摘要:

Surface barrier detectors were fabricated from vapor‐grown semiinsulating CdTe. Photo‐peaks were well resolved at room temperature and at 90 % charge collection efficiency for &ggr; emitters ranging from57Co (122 keV) to60Co (1.17 and 1.33 MeV). Although a resolution of 16 % (FWHM) could be attained with137Cs (662 keV), the 1.17‐ and 1.33‐MeV peaks from60Co could not be separated.

ISSN:0003-6951    

DOI:10.1063/1.1653305

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Light‐scattering images are recorded in nearly real‐time in nematic liquid crystals. The material is activated by ultraviolet exposure of a photoconductive ZnS layer on one of the Nesa electrodes with which an electrical field is applied. In a room‐temperature nematic liquid crystal, an incident ultraviolet exposure pulse of 0.1 mJ/cm2produces an image in a risetime of 0.1 sec, and it decays in 2.5 sec. Long‐lived images can be stored in nematic/cholesteric mixtures.

ISSN:0003-6951    

DOI:10.1063/1.1653306

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The standing‐wave saturation resonances are observed by subjecting the CO2absorber gas to the standing‐wave 10.6‐&mgr; laser field and detecting the change induced in the entire 4.3‐&mgr; (001) → (000) spontaneous emission band as the laser frequency is tuned within the Doppler profile of a specific 10.6‐&mgr; transition. Long‐term stabilization on any oscillating transition is achieved.

ISSN:0003-6951    

DOI:10.1063/1.1653307

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The nonlinear optical coefficientsd11(Te) andd14(GaAs) have been determined relative tod+(Ag3SbS3), pyrargyrite, in second harmonic generation (SHG) experiments at 10.6&mgr;. Based on an absolute value ford+(Ag3SbS3) previously determined, we find thatd11(Te) = (22±7) × 10−7esu, andd14(GaAs) = (3.2±1) × 10−7esu. The value for Te is significantly less than the previously accepted values.

ISSN:0003-6951    

DOI:10.1063/1.1653308

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The quantum yield of a semiconductor thin‐film photocathode, operating in the transmission mode, has been derived from the continuity equation and light multiple reflections within the film and the substrate. The fit between experiment and theory is good forhv<1.7 eV. The differences between experiment and theory are explained in terms of the nonuniform population of defect states within the film. Electron diffusion lengths are found to be 0.3&mgr; for the 1×1019Zn‐doped 2.5‐&mgr; ‐thick film and 0.1&mgr; for the 3×1019Zn‐doped 0.85‐&mgr; ‐thick film, respectively.

ISSN:0003-6951    

DOI:10.1063/1.1653309

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Light modulation by an electro‐optical material is under examination as an approach to real‐time display for sampled holograms. The feasibility of obtaining reconstructed images from coherent light transmitted through a deuterated KH2PO4crystal (DKDP) having a holographic charge pattern has been demonstrated. A special advantage in the image‐to‐back‐ground intensity ratio, factors influencing resolution, and problems peculiar to the use of DKDP are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1653310

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The dependence of the anisotropy of the resistive critical field of severely deformed Nb on plastic strain and temperature, the anomalously large stress dependence, and the existence of resistive transitions in fields up to 48 kG all confirm the role of the dislocation cell wall in giving rise to critical‐field enhancement in this material.

ISSN:0003-6951    

DOI:10.1063/1.1653311

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Experimental results are presented on a transverse‐flow chemical laser using the reaction of atomic oxygen with carbon disulfide. The design of this device has allowed fast mixing and rapid flow of the reaction products into and out of the volume of the laser optical fields. Primarily because of the transverse flow, the measured output powers are more than one order of magnitude greater than those of similar longitudinal‐flow devices. The addition of cold CO to the reaction increases the output power by a factor of typically 2, and may be due to an additional laser‐excitation mechanism.

ISSN:0003-6951    

DOI:10.1063/1.1653312

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Mode locking of the He&sngbnd;Cd laser has been achieved at 4416 and 3250 Å using an intracavity acoustic loss modulator. Pulses narrower than 150 psec with a peak power greater than 1.6 W were obtained at 4416 Å when a special Cd isotope mixture was used. Pulses of the order of 400 psec with a peak power of 0.1 W were obtained at 3250 Å using naturally occurring Cd.

ISSN:0003-6951    

DOI:10.1063/1.1653313

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Ultrasonic amplification in InSb under the transverse magnetic field in the high electric field has been performed at 77°K. In lower magnetic field, the increase of the acoustic gain which can be attributed to the Doppler‐shifted amplification has been observed in the high electric‐field region. The results can give a general explanation of two modes of the acousto‐electric current oscillations.

ISSN:0003-6951    

DOI:10.1063/1.1653314

出版商:AIP    

年代:1970

数据来源: AIP