The development of free-electron-based light sources has long been a subject of widespread interest owing to the fact that the wavelength of generated light can be tuned continuously from the long-wavelength range (microwaves and infrared) to the visible range and all the way to the short-wavelength range (ultraviolet and X-rays). However, the disadvantage of such a light source is its large size and high cost.
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Thailand has enjoyed a unique position as the world’s major ruby export and ruby enhancement hub. Revenue from gemology industry has continued to grow albeit a general decline in economy. Currently it is second only to the automobile industry in terms of GDP. Thai rubies, also known as “Tubtim Siam,” are known for their vibrant blood-red color and are the benchmark of high-quality rubies.
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