Introduction
In many laser systems and optical devices, optical windows are small but essential components. They protect the inner parts of the system while allowing light to pass through.
1. What is an Optical Window?
An optical window is a flat piece of transparent material. It is used to separate the environment from the inside of the optical system, without changing the direction of the light.
It allows light to pass, but blocks dust, moisture, and other contaminants.
2. Common Materials
Different materials are used depending on the application:
– BK7 (or H-K9L): For visible to near-infrared light. Low cost.
– Fused Silica: High thermal resistance. For high-power lasers.
– Sapphire: Very hard. Good for harsh environments.
– Calcium Fluoride (CaF₂), Germanium (Ge): For UV or IR applications.
3. Where Is It Used in Laser Systems?
Optical windows are used in many laser applications:
– Laser Cutting and Welding: Protect focusing lens from damage.
– Laser Marking Machines: Block smoke or dust from entering optics.
– Scientific Instruments: Maintain clean optical paths in vacuum or sealed chambers.
4. What to Consider When Choosing a Window
When selecting an optical window, consider the following:
– Size and Thickness
– Surface Quality (e.g., 60/40 or 40/20)
– Flatness (e.g., λ/2, λ/10)
– Transmission Wavelength Range
– Laser Damage Resistance (LIDT)
5. Summary
An optical window may look simple, but it plays an important role in keeping your optical system clean and functional. Choosing the right window can extend equipment life and improve performance.
If you’re looking for standard or custom optical windows, feel free to contact us.
Bonus: FAQ
Q: Can optical windows be custom-made?
A: Yes. We support custom size, shape, and coating.
Q: Which material is best for high-power lasers?
A: Fused silica or sapphire is recommended.