A spherical lens is a spherical lens, which is commonly used in scene such as fiber couplers, endoscopes or bar code scanners.
For spherical lenses, it has two focal length concepts, one is the conventional focal length EFL, and the other is the back focal length BFL
BFL = EFL - D / 2
EFL = n * D / [4 * (n - 1)]
n stands for Refractive index of material,For example, water is 1.33, crystal is 1.55, diamond is 2.42, heavy flint glass is 1.65, and K9 glass is 1.5163.
Material:H-K9L,Sapphire, Ruby, JGS1 JGS2 JGS3 ,Single-crystal Silicon,Aluminum oxide,TAFD40, ZnS etc optical glass accordingly customers design
Types:Ball Lens, Half Ball Lens
Diameter Tolerance:+/-0.005mm
Sphericity:+/-0.001mm
Surface Accuracy:lambda/4@632.8nm
Surface Quality:40/20
Coating:upon customers demand
In addition to refractive index, the main reference for optical glass classification is Abbe number. The Abbe number is a physical quantity invented by German physicist Ernst Abbe, also known as the "dispersion coefficient", to measure the degree of light dispersion in transparent media.
Generally speaking, the larger the refractive index of the medium, the more serious the dispersion and the smaller the Abbe number; Conversely, the smaller the refractive index of the medium, the slighter the dispersion, and the larger the Abbe number.
Domestic e-commerce platforms have a large number of "glass balls" or even "crystal balls" on sale, their size is rich, the price is low, even the nominal price of high-precision glass balls, are also thousands of pieces.If you search for "optical glass ball" or "optical ball lens", then the price will be much more expensive.
This is because both materials and processing technology, there are huge differences. General ordinary glass balls may be batch hot casting or hot melt circular processing, there may be a large number of bubbles and impurities inside the material, and the ellipsoid of the molding is not too high.
However, optical glass materials are mostly crystals and cannot be hot melted. Optical ball lenses of this kind, generally can only be cold processing grinding. Moreover, in the early stage, there will be certain requirements for the type of material, the purity and uniformity of the material, and the surface finish, ellipsoid and profile accuracy in the later stage.
So, naturally, the overall cost will be high.
Ordinary choice of ball lens requirements are not high can choose H-K9L, a wide variety of sizes, Large inventory selection.
A better option is a high-index spherical lens, which has better optical properties and a higher price.
In a word, CCRQ have many stock size ball lens and half ball lens for samples testing,