Rare earth element optical glass
In the 1930s, new rare earth element optical glasses appeared, the main components of which were oxides of lanthanum, cerium and lanthanum. Rare earth element optical glass has a high refractive index, opening up new possibilities for the design of optical lenses. Today, there are many enamel glasses in the large aperture lens. The bismuth glass has stopped production due to its radioactivity. Lead-free optical glass.
Lead-free optical glass does not contain lead or arsenic and is marked with N.
Optical glass classification
Glass with similar chemical composition and optical properties is also distributed in adjacent positions on Abbe. Abbott of SCHOTT Glass Factory has a set of straight lines and curves. It divides Abbey into many areas and classifies optical glass. Columns such as enamel glass K5, K7, K10 in K area, ochre glass F2, F4, F5 in F Area. Symbol in the glass name:
F stands for meteorite
K stands for the card
B represents boron
BA representative é’¡
LA stands for 镧
N stands for lead-free
P stands for phosphorus
Physical parameters of optical glass
Vd Abbe number four significant figures
Nd refractive index seven significant figures
Ve four significant figures
Ne seven significant figures
Density of glass. Four significant figures
Glass transparency. Four significant figures
Three significant figures of the coefficient of refractive index change with temperature
International glass code
The international glass code is represented by nine digits in the form: xxxxxx.xxx;
The first three digits represent the first three digits after the decimal point of the refractive index nd.
The next three digits represent the three digits of the Abbe number Vd, excluding the decimal point.
The three digits after the decimal point represent the density of the glass, excluding the decimal point
Such as K10 glass
Nd=1.50137 The first three digits after the decimal point = 501
Vd=56.41 first three digits, excluding the decimal point = 564
Density = 2.52; excluding the decimal point = 252
K10's international glass code is 501564.252
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