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Quantum dot laser diodes are expected to replace conventional semiconductor laser diodes in new high-speed information and communication devices. We successfully fabricated disk-shaped quantum dots using a bio-template and neutral beam etching. Our original top-down process achieved defect-less and a high density of dots from etching process compared with conventional plasma processes. Therefore,...
We propose an optically controlled multiple-beam phased array antenna employing spatial and wavelength multiplexing. We have developed the prototype of the optical beam-former, which enables control of 10 beams individually, and demonstrated at 18 GHz.
We found that tighter focal spots with longer depths of focus are achieved by radially polarized annular beams with controlled inner and outer radii, which could lead to high-tolerance, super-resolution applications in compact optical systems.
Advances in high-efficiency, large-area, surface-emitting photonic-crystal lasers have been developed to achieve peak emission powers of 35 W with a slope efficiency of 0.7 W/A for a total device area of ~0.4 mm2.
We designed a 1.06-mum single-quantum-well (SQW) InGaAs/AlGaAs planar tapered amplifier that was injected with seed light of a fiber Bragg grating stabilized laser diode through a fiber biconical microlens. To increase the amplifier output, the microlens with approximately 3- and 11-mum radii on vertical and horizontal axes, respectively, provides high coupling efficiency between the laser diode and...
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