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Your search keyword '"Hernández S"' showing total 15 results
Start Over Author "Hernández S" Journal applied physics letters
15 results on '"Hernández S"'

14. Self-assembly of compositionally modulated Ga1-xMnxAs multilayers during molecular beam epitaxy.

Author

Gallardo-Hernández, S., Martinez-Velis, I., Ramirez-Lopez, M., Kudriatsev, Y., Escobosa-Echavarria, A., Luiz Morelhao, S., and Lopez-Lopez, M.

Subjects
*MOLECULAR beam epitaxy, *MASS spectrometry, *MANGANESE, *MASS (Physics), *MOLECULAR dynamics
Abstract

GaMnAs structures were grown on GaAs(100) substrates by molecular beam epitaxy employing different growth parameters. We studied manganese incorporation employing secondary ion mass spectrometry (SIMS). At a growth temperature of 300 °C, we observed a self-assembled modulation of the manganese concentration. SIMS depth profiles were analyzed employing a depth resolution function taking into account sputtering-induced broadening of the original distribution and segregation. We found a Mn segregation length along the growth direction of ∼4 nm. The presence of GaMnAs multilayers was corroborated by high-resolution x-ray diffraction. Spinodal decomposition is a possible mechanism for the spontaneous formation of the multilayer structure. [ABSTRACT FROM AUTHOR]

Published
2013
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15. Optical amplification in Ho3+-doped transparent oxyfluoride glass ceramics at 750 nm.

Author

Lahoz, F., Hernández, S. E., Capuj, N. E., and Navarro-Urrios, D.

Subjects
*OPTICS, *FLUORIDE glasses, *CERAMICS, *ULTRASHORT laser pulses, *RARE earth ions
Abstract

Positive transient optical gain has been demonstrated in Ho3+-doped transparent oxyfluoride glass-ceramics. A pump and probe experiment has been designed to show this result. High power laser pulses at 532 nm were used as the pump source to strongly populate the Ho3+ 5S2:5F4 level due to nonresonant ground state absorption. Low power cw laser radiation at 750 nm was used as the probe beam. The signal beam stimulates the emission associated with the Ho3+ 5S2:5F4→5I7 electronic transition at 750 nm. In addition to this, the high power pump pulses provide population inversion between the 5S2:5F4 and 5I7, initial and final states of the transition, respectively, giving rise to the optical amplification of the signal beam. A gain coefficient of 3.7 cm-1 (∼16 dB/cm) was obtained for a pump energy density of about 135 mJ/cm2 and a signal beam power density of 6 μW/cm2. [ABSTRACT FROM AUTHOR]

Published
2007
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