摘要:

Spectral characteristics of doubly and singly resonant‐pulsed optical parametric oscillators are experimentally compared. It is demonstrated that the tuning accuracy of the singly resonant oscillator is at least five times better than that of the doubly resonant oscillator. In addition, a singly resonant oscillator having an efficiency as good as that of a doubly resonant oscillator is described.

ISSN:0003-6951    

DOI:10.1063/1.1652488

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Vacuum ultraviolet instrumentation compatible with simultaneous operation of the argon ion laser is described and perturbation spectroscopy on the resonance transitions of the argon ion is reported. Observations suggest a largely nonradiative destruction of the lower levels of the lasering transitions at current densities up to 300 A cm−2and within a pressure range of 0.1 to 0.5 Torr.

ISSN:0003-6951    

DOI:10.1063/1.1652489

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

An earlier letter reported microwave (70.2 GHz) measurements of the relative permittivity &egr;rof high‐resistivity GaAs in the temperature range between 100° and 300°K. This letter extends the measurements to 600°K. Over the entire temperature range 100° <T< 600°K, the permittivity is observed to fit the expression &egr;r(T) = &egr;r(0){1 + &agr;T}, where &egr;r(0) = 12.79 ± 0.10 and &agr; = 1.0 × 10−4deg−1.

ISSN:0003-6951    

DOI:10.1063/1.1652491

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The spin‐wave power transmission through a hybrid sample of YIG and InSb has been measured as a function of magnetic field strengthH0(0–1500 Oe), frequencyf(1.5–4 GHz), and temperatureT(150°–340°K). In the range of magnetostatic volume modes, a strong absorption of spin‐wave power caused by the electrons in InSb has been found. The magnetic fieldH* of maximum absorption depends onfandTin a way which can be explained by the assumption of spin‐wave‐helicon interaction.

ISSN:0003-6951    

DOI:10.1063/1.1652492

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The high‐field domains in a Gunn effect diode operating in the transit‐time mode have been probed with a pulsed electron beam in a scanning electron microscope. The collected secondary emission current, when plotted as a function of both time and distance, clearly shows the propagation from cathode to anode of a region of high electric field. The probing technique is shown to offer micron spatial and subnanosecond temporal resolution.

ISSN:0003-6951    

DOI:10.1063/1.1652493

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

High‐power, high‐efficiency lasing has been obtained from a flowing CO&sngbnd;Air&sngbnd;He laser. Maximum power was 20 W at 9% efficiency. The gas mixture was excited premixed in a liquid&sngbnd;N2&sngbnd;cooled discharge tube 144 cm long by 2 cm in diameter. Observations pertinent to the roles of the various gases are presented.

ISSN:0003-6951    

DOI:10.1063/1.1652494

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A type of surface wave with no counterpart in a purely elastic homogeneous material is shown to exist in a piezoelectric material. Expressions for the velocity of propagation of this wave are obtained for various electrical boundary conditions on the free surface of a piezoelectric half‐space.

ISSN:0003-6951    

DOI:10.1063/1.1652495

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The detailed dependence of surface state density on crystallographic orientation was determined by measuring the ac metal‐oxide‐semiconductor conductance on the surface of a thermally oxidized single‐crystal silicon hemisphere. It was found that the ⟨111⟩ poles are located at maxima, the ⟨100⟩ poles at minima, and the ⟨110⟩ poles at saddle points in the surface state density distribution. The symmetry of the surface state density distribution is generally similar to that of the ``fixed'' interface charge density, but differences are noted in the vicinity of the ⟨100⟩ directions.

ISSN:0003-6951    

DOI:10.1063/1.1652496

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The ionic mass analyzer, built by Castaing and Slodzian, has been used for the determination of oxygen isotopic diffusion concentration gradients in massive uranium dioxide samples. Two methods have been investigated: image formation from surface isotopic distributions and ionic current measurements along the axis of diffusion.

ISSN:0003-6951    

DOI:10.1063/1.1652497

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A single‐mode pulsed ruby laser was used to record reflection holograms. A photograph of the virtual image of a hologram of one of the authors is shown.

ISSN:0003-6951    

DOI:10.1063/1.1652498

出版商:AIP    

年代:1968

数据来源: AIP