Quantum-well intermixing in GaAs-AlGaAs structures using pulsed laser irradiation

1997 ◽  
Vol 9 (5) ◽  
pp. 587-589 ◽  
Author(s):  
B.S. Ooi ◽  
C.J. Hamilton ◽  
K. McIlvaney ◽  
A.C. Bryce ◽  
R.M. De La Rue ◽  
...  
Keyword(s):  
Quantum Well ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Quantum Well Intermixing ◽  
Pulsed Laser Irradiation

Quantum Well Intermixing in Gain As/Gainasp and Gaas/Algaas Structures Using Pulsed Laser Irradiation

1996 ◽  
Vol 450 ◽  
Author(s):  
A. C. Bryce ◽  
R. M. De La Rue ◽  
J. H. Marsh ◽  
B. S. Ooi ◽  
B. Qiu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Laser Irradiation ◽  
Spatial Resolution ◽  
Point Defects ◽  
Pulse Length ◽  
Pulsed Laser ◽  
Double Quantum ◽  
Quantum Well Intermixing ◽  
Better Than ◽  
Pulsed Laser Irradiation

ABSTRACTAn essentially impurity free, direct write and potentially high spatial resolution quantum well intermixing technique using pulsed laser irradiation is reported. This technique uses a Q-switched Nd:YAG laser emitting at 1.06 μm with a pulse length of ∼20 ns and repetition rate of 10 Hz. The typical energy densities used for both Gain As/Gain AsP and GaAs/AlGaAs structures were ∼ 5 mJ mm−2. Multiphoton interactions with carriers lead to phonon emission, the phonons interact with the lattice thus generating point defects which diffuse during a subsequent annealing stage in a rapid thermal annealer and cause intermixing. Photoluminescence measurements have demonstrated that the spatial resolution of the process is better than the resolution of the PL measurement (ie better than 25 μm) and the technique has been used to write directly a grating of period 1.25 μm into a GalnAs/GalnAsP quantum well structure. This was achieved using a grating of period 2.5 μm etched into the surface of the substrate; when illuminated by the Q-switched pulses this grating generated a volume hologram of point defects within the sample at half the etched period. A clear dip in the transmission spectrum of the waveguide which had been processed in this way was observed at 1.525 μm. Differential bandgap shifts of up to 40 meV have been observed in GaAs/AlGaAs double quantum well samples. 3 μm wide ridge waveguide lasers were fabricated from the intermixed and control samples. The threshold currents of the intermixed and the control lasers were comparable. The slope efficiency of the intermixed lasers showed insignificant changes when compared to the as-grown lasers.

Modification of structural and transport properties in epitaxial YBa2CU3Ox films by pulsed laser irradiation

1993 ◽  
Vol 3 (12) ◽  
pp. 2173-2188
Author(s):  
N. G. Chechenin ◽  
A. V. Chernysh ◽  
V. V. Korneev ◽  
E. V. Monakhov ◽  
B. V. Seleznev
Keyword(s):  
Transport Properties ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation

PULSED LASER IRRADIATION OF NICKEL THIN FILMS ON SILICON

1983 ◽  
Vol 44 (C5) ◽  
pp. C5-449-C5-454 ◽  
Author(s):  
P. Baeri ◽  
M. G. Grimaldi ◽  
E. Rimini ◽  
G. Celotti
Keyword(s):  
Thin Films ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Nickel Thin Films ◽  
Pulsed Laser Irradiation

FUNDAMENTALS OF PULSED LASER IRRADIATION OF SILICON

1983 ◽  
Vol 44 (C5) ◽  
pp. C5-23-C5-36 ◽  
Author(s):  
H. Kurz ◽  
L. A. Lompré ◽  
J. M. Liu
Keyword(s):  
Laser Irradiation ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation

Experimental evaluation of performance of concrete removal in pulsed laser irradiation

2016 ◽  
Author(s):  
Nguyen Phi Long ◽  
Hiroyuki Daido ◽  
Yukihiro Matsunaga ◽  
Tomonori Yamada ◽  
Akihiro Nishimura ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Experimental Evaluation ◽  
Pulsed Laser ◽  
Evaluation Of Performance ◽  
Pulsed Laser Irradiation

Surface modification of sintered magnesium oxide (MgO) with chromium oxide (Cr2O3) by pulsed laser irradiation in air and liquids

2021 ◽  
Author(s):  
Katia del Carmen Martínez Guzmán ◽  
Sadasivan Shaji ◽  
Tushar Kanti Das Roy ◽  
Bindu Krishnan ◽  
David Avellaneda Avellaneda ◽  
...  
Keyword(s):  
Surface Modification ◽  
Laser Irradiation ◽  
Magnesium Oxide ◽  
Chromium Oxide ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation
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