Vertical External Cavity Surface Emitting Laser (VECSEL) and Membrane External Surface Emitting Laser (MECSEL) have demonstrated their superior performance due to the flexibility in cavity design as well as power scalability. The epitaxy of different materials and band gap engineering allows the coverage of a wide spread of emission wavelength.
We present in this contribution strategies for different gain regions for devices from the red to the near-infrared spectral range, fabricated by Metal-Organic Vapor-Phase Epitaxy (MOVPE) and show the optical properties of the different gain chips and the laser performances of produced VECSEL and MECSEL.
While vertical external-cavity surface-emitting lasers (VECSELs) provide several superior laser properties, the heat generated by the pump laser within the active region proves to be a limiting factor for achieving higher output powers.
We present our recent progress in the development of an AlGaInP-VECSEL based on a grating waveguide structure. The heat spreader is placed below the active region membrane while a grating structure is etched into the top layer of the active region. This improves the heat removal from the membrane, while the guided-mode resonances should provide good coupling of the pump and laser field as well as a high reflectivity. The VECSEL cavity is completed with an external mirror, serving also as an output coupler.
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