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The edge-emitting semiconductor light source known as a superluminescent diode (SLED or SLD) is based on superluminescence.
It combines traditional light-emitting diodes’ low coherence with the great power and brightness of laser diodes. Its full-width at half maximum, or emission optical bandwidth, can be between 5 and 750 nm.
Similar to a laser diode, a superluminescent light emitting diode is based on an electrically driven p-n junction that, when biassed in the forward direction, transforms into an optically active region and produces enhanced spontaneous emission over a broad wavelength range.
The Global Superluminescent Diodes Market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
SLDs were originally developed in the system of arsenide materials with the aim of creating an emitter that is coupled to an optical fibre and has a low time coherence of the produced light.
At that time, waveguides were produced with an anti-reflection coating, and semiconductor emitters were constructed as double-heterostructure types.
Since there are so many possible uses for blue-violet SLD, the discovery of the first nitride SLDs has sped up considerable study and the field’s quick development. Its optical power is proportionate to the current because it is a current-limiting device.
SLDs, in contrast to laser diodes, exhibit a progressive increase in intensity with increasing current rather than a sudden one.
Fabry-Perot parasitic modulation is characterised by residual spectral modulation, which results from non-zero reflections from SLD facets.
What makes superluminescent diodes unique is their mix of output power and brightness similar to laser diodes and a wide optical spectrum similar to LEDs.
With such a high optical gain in its active region, SLD exhibits exceptional sensitivity to external optical feedback.
In the same way as laser diodes are emitters, these diodes are emitters with flawless Antireflection Coatings (AR) on the chip facets. The optical power of a superluminescent diode (SLD) light source is comparable to that of a laser diode, and even in conditions of severe heat and age, the SLD’s wavelength is unaffected.
