BK7 Glass Window K9 Window For Laser Scanning System

The BK7 glass window K9 window is an optical glass commonly used to make transparent windows and lenses. It is a borosilicate crown glass that combines visual, chemical, and mechanical properties for basic visible wavelength optics. It is an excellent basic glass for standard visible wavelength applications where its combination of valuable properties and low cost provides significant advantages over more advanced materials.

 

With high-volume production of precision BK7 glass K9 glass, we can offer high-quality windows and viewpoints at a price far below comparable optics. It is vividly clear, allowing bright, crisp imaging or beam viewing, which shows an excellent transmission rate. Besides, our windows are built to last in demanding conditions, withstanding exposure to most solvents, reagents, and water without damage or fogging. More importantly, low cost, high volume. We produce BK7 windows K9 windows in various popular sizes for laser enclosures and vacuum viewpoints, microscope slides and slips, lighting fixtures, and other basic optics needs. Our high production volumes lead to the industry's lowest prices on BK7 windows with small minimum orders.

 

BK7 windows from our company represent the most cost-effective solution for applications requiring visible transparency, stability, durability, and laser/ heat resistance. Nothing beats our high-quality, low-cost BK7 windows when price and performance are equally critical. Don't hesitate to contact us today to get the perfect BK7 windows for your needs!

 

Features

- High visible light transmission

- Uniform refractive index

- Low bubbles/inclusion

- Smooth, parallel surfaces

- Dimensional stability

- Resists scratching/ breakage

- Properly cut and sized

 

Parameters

Product name	BK7 Glass Window/ K9 Window
Visible transmission	≥ 90-92%
Surface quality	≤λ/10 scratch-dig
Parallelism	≤ 5 arcmin
Coating	AR, BBAR or custom
Cutting/ Sizing	±0.2mm size tolerance
Hardness	~5 Mohs

 

Spectrum Transmission Curve

 

Application

Any application involving transmission, manipulation, or imaging of visible light, especially at high volumes or where cost is a concern, is a potential use for BK7 glass windows or other K9 optics. Their properties and affordability provide significant benefits for basic visible wavelength systems and some near-UV and heat/chemically challenging uses where more exotic glasses would add unnecessary expense. Their versatility has enabled BK7 windows to find roles in fields from laser technology to medicine.

- Lenses

- Microscope slides

- Fiber optics

- Optical flats

- Beamsplitters

- Laser applications

 

What is the optical window in a laser?

An optical window is a transparent component used in lasers to allow light to pass through while containing the laser medium or apparatus. Some key points about optical windows in lasers:

 

They are made of materials transparent to the specific wavelengths of light in the laser, such as UV-grade fused silica for excimer lasers or IR-grade ZnSe for CO2 lasers. Materials like BK7, K9, fused silica, or sapphire are often used for visible laser wavelengths.

 

The window must have a high damage threshold to withstand the high-intensity laser beam without fracturing or distorting. This typically requires a high-quality, dense, and defect-free material. Coatings are also sometimes applied to increase the damage threshold.

 

The window must be securely mounted to the laser cavity to contain the laser medium while allowing the beam to pass through unattenuated. A proper mount and seal is required, especially for gas laser mediums.

 

Its optical properties must preserve the quality of the laser beam. This means minimal reflection, scattering, or absorbing of light, with highly parallel and polished window surfaces to avoid distorting the laser mode.

 

For pulsed lasers, the window should have minimal nonlinear effects that could interfere with laser performance, like generating additional wavelengths through frequency doubling or parametric generation. This requires a carefully chosen material and thickness.

 

The window must withstand any thermal effects generated by the laser with minimal mechanical or optical distortion, like a BK7 glass window. Some laser mediums require cooling of the optical windows to prevent overheating.

 

The material should be chemically compatible with the laser medium, especially in the case of reactive metal vapor or gas mediums. It must not degrade or off-gas under exposure to the medium.

 

Anti-reflection coatings are often applied to reduce the optical windows' reflection losses, increasing the laser's efficiency. Single-layer or multi-layer coatings can provide maximum transmission over a specific wavelength range.

 

For ultrafast pulsed lasers in the femtosecond domain, the material should have suitable dispersion properties to minimize pulse broadening as the beam passes through the window. Fused silica is often used for its anomalous dispersion in these applications.

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