Infrared Neutral Density Filters
Custom Solutions: Kingwin Optics offers custom infrared ND filters with metallic coatings on Germanium substrates. These filters are designed to provide even attenuation over a wide range of infrared wavelengths, making them suitable for a variety of applications in thermal imaging, spectroscopy, and laser systems.
Performance: The ND coatings are optimized for performance at 2.2 microns and can effectively attenuate light across wavelengths up to 15 microns. This broad coverage ensures versatility and high performance in diverse infrared applications.
Applications: Thermal Imaging, Spectroscopy, Laser Applications, etc.
An Infrared Neutral Density (ND) Filter is a specialized type of filter designed to attenuate the intensity of infrared light evenly across a specific portion of the IR spectrum. Unlike other filters that might selectively block certain wavelengths, an ND filter aims to reduce the overall light intensity without altering the relative spectral distribution.
Specifications:
| Substrates | Germanium |
| Diameter Range | Custom |
| Transmission | 10%, 20% or custom |
| Aperture BBAR Coating on back surface S2 | Optional |
| Dimension Tolerance | ±0.2mm |
| Clear Aperture | +/-0.2mm, 90% of the outside dimension |
| Surface Quality | 80/50 S/D |
| Flatness | 2-4 waves per 25mm |
| Parallelism | 3-5 arc minutes |
| Mechanical | Unmounted |
Characteristics and Applications:
- Uniform Attenuation: Infrared ND filters offer even attenuation of light, which is critical for applications requiring consistent reduction of light intensity without introducing spectral distortion.
- Metallic Coating: These filters typically use metallic coatings deposited on substrates. The combination of absorption and reflection from these coatings achieves the desired level of attenuation.
- Wide Spectral Range: Infrared ND filters are designed to cover a broad range of wavelengths in the IR spectrum. For example, Kingwin Optics’ ND filters can be optimized for wavelengths around 2.2 microns and can cover a range extending up to 15 microns.
- Custom Design: These filters can be customized to meet specific requirements in terms of optical density and spectral range. Kingwin Optics offers custom solutions tailored to various infrared applications.
Substrates and Coatings:
- Substrates: The choice of substrate material is crucial for the performance of the ND filter. Common materials include Germanium, which is often selected for its excellent transmission properties in the IR spectrum.
- Coatings: The optical densities of the ND filters are primarily determined by the metal alloy coatings applied to the substrate. These coatings are engineered to achieve precise attenuation levels and maintain spectral neutrality.
Applications:
- Thermal Imaging: Infrared ND filters are used in thermal imaging systems to manage the intensity of the IR radiation reaching the sensors, preventing saturation and ensuring accurate temperature measurements.
- Spectroscopy: These filters are also employed in infrared spectroscopy to control the light intensity, allowing for precise analysis of samples without overloading the detector.
- Laser Applications: In IR laser systems, ND filters help regulate the laser power, protecting sensitive components and enabling accurate control of the laser output.
Kingwin Optics’ Infrared ND Filters:
- Custom Solutions: Kingwin Optics offers custom infrared ND filters with metallic coatings on Germanium substrates. These filters are designed to provide even attenuation over a wide range of infrared wavelengths, making them suitable for a variety of applications in thermal imaging, spectroscopy, and laser systems.
- Performance: The ND coatings are optimized for performance at 2.2 microns and can effectively attenuate light across wavelengths up to 15 microns. This broad coverage ensures versatility and high performance in diverse infrared applications.
By providing tailored solutions and leveraging advanced coating technologies, Kingwin Optics ensures that their Infrared Neutral Density Filters meet the precise needs of their customers, delivering consistent and reliable performance in demanding IR applications.
