N-BK7 Windows

Product Overview:

N-BK7 windows are renowned for their exceptional optical properties, including a high refractive index of around 1.5168 at 587.6nm, low dispersion with an Abbe number of approximately 64.2, and a wide transmission range from 350nm to 2500nm. These features ensure minimal chromatic aberration and efficient light transmission across the visible and near-infrared spectra. The material is highly homogeneous, providing consistent performance throughout the window. It also offers good mechanical strength and chemical stability, making it durable and resistant to environmental factors. N-BK7 windows are precision polished to achieve low surface roughness, minimizing light scattering and distortion. They can be further enhanced with anti-reflective coatings to maximize transmission efficiency.

Features:

1. Optical Properties

• High Refractive Index: N-BK7 has a relatively high refrractive index of around 1.5168 (at a wavelength of 587.6 nm), which allows for efficient light transmission and minimal reflection losses, making it suitable for a wide range of optical applications.

• Low Dispersion: Its Abbe number is about 64.2, indicating low dispersion. This means that it causes minimal chromatic aberration when light passes through, ensuring that different wavelengths of light are focused close together, which is crucial for maintaining image quality in optical systems such as cameras, microscopes, and telescopes.

• Wide Transmission Range: N-BK7 windows have good transmission characteristics across the visible spectrum and into the near-infrared region. They can transmit light efficiently from approximately 350 nm to 2500 nm, which covers most of the wavelengths used in common optical applications.

2. Physical Properties

• High Homogeneity: The material is highly homogeneous, meaning that its optical properties are consistent throughout the bulk of the glass. This uniformity ensures that the performance of the window is stable and predictable, regardless of where the light passes through the window.

• Good Mechanical Strength: N-BK7 windows have sufficient mechanical strength to withstand the rigors of handling and installation in various optical setups. They can endure moderate levels of mechanical stress without breaking or deforming, which is important for maintaining their optical integrity.

• Chemical Stability: They are chemically stable and resistant to many common environmental factors. This means that they can be used in a variety of different environments without being easily corroded or degraded by exposure to air, moisture, or other substances.

3. Surface Quality

• Precision Polishing: The windows are typically precision polished to very high standards, with surface roughness values that are extremely low. This ensures that the surfaces are smooth and flat, minimizing scattering and distortion of light as it passes through the window.

• Coating Options: N-BK7 windows can be coated with various anti-reflective coatings to further enhance their performance. These coatings can reduce reflection losses even more, improving the overall transmission efficiency of the window and allowing it to be used in applications where maximum light throughput is critical.

Applications:

1. Imaging Systems

• Cameras: N-BK7 windows are used in cameras to ensure high-quality image capture. Their high optical transmission and low dispersion properties help in minimizing chromatic aberration, ensuring clear and sharp images.

• Microscopes: These windows are crucial in microscopes, where precise light transmission and minimal optical distortion are essential for accurate imaging.

• Telescopes: N-BK7 windows are also used in telescopes to provide clear and undistorted views of celestial objects.

2. Laser Systems

• Laser Optics: N-BK7 windows are commonly used in laser systems to protect sensitive optical components while allowing efficient laser beam transmission. Their high optical transmission and low dispersion properties make them ideal for precision laser applications.

3. Scientific Instruments

• Spectrometers: N-BK7 windows are used in spectrometers and other analytical instruments where optical clarity and durability are essential.

• Interferometers: These windows are also used in interferometers to provide a clear optical path while protecting the internal components from dust, moisture, and other contaminants.

4. Medical Devices

• Endoscopes: N-BK7 windows play a crucial role in medical devices such as endoscopes, where they help in transmitting light while ensuring the sterility and integrity of the device.

• Surgical Lasers: These windows are also used in surgical lasers to protect sensitive components and ensure efficient light transmission.

5. Industrial Applications

• Metrology Equipment: N-BK7 windows are used in metrology equipment and other devices that require precision optical components.

• Sensors: In sensor applications, N-BK7 windows can be used to transmit light to and from the sensing element, while protecting it from external conditions that could affect its performance.

6. Other Applications

• Projectors: N-BK7 windows are used in projectors to ensure high-quality image projection.

• Optical Instruments: These windows are also used in various optical instruments where precise light transmission and minimal distortion are required.

Specifications with Customized: