1,720,979 research outputs found
Design and screening of highly reliable 980nm pump lasers
No full textPresents a design and screening approach that can be adopted to improve reliability of high-power 980-nm semiconductor lasers. Flared-ridge waveguide chips were realized on GRIN-SCH single-quantum-well structures. Without any screening, flared devices, thanks to the reduced peak power and current density, showed a 20% reduction in failure rate with respect to devices with straight waveguide. By adopting extended screening criteria, a more reliable population was selected, showing a reduction by a factor of two in the failure rate extrapolated at standard operating conditions
Brillouin-scattering From Shear Horizontal Surface Phonons In Silicon-on-insulator Structures - Theory and Experiment
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Surface Brillouin-scattering spectroscopy of media with nonuniform acousto-optic properties
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Intersubband relaxation time for In[sub x]Ga[sub 1−x]As/AlAs quantum wells with large transition energy
No full textIntersubband relaxation time for InxGa1-xAs/AlAs multiple quantum wells presenting a large transition energy (680 meV) is measured by means of pump and probe experiments. Differential transmission decays in about 10 ps. The possible influence of intrasubband relaxation and Γ–X coupling on intersubband decay is discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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