Abstract
Unstable resonator semiconductor lasers (URSL) have been demonstrated as a high power source with large mode volumes and the ability to defocus, and hence suppress, filamentation.1 A special feature of semiconductor lasers is that, regardless of longitudinal cavity configuration, the optical field is confined in both the lateral and transverse directions as a result of differences in the dielectric constant, and stable guided modes are produced. These waveguiding effects occur even in the ostensibly open-walled gain-guided devices due to the step in the complex dielectric constant at the edge of the gain region, in the case of URSL, an additional real-index waveguide may be incorporated to reduce the diffraction losses of the cavity and obtain a higher external quantum efficiency.2
© 1985 Optical Society of America
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