摘要:

Epitaxial twinned single‐crystal films of copper have been grown on sapphire substrates by high vacuum evaporation in the temperature range 240–‐375°C. The presence of a twin relationship in copper deposited on the basal plane of sapphire was demonstrated and evaluated by x‐ray diffraction techniques. The epitaxy has been shown to be (111)Cu∥ (0001)&agr;−Al2O3; [21¯1¯)Cu∥ [21¯1¯0]&agr;−Al2O3. The films have been found to exhibit the bulk metal resistivity.

ISSN:0003-6951    

DOI:10.1063/1.1651935

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Electron tunneling into amorphous germanium films was studied using Al&sngbnd;Al2O3&sngbnd;Ge tunnel junctions. A ``conductance well'' was observed, which is related to the band edges of the amorphous germanium film and its surface potential. Structure in the conductance well is interpreted as tunneling into gap states. The results suggest tunneling as a possible tool for the study of band structure in amorphous materials.

ISSN:0003-6951    

DOI:10.1063/1.1651936

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Numerical solutions of the nonlinear wave equation show that the steady‐state self‐trapping of optical beams in molecular fluids exhibits new characteristics when the intensity‐dependent index (orientational Kerr effect) begins to saturate. The power dependence of the beam diameter and the radial electric field distribution are examined. Beam diameters less than the wavelength of light are predicted for CS2in the saturation regime.

ISSN:0003-6951    

DOI:10.1063/1.1651937

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

It is suggested that a main part of the water‐vapor laser spectrum consists of transitions in the interacting 2v2,v3, andv1states of H2O. The considered transitions are essentially of a pure rotation nature. Tentative assignments are made for 19 of the previously known laser lines.

ISSN:0003-6951    

DOI:10.1063/1.1651938

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Twenty five laser lines in water vapor are identified as transitions between known vibration‐rotation levels. The mechanism is discussed: The initiating factor is a weak perturbation involving close resonance between levels of the bending overtone and the stretching fundamentals. Three resonances account for most of the strongest lines: 020, 550↔ 100, 514, at 4050 cm−1, 020, 661↔ 001, 633, at 4408 cm−1, and 020, 844↔ 100, 808at 4387 cm−1above the zero level. The 2527952.8 MHz line is assigned to 001, 642→ 020, 661.

ISSN:0003-6951    

DOI:10.1063/1.1651939

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Measurements of |&Dgr;J|, effective magnetic moments, and natural linewidths were made for most of the CW lines in H2O and D2O lasers. Using these results, previous results on couplings between the various CW lines, and published experimental data on the energy levels of H2O, identifications have been proposed for most of the CW lines as vibrational‐rotational and pure rotational transitions in theJ= 5 andJ= 6 levels of the (100), (020), and (001) vibrational states of H2O.

ISSN:0003-6951    

DOI:10.1063/1.1651940

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A technique is described which reduces the bandwidth required for holographic data transmission by eliminating vertical parallax. This is accomplished by transmitting only the information in a thin horizontal strip of a conventional hologram. The receiver is required to reproduce many identical copies of this strip hologram, and present them simultaneously in a vertical array for viewing. Horizontal parallax and a panoramic three‐dimensional view are preserved. Experimental results of feasibility tests are described.

ISSN:0003-6951    

DOI:10.1063/1.1651941

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The behavior of a passively switched laser is described by a set of partial differential equations, which are integrated numerically. For short upper‐state lifetimes of the absorbing medium, the calculated output of the laser is a train of narrow pulses. Pulses occur either singly or in multiples during the roundtrip time 2L/c, depending on whether the absorber is near one mirror or at an intermediate position.

ISSN:0003-6951    

DOI:10.1063/1.1651942

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Continuously variable time compression, expansion, and inversion, with the corresponding changes in frequency, of rf signals in the range of 10 to 100 MHz, are described. By using a simple optical heterodyning technique and high‐speed scanning of a laser beam, an rf signal, ``stored'' as an acoustic signal in a quartz bar, can be processed or ``read out'' in a variety of ways. Although present equipment has limited the amount of processing and frequency range of the signals that can be handled, it is felt that input signal frequencies are restricted only by the acoustic properties of the delay medium and the output frequencies will be limited by the response of the photodetector.

ISSN:0003-6951    

DOI:10.1063/1.1651943

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Xenon gas has been compressively heated to temperatures of from 8000 to 15,000°K in a ballistic compressor system. Brightness measurements of the light pulses produced indicate blackbody radiation at these temperatures. The radiation has been coupled into a neodymium‐doped glass laser rod with resulting laser action. The system affords a direct transfer of mechanical energy into pumping radiation without the necessity of intermediate energy storage devices.

ISSN:0003-6951    

DOI:10.1063/1.1651944

出版商:AIP    

年代:1968

数据来源: AIP