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Superluminescent Light Emitting Diodes: Device Fundamentals and Reliability

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Superluminescent Light Emitting Diodes: Device Fundamentals and Reliability

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SLED is an edge-emitting semiconductor light source. The unique property of an SLED is its high output power and low beam divergence, similar to an injection laser diode (LD), but with a broad emission spectrum and low coherence, similar to a light emitting diode (LED). SLEDs are similar in geometry to lasers but have no built-in optical feedback mechanism required by LDs for stimulated emission to achieve lasing. Main difference for SLED operations comparing with LDs are: much higher gain, much higher current density and much stronger non-uniformity of photons and carrier density distribution inside the active region. SLEDs have structural features similar to those of LEDs that suppress the lasing action by reducing the reflectivity of the facets.

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