摘要:

The useful nonlinear coefficients of Ba2NaNb5O15are approximately twice those of LiNbO3. This material is a filled (Asites) structure composition and at room temperature does not have the serious problem of optically induced refractive index inhomogeneities (``optical damage''). Also, the material has unique and reproducible phasematch temperatures. The electro‐optic half‐wave voltage of this material in the optimum direction is 1570 V.

ISSN:0003-6951    

DOI:10.1063/1.1755129

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Phenomena accompanying laser‐induced damage in glasses were studied, showing many analogies with laser‐induced breakdown in gases. Ionization due to multiphoton absorption, as primary cause for laser‐induced damage, is favored by these observations.

ISSN:0003-6951    

DOI:10.1063/1.1755130

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

The theoretical behavior of the elastic surface wave phase velocities is presented as a function of direction and layer thickness for a CdS layer on the (001) and (011) faces of a semi‐infinite crystal of Ge.

ISSN:0003-6951    

DOI:10.1063/1.1755131

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Laser emission at 454 m&mgr; has been obtained from 4‐methyl umbelliferone in water solution excited by a fast rise time flashlamp.

ISSN:0003-6951    

DOI:10.1063/1.1755132

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

By increasing the power of an incident microwave signal on the positive column of a mercury vapor discharge, one observes a nonlinear response. This phenomena can be explained as being due to an alteration of the density which is caused by the externally applied field.

ISSN:0003-6951    

DOI:10.1063/1.1755133

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Infrared absorption bands due to localized vibrational modes of impurities in germanium are observed at liquid‐nitrogen temperature. One pair of bands shows a Li isotope shift from frequencies of 356 cm−1and 380 cm−1with7Li to 379 cm−1and 405 cm−1with6Li; these are attributed to Li paired with Ga. Two bands are associated with the phosphorus: one, at 343 cm−1, is attributed to isolated substitutional phosphorus; the other, at 350 cm−1, is attributed to P&sngbnd;Ga pairs.

ISSN:0003-6951    

DOI:10.1063/1.1755134

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Al‐1 at. % Zn single crystals were tensile tested after 1 MeV electron irradiation near 20°K. The increase in the yield stress due to irradiation was proportional to the square root of the electron dose with a proportionality constant similar to that in aluminum. The strain rate sensitivity of the flow stress in stage I increased proportionally to the irradiation induced hardening. The electron irradiation hardening appears to be due to randomly dispersed interstitials acting as obstacles to the movement of dislocations.

ISSN:0003-6951    

DOI:10.1063/1.1755135

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Resistivity inhomogeneities in single‐crystal CdS have been studied as a function of sulfur (S2) annealing pressure. The number and severity of the inhomogeneities increase with the value of S2partial pressure and are believed to be responsible for the deterioration of ultrasonic gain in crystals annealed at pressures much above a critical pressure.

ISSN:0003-6951    

DOI:10.1063/1.1755136

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

Experiments performed on M‐O‐M sandwiches of Be&sngbnd;BeO&sngbnd;Au and Al&sngbnd;Al2O3&sngbnd;Ag have demonstrated that the electron emission of these so called thin‐film ``cathodes'' is actually due to photoemission from the counterelectrode caused by the luminescence of the device.

ISSN:0003-6951    

DOI:10.1063/1.1755137

出版商:AIP    

年代:1967

数据来源: AIP

摘要:

In this Letter we describe a technique for producing nonpseudoscopic real images from a hologram which was constructed in the normal manner. It is shown that by properly choosing the reconstructing beam it is possible to ``project'' the virtual image thus obtaining a real image. The process is likened to that of imaging the virtual image through a positive lens whose focal length and aperture are directly related to parameters of the reconstructing beam.

ISSN:0003-6951    

DOI:10.1063/1.1755138

出版商:AIP    

年代:1967

数据来源: AIP