What does SLD stand for in OCT light sources?

What does SLD stand for in OCT light sources?

• A. Scattered Laser Diode
• B. Solid-state Laser Diode
• C. Superluminescent Diode
• D. Superluminal Diode

Answer: (C)

In OCT, the light source needs a broad spectrum to achieve high axial resolution, and a Superluminescent Diode provides that with a broad, smooth spectral output and relatively low temporal coherence. This combines LED-like broadband emission with higher brightness and good fiber coupling, giving short coherence length without the high spatial coherence of a laser diode. That makes it a common and effective choice for OCT light sources. The other terms aren’t standard devices used in OCT naming—scattered laser diode, solid-state laser diode, and superluminal diode don’t describe the broadband, low-coherence source that OCT relies on.

In OCT, the light source needs a broad spectrum to achieve high axial resolution, and a Superluminescent Diode provides that with a broad, smooth spectral output and relatively low temporal coherence. This combines LED-like broadband emission with higher brightness and good fiber coupling, giving short coherence length without the high spatial coherence of a laser diode. That makes it a common and effective choice for OCT light sources. The other terms aren’t standard devices used in OCT naming—scattered laser diode, solid-state laser diode, and superluminal diode don’t describe the broadband, low-coherence source that OCT relies on.