Vertical cavity surface emitting lasers (VCSELs) operating in a single spatial mode necessarily incorporate small surface area and thus can emit limited output power (up to a few mW). An interesting approach to achieving high powers while preserving a high degree of spatial coherence is to phase-lock a large number of single mode emitters to form spatially coherent VCSEL arrays. The resulting 2D arrays of cavities can be treated as 2D photonic crystals, and many concepts and tools provided by photonic bands analysis can be then utilized for gaining insight and proposing solutions for efficient mode control. Using Bragg-mirror patterning techniques, we realize VCSEL-based photonic crystal structures and explore their photon mode structure.
Phase-locked VCSEL arrays
Photonic Crystal Heterostructures
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