Photochromatic Interval

The photochromatic interval is the interval between sections of the white light spectrum, the transmission of which varies depending on the intensity of ultraviolet radiation and differs from the transmission of the black and gray intervals. It separates these last two intervals and characterizes the degree of photosensitivity of the object. In physics, photochromatic materials (photochromic polymers or photochromic glasses) are nonlinear optical materials that can