Posted by Inphenix Inc on 09/19/2022

The Edge-Emitting Semiconductor Light Source: Superluminescent Diodes


The SLD (Superluminescent Diode) is a semiconductor device to emit low-coherence light of a broad spectrum like LED (Light Emitting Diode), but high brightness like LD (Laser Diode). Light emitted in a narrow active layer similar to LD can be efficiently incident to the fiber. SLD is commonly used as incoherent light source for optical sensors like OCT and optical fiber gyroscopes.

The mechanism of SLD emission is the same as semiconductor laser (LD) and light emitting diode (LED). Emission occurs by flowing forward current to a p-n junction. When a power supply is connected to the p-layer positive and the n-layer negative, electrons enter from the n-side and holes from the p-side. When the two meet at the junction, an electron drops into a hole and light is emitted.

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