.6–4.0 &mgr; and 5.8–8.5 &mgr;.

ISSN:0003-6951    

DOI:10.1063/1.1652590

出版商:AIP    

年代:1968

数据来源: AIP