Semiconductor laser resonator for magneto-optic floppy disk head

Semiconductor nanowire ring resonator laser.

Nanowires of the wide band-gap semiconductor gallium nitride (GaN) have been shown to act as room-temperature uv lasers. Recent advances in nanomanipulation have made it possible to modify the shape of these structures from a linear to a pseudoring conformation. Changes to the optical boundary conditions of the lasing cavity affect the structure's photoluminescence, photon confinement, and lasi...

Confocal unstable-resonator semiconductor laser.

GaAs/GaAlAs heterostructure lasers with a monolithic confocal unstable resonator were demonstrated. The curved mirrors satisfying the confocal condition were fabricated by etching. Close to threshold, the lasers operate in a single lateral mode with a nearly collimated output beam. A single-lobe far-field intensity distribution as narrow as 1.9 degrees full width at half maximum was measured.

Magneto-optic Laser Beam Steering

An Active Flying Slider for Magneto-Optic Disk Focusing

Low mass flying heads for magneto-optic recording would yield fast access times. A design concept for such a head was proposed and computer modeling of its flying characteristics were conducted. Calculations indicated that the head (slider) will follow low frequency undulations the disk (resulting from disk run-out and disk warp) to within one depth of focus of the read/write beam. Thus the ill...

High-Brightness Unstable-Resonator Semiconductor Laser Diodes

High-power high-brightness unstable-resonator edge-emitting semiconductor laser diodes with dry-etched curved mirrors were fabricated and characterized. The epitaxial structure was optimized for high output power operation and consists of a GaAs/AlGaAs gradedindex separate-confinement heterostructure (GRINSCH) with a single 980-nm-emitting InGaAs quantum well. The curved mirrors of the unstable...