Dating steuben glass
Neodymium compounds were first commercially used as glass dyes in 1927, and they remain a popular additive in glasses.The color of neodymium compounds—due to the Nd ion—is often a reddish-purple but it changes with the type of lighting, due to the interaction of the sharp light absorption bands of neodymium with ambient light enriched with the sharp visible emission bands of mercury, trivalent europium or terbium.Some neodymium-doped glasses are also used in lasers that emit infrared with wavelengths between 10 nanometers.The evolving technology, and improved purity of commercially available neodymium oxide, was reflected in the appearance of neodymium glass that resides in collections today.
Early neodymium glasses made in the 1930s have a more reddish or orange tinge than modern versions which are more cleanly purple, due to the difficulties in removing the last traces of praseodymium in the era when manufacturing relied upon fractional crystallization technology.
This laser usually emits infrared at a wavelength of about 1064 nanometers.
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