摘要:

A new type of transparent heat mirror for solar‐energy applications has been fabricated by chemically etching a Sn‐doped In2O3film to form a transparent conducting microgrid. For square openings 2.5 &mgr;m on a side, separated by lines 0.6 &mgr;m wide, the solar transmission increases from 0.8 for the original continuous film to 0.9 for the microgrid. Although 65% of the area of the film is removed by etching, the infrared reflectivity decreases by only 9%, from 0.91 to 0.83. A smaller decrease in the infrared reflectivity may be possible if materials with higher optical conductivity are used.

ISSN:0003-6951    

DOI:10.1063/1.88790

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Analysis of the transient depletion of a 10.6‐&mgr;m laser beam inn‐InSb at 2 K observed by Figueira, Cantrell, Rink, and Forman shows that the observed depletion is not due to causes such as lattice heating, depletion by other nonlinear processes, or optical damage. Simple estimates are presented which show that a 10.6‐&mgr;m laser pulse of the intensity and duration of that used by Figueiraetal. will heat the conduction electrons very strongly, leading to a transient increase in carrier concentration and conductivity, and a corresponding increase in optical absorption.

ISSN:0003-6951    

DOI:10.1063/1.88791

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Laser action has been observed from the chemical reaction of fluorine injected into supersonic flows of boron and aluminum atoms. The laser output in the 12.8–20‐&mgr;m region (AlF) is temporally different from that in the 6.1–13‐&mgr;m region (BF), but both have pulse durations 103–104longer than any of the previously reported metal atom oxidation lasers.

ISSN:0003-6951    

DOI:10.1063/1.88792

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A modified Penning trap has been developed and shown to yield 100 times narrower axial resonance linewidths on electrons than that of a previous unmodified Penning trap. An extra pair of electrodes is inserted in the standard trap configuration, which effectively nulls the quartic term in the trapping potential. With existing signal‐to‐noise limitations, an axial frequency resolution of 0.02 ppm can be obtained. This device is particularly attractive to high‐resolution mass spectrometry.

ISSN:0003-6951    

DOI:10.1063/1.88793

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

In magnesium, bound‐continuum matrix elements contribute constructively to the magnitude of the third‐order nonlinear susceptibility &khgr;(3&ohgr;)(3)for sum‐frequency mixing in the region of the first continuum. Thus, continuously tunable harmonic radiation in the region 140–160 nm (9000 cm−1) can be readily obtained with two dye lasers of modest power. The onset of saturation in the vacuum ultraviolent intensity at 1436 nm was not observed until incident powers ⩾30 kW, where the measured power conversion efficiency was 0.2%.

ISSN:0003-6951    

DOI:10.1063/1.88794

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

We calculate the Fourier transform of the electric field at a point on the image of an object as the angle or wavelength of the illumination on the object is varied and show that this function provides a direct measurement of the amplitude and surface height structure of the object within the resolution cell centered at the corresponding point on the object.

ISSN:0003-6951    

DOI:10.1063/1.88795

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

We report the firstp‐njunction delineation and diffusion study in a ternary chalcopyrite‐type semiconductor.p‐njunctions were formed in Zn‐ or Cd‐platedp‐CuInSe2by 5‐min anneals at 200–450 °C. By means of angle lapping and staining techniques, junction depthsxjvarying from ∼1 &mgr;m to ∼130 &mgr;m were determined. These measurements yield the relationship lnxj(&mgr;m) =14.31−6900/T(K). The interdiffusion coefficient derived fromxjisD(cm2/sec) =164 exp[−1.19 (eV)/kT]. The large preexponential term indicates concentrations or mobilities of point defects substantially above those of the related II‐VI compounds.

ISSN:0003-6951    

DOI:10.1063/1.88796

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Low‐loss AlxGa1−xAs waveguides withx=0.1 andx=0.25 have been fabricated by molecular beam epitaxy. Losses are determined for bothn‐ andp‐type waveguides using a combination of Raman scattering and transmission measurements. These waveguides have optical losses ⩽1.5 cm−1between 1.1 and 1.4 eV, the energy of the GaAs double heterostructure laser, and are comparable to similar waveguide structures grown by liquid phase epitaxy.

ISSN:0003-6951    

DOI:10.1063/1.88797

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The drift velocity–electric field relationship for the ternary alloy InAs1−xPxhas been studied by the Monte Carlo methd. Random potential alloy scattering has been included in the calculations, along with polar optical scattering, intervalley scattering, acoustic scattering, piezoelectric scattering, and ionized impurity scattering. The low‐field electron mobility has also been calculated throughout the compositional range for the alloy.

ISSN:0003-6951    

DOI:10.1063/1.88798

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Exact analytical expressions are obtained for the elementary first‐order (&Dgr;V) interaction force between a dislocation loop and flux line lattice in a type‐II superconductor, using the stress field of the flux line lattice. The interaction force initially increases as the square of loop radiusR, but asRis increased further it has the periodicity of a Bessel function of first order, i.e.,J1.

ISSN:0003-6951    

DOI:10.1063/1.88799

出版商:AIP    

年代:1976

数据来源: AIP