H-K9L Glass Chinese Equivalent BK7 Wafers

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H-K9L Glass Wafers

When developing optics that are used in extreme environments, it is important to recognize that the optical glass will have a high refractive index and high density of glass, such as the H-K9L. With a lens with this diameter, the densities of the glass become crucial for weight-sensitive applications and help determine the weight of an optical assembly. [Sources: 0]

H-K9L is an excellent less expensive alternative BK7 glass.

H-K9L is a great subsitute for fused silica when extremely hard glass is not required. H-K9L benefits includes:

  • low refractive index
  • low dispersion
  • excellent transmittance through-out the visible and near infrared spectra

Please let us know what specs we can quote for you!

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In applications with extreme temperatures and rapid temperature differences, the expansion coefficient of the glass becomes a key factor. The requirements of optical systems for different applications are covered by so many factors that they cannot be met with just a small number of types of glass. Edmund Optics (r) offers a list of eyewear types that can be selected based on the following properties. [Sources: 0]

Spherical aberrations are less present because light travels faster in materials with a lower refractive index. High-index refractions bend light so there is less need for curvature of the lens. [Sources: 0]

Geometric and colored induced aberrations can be compensated by using a wide-angle lens with a high refractive index, such as the H-K9L. [Sources: 0]

Designers typically use the refractive index (Abbe number) of the glass as a degree of freedom when designing systems. The refractive index is a measure of how light interacts with the specified material and slows down when it passes through the optical material. [Sources: 0]

This is determined by the Abbe number (v / d), which is defined as where F / C d is. + 1 (F - C). The x-axis is in the opposite direction, with the number on the left increasing (the number of increases). Fig. 50, and the line starts from bottom to top (starting with number 55) and continues from top to top (Fig. 1). [Sources: 0]

Many glass manufacturers offer the same material properties under different trade names, but most modify the products and processes to be ECO-friendly (lead and arsenic-free), and most of them are "ECO-friendly" or "lead-free" (arsenic-free). The lead letters in the glass names indicate the important chemical elements used in each type of glass. There are large lines that separate different types of glass, such as lead, arsenic, lead - free and free - lead. The deviation is due to the different chemical composition of the different types of glass and their chemical properties. [Sources: 0]

The Abbe diagram, first introduced by SCHOTT in 1923, is a long-established survey of the refractive index of optical glass (d). It indicates the difference between the optical properties of different types of glass in terms of their refractory properties. [Sources: 0]

What are H-K9L Wafers?

H-K9L are the Chinese equivalent of BK7 glass wafers. The specs are nearly the same, but the price for H-K9L windows is much more affordable for researchers and industry.

Please send us your specs and quantity for an immediate quote.

Below are just some of the H-K9L specs that we carry.

Diam 25.4mm, 1000 um thick, DSP
Flatness: better than 1 lambda


Dia 100mm, 1,000 um thick, DSP
TTV < 1um
Roughness <1nm
Parallelism <1 arcsec


H-K9L Glass Wafers
150mm 675um



20x20x1.0mm, DSP


H-K9L Materials Property

h-k9l materials properties