Ruby Wallpaper

驚人的紅寶石和翡翠圖片高清壁紙

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A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Ruby is considered one of the four precious stones, together with sapphire, emerald and diamond.

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Fun Facts : After absorbing short-wavelength light, there is an interval of time when the crystal lattice of ruby is in an excited state before fluorescence is actually emitted. If 694-nanometer photons pass through the crystal during that time, they can stimulate more fluorescence photons to be emitted in-phase with them, thus strengthening the intensity of that red light. By arranging mirrors or other means to pass emitted light repeatedly through the crystal, a ruby laser in this way produces a very high intensity of coherent red light.

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