Comparison of SLD, LD, and LED

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Superluminescent diodes reduce coherence noise and enable the user to acquire high-precision measurement. So it is used in sensing fields, including photo-application measurement and medical images. Whereas, LEDs are usually considered light sources because they emit light waves without any liquid medium. Further, LDs are essentially laser diodes thus acting as point light sources.

Comparison of SLD, LD, and LED

Here are some of the key differences between Superluminescent Diodes, Light emitting diodes, and laser diodes:

1. Emitting State:

LD: Laser diodes have 2 reflecting coatings in which one of them prevails over the other to maintain the signal. Thus, the end facet reflectivity of one side is greater than the opposite.

SLD: Superluminescent diodes have both ends facets with non-reflecting coating. Instead of reflection, the input gets absorbed.

LED: While the other 2 maintained a unidirectional flow, LED arrangements are rather special, at an angle of 90 degrees.

2. Emitted Light:

LD: LDs emit stimulated emission light. This light is more or less similar to the input with minimal to no loss. So it is often observed in short-length applications.

SLD: SLDs are used in rather long-range applications because they amplify the spontaneous emission of light.

LED: LED also follows the principle of spontaneous emission light but without any amplification in the original input.

3. Spectral Half-Width:

LD: LDs have extremely narrow spectral half-widths, in several nanometers or less.

SLD: Superluminescent diodes have a spectral half-width range from 10-50nm.

LED: LEDs have a spectral half-width of up to 100nm. They have the broadest half-width among the three.

To see a full comparison, check our blog: Difference Between an SLD, LD, And LED.

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