Doublet lenses are the most commonly used optical materials with mature manufacturing technology and complete varieties. Generally, doublet lenses can transmit colored light with wavelengths ranging from 0.35 to 2.5m, and light beyond this band will be strongly absorbed by cemented lenses.
There are many places where lenses are needed in production and life, but can you distinguish between doublet lenses and ordinary lenses? Now let's solve it together.
Ordinary glasses: They are obtained by melt undercooling, independent of the chemical composition and the curing temperature region. The mechanical properties of solids are due to the increase of viscosity, and the transition from liquid to glass state is reversible.
Doublet lenses are made of high purity oxides of silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium, barium, etc. mixed in a specific formula. Melt in white gold crucible at high temperature, stir evenly with ultrasonic wave and remove bubbles. Then the temperature is slowly lowered for a long time to avoid the internal stress of the glass block. After cooling, the glass must be measured by optical instruments to check whether the purity, transparency, uniformity, refractive index and dispersion are in conformity with specifications. Qualified glass blocks are heated and forged to form optical lens hair germs.
The main difference between doublet lenses and ordinary lenses is that cemented lenses have high transparency, high uniformity of physical and chemical properties, and specific and accurate optical constants. These performances can not be replaced by ordinary lenses.
Nowadays, with the rapid development of science and technology, the performance of lens made of new optical material resin is far superior to that of ordinary lens in terms of its optical performance, safety performance and protection against harmful rays.