1. In a strict sense, the visible Spectrum nominally covering the Wavelength Range of 400 NM to 750 nm. 2. In the Laser and optical communications fields, the much broader portion of the electromagnetic spectrum that can be handled by the basic optical techniques used for the visible spectrum extending from the near-ultraviolet region of approximately 0.3 micrometers through the visible region and into the mid-infrared region to 30 micrometers.

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