摘要:

The characteristics of a mercury vapor filter based on the principle of selective specular reflection are described. The filter passband is in the region of 2536.5 Å and its bandwidth can be varied from 0.1 to 1 Å by changing the vapor pressure. The device is used in an atomic emission flame photometer. A photograph of the distribution of Hg* in the flame is also obtained.

ISSN:0003-6951    

DOI:10.1063/1.1655097

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Schottky diodes have been used for the first time as harmonic mixers in the 0.1–1.0‐mm wavelength region. Beat notes between the 33rd harmonic of a 74‐GHzV‐band klystron and 118.8‐&mgr; laser radiation are observed directly without the need of narrow‐band synchronous detection. The demonstrated performance of these room‐temperature diodes as wide‐band or heterodyne detectors of submillimeter radiation and their rugged construction make them superior to current point contact devices.

ISSN:0003-6951    

DOI:10.1063/1.1655098

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Low‐loss dielectric optical waveguides have been made by a new process in which a photochemical reaction is used to lock or fix a dopant in a polymer film with a lower refractive index, and unreacted dopant is then removed by heating. Narrow guides ([inverted lazy s]4 &mgr;m wide, &Dgr;n[inverted lazy s] 1%) were formed by laser beam writing at &lgr;=364 nm or by contact printing at &lgr;=313 nm, and had losses of 0.20±0.05 dB/cm at &lgr;=633 nm.

ISSN:0003-6951    

DOI:10.1063/1.1655099

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

The physical origin of the highly nonlinear current‐voltage relation in metal oxide varistors is shown to be consistent with Fowler‐Nordheim tunneling.

ISSN:0003-6951    

DOI:10.1063/1.1655100

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

The AlxGa1−xP alloys having compositions up tox= 0.74 are prepared by slow cooling from Ga‐rich Al&sngbnd;Ga&sngbnd;P solutions. The composition of the alloy is accuratley determined from the density measured by using the flotation method. The alloy composition almost corresponds to the atomic ratio of Al to P in the initial mixture. The energy gap and the green‐band emission peak of the alloy vary linearly to the higher‐energy side as the Al concentration increases.

ISSN:0003-6951    

DOI:10.1063/1.1655101

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

The question regarding the role of silicon as a residual impurity in high‐purity GaAs is resolved by the use of careful doping experiments and high‐resolution far‐infrared spectroscopy. The results indicate that silicon is readily incorporated into the material as a simple substitutional donor with a binding energy of 5.854 meV and show that silicon is a major, but not necessarily the dominant, residual donor in high‐purity vapor and liquid epitaxial GaAs.

ISSN:0003-6951    

DOI:10.1063/1.1655102

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Optical gating with LiTaO3single crystals is demonstrated using an absorbing LiTaO3:Cr detector directly coupled to a LiTaO3electro‐optic modulator. Since no electrical power is required, such a gating scheme provides a simple basis for optical logic in pyroelectric waveguides.

ISSN:0003-6951    

DOI:10.1063/1.1655103

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Room‐temperature laser diodes which emit coherent infrared radiation near 1.1 &mgr;m have been prepared from InxGa1−xAs (x[inverted lazy s]0.23) vapor‐grownp‐njunction structures. At 77°K, laser threshold current densities as low as 1210 A/cm2and external differential quantum efficiencies as high as 50% have been obtained at 1.08 &mgr;m. At 300°K, the threshold current densities are between 70 000 and 98 000 A/cm2for emission at 1.145 &mgr;m.

ISSN:0003-6951    

DOI:10.1063/1.1655104

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A new scheme for electro‐optical tuning of tunable lasers is described. Tuning rates and tuning ranges in cw dye lasers nearly 100 times greater than those previously reported using a comparable‐sized electro‐optical crystal have been achieved using this method.

ISSN:0003-6951    

DOI:10.1063/1.1655105

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

We have determined experimentally a limitation for nanosecond CO2pulse amplification at atmospheric pressure in 5:1:1 He:CO2:N2gas mixtures. We find that the refraction effect, self‐defocusing, will present difficulties both in the amplification of a nanosecond CO2laser pulse to substantial energies and in subsequent laser fusion experiments where the laser beam is to be focused onto a target.

ISSN:0003-6951    

DOI:10.1063/1.1655106

出版商:AIP    

年代:1974

数据来源: AIP