- Superluminescent LEDs target displays
- COMPOUND SEMICONDUCTOR
as speckle. This is a particularly troublesome for augmented-reality applications, where high-fidelity images are critical. Despeckling solutions have been developed to minimize interference. But success is limited, and the hardware that is required is often too bulky or expensive to incorporate into consumer electronic devices. What’s needed is a source that combines the best attributes of the laser and the LED. And the good news is that this device already exists, in the form of a superluminescent LED (SLED). It provides a directional light source with a broadband emission spectrum that yields a low degree of speckle noise and a high image quality (see Figure 1).