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Your search keyword '"Gualtieri, D. M."' showing total 34 results
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34 results on '"Gualtieri, D. M."'

2. Laser-Induced Photochromic Centers in Ce(3+):La2Be2O5

Author

Cheung, Y. M, Gayen, S. K, and Gualtieri, D. M

Subjects
Lasers And Masers
Abstract

Intense 355-nm excitation of the lowest 4f to 5d transition of Ce(3+):La2Be2O5 leads to a brownish coloration of the crystal due to the formation of stable photochromic centers. These centers are characterized by a broadband absorption spectrum that spans the 220-840 nm spectral range. Since they can be readily bleached by optical excitation into their absorption band, the centers are photochromic. They are produced by a two-step photoionization of Ce(3+) ions followed by attachment of the detached electrons at trapping sites in the crystal. The dependence of the number of centers on laser intensity and length of exposure have been measured, and the kinetics of growth have been studied.

Published
1995

3. Epitaxial waveguides of aluminum garnet.

Author

Gualtieri, D. M. and Morris, R. C.

Subjects
*WAVEGUIDES, *ALUMINUM compounds, *EPITAXY, *GARNET
Abstract

Studies epitaxial waveguides of high refractive index aluminum garnets. Overview of previous studies on garnet waveguides; Description of procedures specific to the epitaxy of aluminum garnets; Characterization of garnet waveguides.

Published
1993
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7. Improvement of FMR linewidth in Bi-substituted lutetium iron garnet thin films for the MSW-optical-mode interaction.

Author

Silliman, S. D., Gualtieri, D. M., and Stancil, D. D.

Subjects
*FERROMAGNETIC resonance, *BISMUTH, *LUTETIUM, *THIN films
Abstract

Deals with the improvement of ferromagnetic resonance linewidth in bismuth-substituted lutetium iron garnet thin films for the magnetostatic wave-optical-mode interaction. Film growth; Description of the optical properties of the films; Background on ferromagnetic resonance.

Published
1993
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8. Magneto-optical waveguides of aluminum garnet.

Author

Gualtieri, D. M.

Subjects
*MAGNETOOPTICS, *WAVEGUIDES, *ALUMINUM, *GARNET, *EPITAXY
Abstract

Studies the magneto-optical waveguides of aluminum garnet. Epitaxy of the magneto-optical iron garnets; Establishment of the liquid phase epitaxy technique for aluminum garnets; Composition suited for magneto-optical waveguides.

Published
1993
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9. Effect of sodium doping of rare-earth iron garnet films on magnetic and magneto-optic properties.

Author

Ramesh, M., Gualtieri, D. M., Silliman, S. D., Peruyero, J., and Stancil, D. D.

Subjects
*SODIUM, *LUTETIUM, *GARNET, *MAGNETOOPTICS
Abstract

Focuses on a study which investigated the effect of the incorporation of sodium into bismuth-doped lutetium iron garnet lattice on the magnetic and magneto-optical properties of the lattice. Theoretical background of the study; Experimental procedures; Results and discussion.

Published
1991
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10. Bismuth rare-earth iron garnet composition for a magneto-optical wheel rotation rate sensor.

Author

Gualtieri, D. M., Emo, S. M., and Kinney, T. R.

Subjects
*FIBER optics, *MAGNETOOPTICS, *GARNET, *DETECTORS
Abstract

Presents a study that developed a magneto-optical garnet composition for use in a multimode, two-port, fiberoptic wheel rotation rate sensor for aerospace applications. Features of the sensor; Components of the sensor; Operation of the sensor.

Published
1991
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11. Magneto-optical properties of the Ca:(yttrium iron garnet) epitaxial-layer–substrate interface on gadolinium gallium garnet.

Author

Gualtieri, D. M.

Subjects
*MAGNETOOPTICAL devices, *INTERFACES (Physical sciences), *YTTRIUM iron garnet, *GADOLINIUM gallium garnet, *GALLIUM
Abstract

Presents a study which examined the magneto-optical properties of the calcium:(yttrium iron garnet) (YIG) epitaxial-layer-substrate inferface on gadolinium gallium garnet. Details of the YIG growth; Measurements; Discussion and conclusions.

Published
1990
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12. 57Fe-YIG: Narrow x-ray linewidth epitaxial layers on Gd3Ga5O12.

Author

Gualtieri, D. M., Lavender, W., and Ruby, S. L.

Subjects
*MAGNETIC bubbles, *YTTRIUM iron garnet, *X-ray diffraction
Abstract

Deals with a study which made several modifications to the liquid-phase epitaxial process for magnetic bubble memory layers in the growth of nuclear Bragg diffraction-Y[sub3]FE[sub5]O[sub12] (YIG) layers. Substrates for magnetic bubble layers; Observations on the YIG layer growth; Presentation of X-ray diffraction measurements.

Published
1988
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14. Magnetostatic wave propagation losses in thorium-substituted YIG.

Author

Halchin, D. J., Stancil, D. D., Gualtieri, D. M., and Tumelty, P. F.

Subjects
THORIUM, MAGNETOSTATICS, DELAY lines, YTTRIUM iron garnet
Abstract

Studies the effect of the addition of thorium on the propagation of magnetostatic forward volume waves at X band using a differential path delay line. Growth conditions of films of thorium substituted yttrium-iron garnet; Quantity that is useful in determining the quality of a thin ferrite film for propagation of magnetostatic waves; Conclusion.

Published
1985
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34. Circuitry for the contactless detection of superconducting transitions.

Author

Gualtieri DM

Abstract

Complete circuitry is presented for the detection of the superconducting transition in powders, or specimens for which the standard four-point resistance measurement cannot be performed. Specimens are placed within an inductance coil, and the change in the coil reactance is monitored as a function of temperature. The sensitivity is sufficient to detect the superconducting transition in 10(-3) cm(3) of lead, and only four integrated circuit packages are required.

Published
1978
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