H-K9L crystal is also called H-K9L glass, which can also refer to glass products made of H-K9L material, which are used in optical coating and other fields. The light transmittance, refraction effect, hardness and texture are much higher than those of resin materials.

Schott Sapphire, as one of the hardest, most durable and scratch resistant materials, offers a broad transmission range from UV to mid infrared wavelengths (250 - 5000 nm). The material is able to withstand extreme environmental conditions and temperature changes. SCHOTT offers sapphire materials, Raytek offers the machining process in different supply forms, dimensions, and in customized processing stages.

N-BK7 is designed and manufactured by Schott in Germany for a wide range of visible and short-wave infrared applications.

With more than 130 years of experience in the field of glass and optical technology, Schott's optical glass products play an important role in numerous industries worldwide
"N"-glass as an environmentally friendly alternative to conventional lead and arsenic-containing glass types.

Heraeus Suprasil 300 is a fully synthetic fused silica, OH free.
Suprasil 030 / 300 is designed for highest purity lamp applications. The tube is fabricated using the unique Heraeus multi-step process (S-ZUG).

Schott optical glass, sapphire, N-BK7 optical glass, Ohara optical glass.