摘要:

The effect of laser action, in CO2laser plasmas, on the spontaneous emission in the visible spectral region is studied by means of a phase‐lock technique. The results reveal that direct collisions between molecules in the primary laser cycle and highly excited states have an important influence on the properties of the plasma.

ISSN:0003-6951    

DOI:10.1063/1.1754927

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

The use of nonlinear effects in image processing is discussed, particularly in connection with holography. A new type of microscope, called a holoscope, is described which permits true three‐dimensional magnification.

ISSN:0003-6951    

DOI:10.1063/1.1754928

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Using departure from stoichiometry for doping,p‐njunctions were prepared from CdxHg1−xTe alloys with 0.15 <x≤ 0.28, and their current‐voltage characteristics were measured at 77°K. The spectral study of these photovoltaic detectors operating at 77°K showed responses from 3 &mgr; up to 17.5 &mgr;. Detectivity measurements at the wavelengths of maximum response of these detectors yielded values at 77°K between 1 and 5 × 109cm‐W−1‐Hz1/2in the range 3 to 14 &mgr;. The speed of these detectors was measured to be <50 nsec, which was also confirmed by the observation of mode beats on the continuous output of a low‐power CO2laser at several frequencies up to 25 MHz.

ISSN:0003-6951    

DOI:10.1063/1.1754929

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

The emission spectrum ofn‐type InSb axially mounted in cylindrical waveguide in both transverse and longitudinal magnetic fields has been studied. The radiation spectrum observed using this new configuration has been found to extend to 102 GHz and to exhibit more uniform spectral characteristics than previously reported. The emission from this axial configuration in a longitudinal magnetic field was unique in that part of the radiation occurred after the electric field pulse had concluded.

ISSN:0003-6951    

DOI:10.1063/1.1754930

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

An iron phosphor composed mainly of alumina and lithia was prepared with enriched iron‐57. The Mo¨ssbauer spectrum showed magnetic hyperfine structure at room temperature and above, indicating a remarkably long relaxation time. Such structure, if observable, usually requires temperatures near 4°K. A tentative assignment of the most intense lines could be made; this was facilitated by the application of an external transverse magnetic field which increased the contribution of the sextet due to atomic spin 3/2, relative to that due to spin 5/2.

ISSN:0003-6951    

DOI:10.1063/1.1754931

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Suitably prepared samples of rare‐earth‐doped CdF2are found to be good photodetectors from the far infrared (20 &mgr;) well into the visible. Preliminary measurements ofD*are of the order of 4 × 109cm (cps)1/2W−1with a response time of the order of 10−6sec. This represents the first attempt to use an ionic crystal as a far‐infrared photoconductor.

ISSN:0003-6951    

DOI:10.1063/1.1754932

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Experimental observations on FEPE from large‐area Ge diodes at low temperatures (∼90°K) are reported. These data include values of the device quantum efficiency as a function of wavelength and bias. An effect is reported in which photon‐induced changes in emissive current are observed at wavelengths up to 2 &mgr;, i.e. well beyond the absorption edge, with efficiencies 4 × 10−5. Aging characteristics associated with this long wavelength effect are described. A tentative suggestion is made that the effect is due to photon‐induced changes in the surface field leading to changes in field emission.

ISSN:0003-6951    

DOI:10.1063/1.1754933

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Epitaxial heterojunctions have been prepared by chemical vapor deposition of Ge onto (001) GaAs substrates using the hydrogen reduction of GeCl4. Scanning x‐ray microscopy revealed a cross‐grid of dislocation lines at the interface. It is believed that these two sets of misfit dislocations in the interface plane result from a partial accommodation of the lattice mismatch between Ge and GaAs.

ISSN:0003-6951    

DOI:10.1063/1.1754934

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

CW operation on five additional lines between 47 &mgr;m and 79 &mgr;m has been observed in the water vapor laser. Competitive and cascade coupling have been shown to exist between the nine presently known CW lines. These interconnections are the first reported for the water vapor laser, and may assist in the identification of the unknown lase`r species and energy levels. Lamb dips have been observed on three additional lines, and pressure‐broadened linewidths have been derived from measurements of the dips.

ISSN:0003-6951    

DOI:10.1063/1.1754935

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Thermionic emission of alkali ions from matrices composed of sintered mixtures of aluminosilicate and metal powders are studied. Results show that the emission characteristics depend on temperature, effective work function and voltage in a similar way as does electron emission. The effective work function for these composite emitters varies between 1.1 and 3.4 eV. Short‐term continuous emission densities up to 4.5 mA/cm2have been obtained.

ISSN:0003-6951    

DOI:10.1063/1.1754936

出版商:AIP    

年代:1967

数据来源: AIP