They most commonly emit light at 473 nm, which is produced by frequency doubling of 946 nm laser radiation from a diode-pumped Nd:YAG or Nd:YVO4 crystal. A blue laser emits electromagnetic radiation with a wavelength between 400 and 500 nanometers, which the human eye sees in the visible spectrum as blue or violet. Blue lasers can be produced by: Lasers emitting wavelengths below 445 nm appear violet, but are nonetheless also called blue lasers. They are commonly used in various applications such as telecommunications, data storage, and medical procedures. The wavelength of a blue laser refers to the distance between two peaks or two troughs of the light wave. Understanding these differences helps engineers.
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