摘要:

A copper vapor laser, utilizing a pulsed discharge transverse to a supersonic flow of copper vapor, argon, and helium and oscillating at 5106 and 5782 Å, has been built and tested. Laser energy densities per pulse of 2.5 &mgr;J cm−3have been achieved to date. Laser pulse widths of up to 185 nsec have been obtained with delay times after initiation of the current pulse of 220–250 nsec. Both the delay time and pulse width are in good agreement with theoretical predictions. Quenching of the laser pulse is shown to be due to a rapid increase in the rate of equilibration of the lasing levels by electron collisions, and to a decrease in the differential pumping of the lasing levels from the ground state because of a decay in the electron temperature.

ISSN:0003-6951    

DOI:10.1063/1.1654258

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Yellow‐orange luminescence peaking at 5900 Å was obtained from the aluminum‐doped ZnSe diode. The external quantum efficiency of 0.1% has been attained at 300 °K. Brightness levels of 200 fL have been measured at an input power of 100 mW.

ISSN:0003-6951    

DOI:10.1063/1.1654259

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

In a uniaxial crystal, walk‐off or double refraction occurs only in the plane of the direction of propagation and the optic axis. By elliptical focusing of the signal, idler, and pump we can focus much more tightly in the non‐walk‐off plane and increase parametric gain considerably. Optimum focusing conditions are obtained, and in a typical LiNbO3oscillator pumped with 1.06 &mgr; we find that threshold can be lowered more than a factor of 5.

ISSN:0003-6951    

DOI:10.1063/1.1654260

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Selected‐area analysis by Auger electron spectroscopy requires a knowledge of electron‐beam location and the ability to place the beam on specified areas quickly and reproducibly. For samples with both conducting and insulating regions, it is highly desirable to use a grazing‐angle‐of‐incidence electron beam to reduce surface‐charging effects. Unfortunately, the use of grazing incidence makes the location of the area of interest and simultaneous optimization of the Auger signal rather difficult because of a parallax problem. Superposition of sample current images and secondary‐electron images produced by scanning the electron beam from the grazing‐incidence gun provides a solution to these alignment problems.

ISSN:0003-6951    

DOI:10.1063/1.1654261

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

We have developed a theory to solve for the lowest‐order mode of hollow dielectric laser resonators with external mirrors. The results agree well with previously reported experimental results. In general, the optimum position (or positions) for a mirror of fixed curvature can be calculated, but as yet no simple rule has been found for predicting these positions.

ISSN:0003-6951    

DOI:10.1063/1.1654262

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Studies of the resistivity and Hall effect inn‐type (221) Si/(112¯2) Al2O3films have shown that the electron mobility is a strong function of azimuthal direction in the plane of the film. Typical variations in mobility between high‐ and low‐mobility directions are approximately 40%. The anisotropy in mobility is explained on the basis of piezoresistance effects in Si, due to stresses induced by the differential thermal contraction between the Si and the Al2O3substrate.

ISSN:0003-6951    

DOI:10.1063/1.1654263

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Epitaxial films of gadolinium‐gallium‐substituted yttrium iron garnet (Gd : Ga : YIG) films have been grown by rf‐sputtering techniques on ⟨111⟩ gadolinium gallium garnet (GGG) substrates. The as‐deposited films were annealed to yield crack‐free epitaxial garnets, which exhibited movable magnetic (bubble) domains. Typical magnetic data for the sputtered Gd : Ga : YIG films are presented.

ISSN:0003-6951    

DOI:10.1063/1.1654264

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Low‐loss waveguides for integrated optical devices are formed by electrically induced migration of ions in glass plates. The guiding region is located beneath the substrate glass. The transmission loss of the waveguides is estimated to be less than 0.1 dB/cm.

ISSN:0003-6951    

DOI:10.1063/1.1654265

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

An investigation was made of the influence of an electric field on the transmission of a multilayered structure consisting of CdS and glass films. The same shift of the fundamental absorption edge was observed with the application of an electric field of 10–50 V to the sample as for a single crystal with a high applied voltage of about 1000 V. We also obtained a large‐modulation degree at longer wavelengths of 0.55–1.4 &mgr; than at the wavelength of the fundamental absorption edge of CdS and obtained light‐intensity modulation of the He&sngbnd;Ne laser at 6328 Å.

ISSN:0003-6951    

DOI:10.1063/1.1654266

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A channeltron electron multiplier array has been used to detect exoelectron emission during the the fatigue cycling of aluminum. This provides the first two‐dimensional visual display of the onset and development of fatigue damage. Exoelectron emission is detected in less than 0.1% of the fatigue life and increases in intensity with continued fatigue cycling; final failure occurs in the region of most intense emission.

ISSN:0003-6951    

DOI:10.1063/1.1654267

出版商:AIP    

年代:1972

数据来源: AIP