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15 Dec 1968

Volume 13, Issue 12, pp. 399-427


SOME SPECTRAL PROPERTIES OF DOUBLY AND SINGLY RESONANT PULSED OPTICAL PARAMETRIC OSCILLATORS

J. E. Bjorkholm

Appl. Phys. Lett. 13, 399 (1968); http://dx.doi.org/10.1063/1.1652488 (3 pages) | Cited 16 times

Online Publication Date: 17 October 2003

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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.

VACUUM ULTRAVIOLET PERTURBATION SPECTROSCOPY ON THE ARGON ION LASER

H. Merkelo, R. H. Wright, J. P. Kaplafka, and E. P. Bialecke

Appl. Phys. Lett. 13, 401 (1968); http://dx.doi.org/10.1063/1.1652489 (3 pages) | Cited 3 times

Online Publication Date: 17 October 2003

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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−2 and within a pressure range of 0.1 to 0.5 Torr.

MICROWAVE PERMITTIVITY OF THE GaAs LATTICE AT TEMPERATURES BETWEEN 100°K AND 600°K

Tong Lu, Gary H. Glover, and Keith S. Champlin

Appl. Phys. Lett. 13, 404 (1968); http://dx.doi.org/10.1063/1.1652491 (1 page) | Cited 7 times

Online Publication Date: 17 October 2003

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An earlier letter reported microwave (70.2 GHz) measurements of the relative permittivity ϵr of 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 ϵr(T) = ϵr(0){1 + αT}, where ϵr(0) = 12.79 ± 0.10 and α = 1.0 × 10−4 deg−1.

INTERACTION BETWEEN SPIN WAVES AND ELECTRONS IN A HYBRID STRUCTURE OF YIG AND InSb

B. Schneider

Appl. Phys. Lett. 13, 405 (1968); http://dx.doi.org/10.1063/1.1652492 (3 pages) | Cited 1 time

Online Publication Date: 17 October 2003

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The spin‐wave power transmission through a hybrid sample of YIG and InSb has been measured as a function of magnetic field strength H0 (0–1500 Oe), frequency f (1.5–4 GHz), and temperature T (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 field H* of maximum absorption depends on f and T in a way which can be explained by the assumption of spin‐wave‐helicon interaction.

PROBING OF GUNN EFFECT DOMAINS WITH A SCANNING ELECTRON MICROSCOPE

G. Y. Robinson, R. M. White, and N. C. MacDonald

Appl. Phys. Lett. 13, 407 (1968); http://dx.doi.org/10.1063/1.1652493 (2 pages) | Cited 4 times

Online Publication Date: 17 October 2003

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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.

HIGH POWER CO☒N2☒He LASER

R. M. Osgood and W. C. Eppers

Appl. Phys. Lett. 13, 409 (1968); http://dx.doi.org/10.1063/1.1652494 (3 pages) | Cited 29 times

Online Publication Date: 17 October 2003

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

A NEW SURFACE WAVE IN PIEZOELECTRIC MATERIALS

Jeffrey L. Bleustein

Appl. Phys. Lett. 13, 412 (1968); http://dx.doi.org/10.1063/1.1652495 (2 pages) | Cited 233 times

Online Publication Date: 17 October 2003

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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.

CRYSTALLOGRAPHIC SYMMETRY OF SURFACE STATE DENSITY IN THERMALLY OXIDIZED SILICON

Emil Arnold, Joshua Ladell, and Gerald Abowitz

Appl. Phys. Lett. 13, 413 (1968); http://dx.doi.org/10.1063/1.1652496 (4 pages) | Cited 19 times

Online Publication Date: 17 October 2003

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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.

OXYGEN ISOTOPIC CONCENTRATION GRADIENT DETERMINATION WITH THE CAMECA ION MASS ANALYZER

P. Contamin and G. Slodzian

Appl. Phys. Lett. 13, 416 (1968); http://dx.doi.org/10.1063/1.1652497 (2 pages) | Cited 7 times

Online Publication Date: 17 October 2003

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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.

PULSED LASER REFLECTION HOLOGRAMS

R. G. Zech and L. D. Siebert

Appl. Phys. Lett. 13, 417 (1968); http://dx.doi.org/10.1063/1.1652498 (2 pages) | Cited 1 time

Online Publication Date: 17 October 2003

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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.

PICOSECOND PULSE MEASUREMENT BY TWO‐PHOTON EXCITATION OF PHOTOGRAPHIC FILM

David C. Burnham and Kenneth W. Billman

Appl. Phys. Lett. 13, 419 (1968); http://dx.doi.org/10.1063/1.1652499 (3 pages) | Cited 5 times

Online Publication Date: 17 October 2003

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A simple technique for observing picosecond light pulses is demonstrated. The overlap between two light beams is measured by two‐photon excitation of a photographic film which is below threshold for one‐photon excitation. The resolution of the method is variable and limited only by the bandwidth of the photographic film.

BAND STRUCTURE AND DIRECT TRANSITION ELECTROLUMINESCENCE IN THE In1−xGaxP ALLOYS

M. R. Lorenz, W. Reuter, W. P. Dumke, R. J. Chicotka, G. D. Pettit, and J. M. Woodall

Appl. Phys. Lett. 13, 421 (1968); http://dx.doi.org/10.1063/1.1652500 (3 pages) | Cited 36 times

Online Publication Date: 17 October 2003

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The position of the (1, 0, 0) minima in InP are determined from measurements in the region of interconduction band absorption. Direct transition electroluminescence in the In1−xGaxP alloys is observed over a range of alloys up to x = 0.8 and photon energies of up to 2.2 eV at 300°K and is consistent with the bandstructure determined for InP and that of GaP.

STRONG MODE COUPLING INDUCED IN A GAS LASER BY AN INTRACAVITY SATURABLE ABSORBING MEDIUM

M. S. Feld, A. Javan, and P. H. Lee

Appl. Phys. Lett. 13, 424 (1968); http://dx.doi.org/10.1063/1.1652501 (4 pages) | Cited 12 times

Online Publication Date: 17 October 2003

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Although gas lasers generally operate in the weak mode‐coupling regime, one may induce strong coupling, hence single‐moding, by means of a saturable absorbing medium placed within the resonator. The effect occurs under conditions where, although the linear gain of the amplifier cell may exceed the linear loss of the absorption cell, the absorber may saturate more heavily than the amplifier. The analysis, based on the coupled energy‐balance equations, indicates that the power in the surviving mode may be considerably enhanced.
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