摘要:

cw laser action at 81.5 and 263.4 &mgr;m, corresponding to a rotational transition and an inversion transition in thev2state of NH3, has been obtained by optically pumping the gas with an N2O laser.

ISSN:0003-6951    

DOI:10.1063/1.1653432

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Epitaxial AlAs was grown on GaAs substrates, and polycrystalline AlAs films were deposited on quartz. The visible optical absorption edge indicated that the direct band gap was 3.5 eV while the indirect gap was 2.2 eV. Infrared interference fringes were measured and the high‐frequency dielectric constant was determined to be 15.2. The transverse restrahl frequency was 400 cm−1.

ISSN:0003-6951    

DOI:10.1063/1.1653433

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

An increase in far‐infrared photoconductivity caused by near‐infrared light has been observed. A number of possible explanations are given for the experimental observations. The potential use of this technique for experiments beyond 100&mgr; is suggested.

ISSN:0003-6951    

DOI:10.1063/1.1653434

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Field‐assisted reemission has been observed at low temperatures for charge carriers captured by shallow ionized donor and acceptor states in germanium. The observed behavior is well explained by the three‐dimensional Poole‐Frenkel theory at moderate field strength (400–1000 V cm−1); at higher fields, other effects dominate the reemission process.

ISSN:0003-6951    

DOI:10.1063/1.1653435

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The anomalous doping behavior of Si regrown from In solution was studied by (1) Schottky barrier evaluation of conductivity type, (2) electron microprobe analysis for phosphorus, and (3) channeling effect measurements for interstitial In. The latter showed In present at ∼ 1019cm−3, but not occupying a regular substitutional or interstitial position. A correlation was found in the first two measurements between phosphorus contamination andn‐type conductivity. When the In was contacted only by quartz freshly etched in HF, then‐type behavior and phosphorus contamination disappeared. The anomalous doping behavior is most likely due to phosphorus inpurity picked up by the In.

ISSN:0003-6951    

DOI:10.1063/1.1653436

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Some ternary groups 1VA‐VA‐V1A nonoxide glasses have been found which have very low acoustic losses of the order of fused silica, low values of sound velocity, and very high acousto‐optic figures of merit. Their optical transmission range is 1 – 12&mgr;. The unusual combination of these parameters in a chemically stable isotropic medium make these glasses attractive for us in acoustic and acousto‐optic devices operating at infrared wavelengths.

ISSN:0003-6951    

DOI:10.1063/1.1653438

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Diffraction of laser light from bulk waves present in a LiNbO3surface wave delay line has been used to probe surface wave mode conversion. Up to 4% of the power present in a surface wave incident on a reactively loaded interdigital transducer has been observed to be scattered into shear waves. In addition, a driven interdigital transducer has been seen to radiate bulk waves with directivity properties well described by a phased array antenna model.

ISSN:0003-6951    

DOI:10.1063/1.1653439

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The observation of coupling and consequent coherent operation of two adjacent parallel stripe‐geometry GaAs lasers in a monolithic structure is reported. Coupling is obtained when the distance between the lasers is small enough to allow the optical field of one laser to penetrate into the active region of the other.

ISSN:0003-6951    

DOI:10.1063/1.1653440

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Light‐emitting InP diodes were made by liquid‐phase epitaxy. The most efficient diodes result when then‐type layers are grown from a Sn‐doped melt, while thep‐type layers are grown from the same melt, but overcompensated with Zn. External quantum efficiencies up to 0.75% at room temperature and 11.7% at 77°K were observed in uncoated diodes. Threshold current densities for stimulated emission were as low as 750 A/cm2at 77°K. Spontaneous emission can be observed normal to thep‐njunction.

ISSN:0003-6951    

DOI:10.1063/1.1653441

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Mode locking of a transversely excited atmospheric‐pressure CO2laser has been achieved through the use of a germanium acousto‐optic modulator. Subnanosecond pulse widths and peak powers in excess of 1 MW have been obtained.

ISSN:0003-6951    

DOI:10.1063/1.1653442

出版商:AIP    

年代:1970

数据来源: AIP