Flat Fused Quartz Optical Window

K9 optical window
  • Fused quartz is a glassy form of quartz, so it is isotropic. Fused quartz is tough and hard, with a very low expansion rate.
    Common types of fused silica contain water, which has a strong absorption of infrared rays. Anhydrous fused silica varieties are available for use as infrared.
    The optical properties of quartz glass are unique. It can transmit both far ultraviolet spectrum and visible light and near infrared spectrum.
    Users can choose the required variety from the 185-3500nm band according to their needs.

  • Because quartz glass is resistant to high temperatures, has a very small thermal expansion coefficient, and has good chemical thermal stability, bubbles, streaks, uniformity, and birefringence are comparable to those of general optical glass, so it is an indispensable optical material for optical systems with high stability working in various harsh occasions.
Technical parameters
Items Parameters
Material UV fused quartz (JGS1, Corning 7980), infrared fused quartz (jgs3, Corning 7978)
Diameter 3mm-500mm ± 0.1mm
Center thickness tolerance ± 0.05mm (we can process to ± 0.01mm with high precision)
Center deviation 3′(we can process to 30 ″with high precision)
Surface accuracy λ/ 8 (high precision, we can process to 1 / 30λ)
Surface quality 40/20 (we can process to 10-5 with high precision)
Effective caliber ≥90%
Coating UV AR Coating 250-400nm or according to the custom requirements
spectral curve
quartz window
quartz flat window

Physical and Chemical Properties of Fused Silica

Density (g/cm3) 2.201
Melting point (℃) 1600
Dielectric constant 3.7@20 °C: 0 ...106 Hz
Thermal expansion coefficient (1/℃) 5.1 × 10 ^–7@0 ...100 °C
Elastic modulus (20°C, MPa) 7.25 x 10^4
Compressive strength (estimated) (MPa) 1150
Tensile strength (estimated) (MPa) 50
Flexural strength (estimated) (MPa) 67
Knoop hardness(MPa) 5800...6200
Moh's hardness 5.5 -6.5
Poisson's ratio 0.17
Torsional elastic modulus (MPa) 3.0 x 10^4

Commonly used quartz grades and corresponding bands

Wavelength range Brand and type
185 nm - 2500nm JGS1 Far UV Optical Quartz
220nm - 2500nm JGS2 UV Optical Quartz
260 nm -3500nm JGS3 Infrared Optical Quartz
185nm - 2100nm Corning 7980 UV Quartz
300 nm - 3500nm Corning 7979 Infrared Quartz
250nm-2500nm GE-124 UV Quartz

Window Materials Quick Guide

Wavelength range Window material
180 nm - 8.0 μm Calcium Fluoride CaF2
185 nm - 2.1 μm UV Fused Silica
200 nm - 5.0 μm sapphire
200 nm - 6.0 μm Magnesium fluoride MgF2
600 nm - 16 µm Zinc Selenide ZnSe
1.9 - 16 μm Germanium single crystal Ge
2 - 5 μm Barium fluoride BaF2

Types of quartz products that can be processed

Plane window4

Quartz optical window

Quartz optical windows are generally required to have very excellent flatness and smoothness. Our quartz optical windows can meet the surface requirements of 1/30λ and above, and the smoothness can reach level 1. In addition, the coated window adopts single-sided or double-sided coating to increase the transmittance of a specific band to 99.8%; cut-off film can also be coated for a specific band. For the needs of strong lasers, high threshold coating can be provided, and through the optimized design of materials and film systems, it can meet the use of strong lasers.

Plano convex lens1

Quartz lens series

The quartz lens series includes six forms as shown in the left figure. According to customer needs, the substrate can be selected from domestic fused quartz (JGS1, JGS2) and Corning 7980/7979 series, or other materials can be specified.

Optical antireflection film

Quartz Aspheric Lenses

A spherical lens has a constant curvature from the center to the edge of the lens, while an aspherical lens has a curvature that changes continuously from the center to the edge. In a photographic lens, many "aberrations" must be corrected to ensure optical performance. If only spherical lenses are used for correction, many lens combinations are required to meet the technical requirements of the corresponding lenses. For special advanced lenses, spherical lenses alone sometimes cannot correct aberrations to a level that satisfies the user. Aspherical lenses, whose radius of curvature changes with the central axis, are used to improve optical quality, reduce optical components, and lower design costs. Aspherical lenses have unique advantages over spherical lenses, and therefore have been widely used in optical instruments, imaging, and optoelectronics industries.

Right Angle Prism1 2

Quartz prisms

Prism, a transparent object surrounded by two intersecting but non-parallel planes, is used to split light or disperse light beams. It is widely used in optical instruments. Prisms can be divided into several types according to their properties and uses. For example, in spectral instruments, the "dispersion prism" that decomposes composite light into a spectrum is more commonly an equilateral prism; in instruments such as periscopes and binoculars, the "total reflection prism" that changes the direction of light and adjusts its imaging position is generally a right-angle prism.

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