Figure 1
From: Effects of pulsing of light on the dentinogenesis of dental pulp stem cells in vitro
An optical device that carries light energy to objects. (A) A schematic of the device which is composed of LEDs as a light source, and a reflector, a light-guider and a diffuser to make the exposure light uniform. (B) A photo of the LED source part, from where light travels through a light-guide and becomes uniform at some distance. (C) Photos of the device with increasing driving voltage. Samples were put within the marked area with dotted rectangle. The variance of light intensity within this area was under 3.9%. (D) LEDs irradiated only near infrared 810 nm light. (E) Applied voltage was modulated in the form of 1 Hz square waves with different duty cycles.
