New unstable resonator suitable for low gain large aperture laser medium

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.

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...

High-power monolithic unstable-resonator solid-state laser.

We report the operation of a diode-pumped monolithic Q-switched unstable-resonator solid-state laser that generates 2.15-mJ, 2-ns pulses in a single transverse mode and a single longitudinal mode. We show that the unstable resonator is effective in suppressing the spatial and the temporal instability of the laser beam in a disk-shaped laser whose transverse dimension is comparable with or large...

Delnv - Tr - 78 - 2 Unstable Resonator Retrofitted Handheld Laser

Laterally periodic resonator for large-area gain lasers.

Laterally periodic resonators, which can be constructed by use of transversely periodic phase- or amplitude-modulating elements in a cavity, are proposed for stabilization and generation of transversely coherent output from large-area gain. Lasers with periodic resonators have the combined features of conventional cavities and laser arrays. Significant low-order transverse modes and mode discri...