TianCheng Optics CO., Ltd.
TianCheng Optics CO., Ltd.
  • float glass optical windows
  • optical window in optical fiber communication

Float Window

While floating through the molten tin, the combination of gravity and surface tension results in smooth and flat surfaces on both sides. 

a) Smooth and flat surface and good vision.

b) Excellent optical performance.

c) Stable chemical properties.

d) Resistant to acid, alkaline, and corrosion.

  • float glass optical windows
  • optical window in optical fiber communication

Specification of Float Window

Optical windows are an essential component of many optical systems, including lasers, cameras, telescopes, and microscopes. They allow light to enter or exit an optical system while providing a barrier to dust, moisture, and other contaminants. There are various types of optical window in optical fiber communication available, including sapphire, quartz, and borosilicate glass, custom optical windows are also supported.


Float Glass


1 to 500 mm

Diameter Tolerance

+0/-0.02 mm

Thickness Tolerance

±0.01 mm

Surface Quality


Surface Figure



1 Minute


Uncoated, AR, HR, Beamsplitter, etc.

Types of optical window glass for your needs:

Advantages of Float Glass Optical Windows

Float glass optical windows offer several advantages that make them highly advantageous for various applications. Here are some key advantages of float glass optical windows:

  • High Optical Clarity: Float glass optical windows have excellent optical properties, providing high transmission of light across a wide range of wavelengths. They offer minimal distortion, allowing for accurate and clear imaging, making them suitable for applications in optics, imaging, and display technologies.

  • Smooth and Flat Surfaces: Float glass manufacturing process ensures that the windows have smooth and flat surfaces, free from distortions or imperfections. This enables precise light transmission and minimizes scattering or aberrations, making them ideal for applications that demand high optical quality.

  • Mechanical Strength and Durability: Float glass optical windows exhibit mechanical strength and durability. They can withstand mechanical shocks, thermal stress, and environmental factors, making them suitable for use in challenging industrial and outdoor environments.

  • Cost-Effective: Float glass manufacturing is a highly efficient and cost-effective process, allowing for large-scale production of optical windows at a relatively low cost. This makes float glass optical windows a cost-effective solution compared to other types of optical materials.

  • Versatility: Float glass optical windows are highly versatile and can be customized in terms of size, shape, and thickness to meet specific application requirements. They can also be easily integrated into different optical systems and setups.

  • Easy Handling and Processing: Float glass optical windows are easy to handle and process due to their flat and uniform surfaces. They can be easily cut, shaped, and polished according to specific needs, simplifying the fabrication process.

Overall, the advantages of float glass optical windows make them a popular choice for a wide range of applications in industries such as optics, imaging, displays, lasers, and industrial systems.

Applications and Selection Criteria of Float Glass Optical Windows

Float glass optical windows, made from high-quality, flat glass, have a wide range of applications in various industries. Here are some common applications and selection criteria for float glass optical windows:

  • Optics and Imaging: Float glass optical windows are used in optics and imaging systems, such as cameras, telescopes, microscopes, and spectroscopy devices. They provide a clear and smooth surface for optical transmission, allowing for accurate imaging and light transmission.

  • Display Technology: Float glass optical windows are used in electronic displays, LCD screens, and touchscreens. They provide a protective cover, allowing for optimal viewing and touchscreen functionality while maintaining durability and scratch resistance.

  • Laser Technology: Float glass optical windows are utilized in laser systems and applications. They help in shaping and directing laser beams, providing transmission of specific wavelengths, and offering thermal insulation.

  • Industrial Applications: Float glass optical windows find application in various industrial settings, such as machine vision systems, barcode scanners, inspection equipment, and laser processing systems. They provide robustness, optical clarity, and resistance to environmental factors.

Selection criteria for float glass optical windows include:

- Optical Transmission: Optical windows need to have high optical transparency and low absorption to ensure minimal loss of light during transmission.

- Surface Quality: The surface quality of the window should be smooth and free from defects, scratches, or blemishes to prevent distortion or interference with optical clarity.

- Mechanical Durability: Float glass optical windows should have mechanical strength and resistance to abrasion, impact, and thermal stress to withstand harsh environments and handling.

- Chemical Resistance: Depending on the application, resistance to chemical exposure or corrosion may be necessary.

- Size and Thickness: The size and thickness of the window should be chosen based on the specific optical requirements and structural constraints.

Consideration of these selection criteria ensures that float glass optical windows are chosen appropriately for their intended applications, resulting in optimal performance and durability.

Float Glass Optical Windows Manufacturing Process

Float glass optical windows are manufactured using the following process:

  1. Raw materials, including silica sand, soda ash, limestone, and dolomite, are mixed and melted in a furnace at a temperature of around 1500°C.

  2. The molten glass is then poured onto a bed of molten tin, forming a uniform layer of glass that is cooled gradually.

  3. The cooled glass is then cut into the required sizes and shapes using diamond-tipped tools.

  4. The optical windows are then polished to achieve the required surface quality.

Cleaning and Maintenance of Float Glass Optical Windows

Float glass optical windows require proper cleaning and maintenance to ensure their long-term performance. Here are some tips for cleaning and maintaining float glass optical windows:


  1. Use a soft, lint-free cloth or a microfiber cloth to clean the optical window. Avoid using paper towels or abrasive materials, as they can scratch the surface of the window.

  2. Apply a small amount of a gentle cleaning solution, such as isopropyl alcohol or lens cleaning solution, to the cloth.

  3. Gently wipe the surface of the optical window in a circular motion, starting from the center and moving towards the edges.

  4. Use a dry cloth to remove any remaining cleaning solution.


  1. Store the optical windows in a clean, dry environment to avoid contamination and damage.

  2. Inspect the optical windows regularly for any signs of damage or wear, such as scratches or cracks.

  3. Handle the optical windows with care, using gloves or other protective equipment to avoid fingerprints or smudges.

  4. Avoid exposing the optical windows to extreme temperatures or humidity, as this can affect their optical properties.

Contact Us

If you would like to build your own precision optical products or request a quote, please click one of the two buttons below. Otherwise, please fill out the form below with any questions or concerns.

TianCheng Optics CO., Ltd.
Tian Cheng Optics CO.,Ltd
  • Address

    No. 1567 Liu Ying Lu, Kuan Cheng District, Chang Chun, P.R. China

  • Call Us


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