Optical glass (i-line glass)

Optical glass is a kind of glass which is used in optical parts such as lens and prism and has property of optical homogeneousness compared to other kind of glass.

The following are some example of required properties of optical glass.
　(1) Optical transparency
　(2) Homogeneousness, Isotropy
　(3) No bubbles, striaes, strains
　(4) Given optical constant, little temperature
　　　 dependence
　(5) mechanical strength
　(6) High weathering proof.

One of the properties of optical glass is to have many kinds. It is divided broadly into crown glass
(≧55νd) and flint glass (≦ 50νd) according to its' flexibility (nd) and abbe number (νd).

We offer custom-ordered optical glass with high homogeneous and optical transparency and excellent solarization such as i-line optical glass in addition to regular optical glass (ecology, Rb and As free) .

Examples of material of optical glass

Name	Index of refraction ／ Dispersion	Property	Usage
NIGS5960	ni:1.616／νd:59.6	99.7% of optical transmission in 365nm High homogeneousness Δn@633nm = 1×10-6	Near UV high-through glass
NIGSE5083	nd:1.498／νd:82.5	Achromatic doublet by high depression	Achromatic glass
NIGSE5165	ni:1.531／νd:65.0	�@365nm UV exposure induced- 　suppression of degreased transparency �AAspheric surface process with mold �Baresevic and plumbum free	Near UV high-resistance glass