摘要:

We have demonstrated operation of birefringent phase‐matched TeO2deflectors, utilizing the second optical diffraction order, which maintain high diffraction efficiency with doubled resolution. 1200‐spot resolution was achieved with 25‐&mgr;sec access time.

ISSN:0003-6951    

DOI:10.1063/1.88290

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Very efficient mixing has been observed between a longitudinal wave and a transverse acoustic wave propagating noncollinearly inside an arsenic trisulfide delay line. The scattering of the longitudinal wave by the transverse one has also been investigated.

ISSN:0003-6951    

DOI:10.1063/1.88291

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The skin thicknesses of blisters formed on niobium by helium‐ion irradiation at room temperature for energies from 100 to 1500 keV have been measured. The projected ranges of helium ions in Nb for this energy range were calculated using either Brice’s formalism or the one given by Schiott. For the damage‐energy distribution Brice’s formalism was used. The measured skin‐thickness values corrleate more closely with the maxima in the projected‐range probability distributions than with the maxima in the damage‐energy distributions. The results are consistent with our model for blister formation and rupture proposed earlier.

ISSN:0003-6951    

DOI:10.1063/1.88292

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Observations of acoustic interruption of x‐ray transmission through a high‐quality silicon crystal with a low dislocation density are described. Borrmann x‐ray topographs are used to visualize the acoustic strain field. Meausrements were made of the variation of x‐ray transmission vs acoustic power. The possible application of this effect as a fast acousto‐optic switch mechanism is discussed.

ISSN:0003-6951    

DOI:10.1063/1.88293

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Appreciable quantities of molecular hydrogen ions have been observed in backscattering of 5‐keV D3+from Au. At a scattering angle of 10° the D+2/D+1ratio was 5×10−2and D+3/D+1=2×10−4. The ratios decrease with increasing scattering angle, but D+2is observable at angles up to 50°.

ISSN:0003-6951    

DOI:10.1063/1.88294

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

K&bgr;emission spectra from Al and Si dissolved in transition (Fe and Ni) or noble (Cu) metals as dilute impurities (∼10 at.%) were investigated. In the alloys of the same host metals the spectra of Al and Si bear a striking resemblance to each other. However, there are several important differences between the shapes of the spectra from transition‐ and noble‐metal‐based alloys. All these features of the spectra can be reasonably interpreted in terms of the theoretical calculation by Terakura on the energy distribution of the local density of states of the impurity atoms.

ISSN:0003-6951    

DOI:10.1063/1.88295

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Integration of a taper‐coupled GaAs‐AlxGa1−xAs laser with a linear electro‐optic modulator permits efficient optical frequency modulation of the laser emission. The pulsed room‐temperature threshold current density of the device was 8 kA/cm2. Frequency modulation depth in excess of 15 GHz (corresponding to a wavelength shift of 0.4 A˚) was obtained with a reverse bias change of 20 V across the modulator. Conversion of frequency modulation into intensity modulation was demonstrated with a characteristic powerP0of 10 &mgr;W/MHz for 90% intensity modulation. It is shown that reduction ofP0by an order of magnitude is easily feasible.

ISSN:0003-6951    

DOI:10.1063/1.88296

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

We have used the resonance radiation pressure from 40 mW of cw dye laser light propagating axially down a tube filled with sodium vapor to increase the sodium pressure (density) up to 50% over a length of 20 cm. The magnitude of the effect agrees well with measurements of the absorbed power. These observations were made with the laser tuned to the low‐frequency side of the sodiumD2resonance line; for tuning to the high‐frequency side, an additional unexplained effect leading to density decreases was observed.

ISSN:0003-6951    

DOI:10.1063/1.88297

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A method is reported for the determination of the surface recombination velocity by scanning electron microscopy; this method is based on an established relationship between the effective diffusion length of the minority carriers, the penetration depth of the electron beam, and the surface recombination velocity. Values of surface recombination velocity, up to about 2.5×106cm/sec were determined inn‐type GaAs with a bulk minority‐carrier lifetime of the order of 10−8–10−10sec; in GaAs, with carrier concentrations exceeding 1018cm−3, recombination velocity of about 3×106cm/sec represents a saturation value.

ISSN:0003-6951    

DOI:10.1063/1.88276

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Using a preionization scheme based on the Malter effect, small‐signal gains ≳5%/cm at 10.6 &mgr;m ahve been produced in a 1‐mm2‐cross‐section waveguide CO2amplifier at total operating pressures of 100–760 Torr. Comparisons are made between this preionization scheme and those using electron beams.

ISSN:0003-6951    

DOI:10.1063/1.88277

出版商:AIP    

年代:1975

数据来源: AIP