As their name suggests, filters are intended to transmit the desired wavelengths alone by reflection or absorption while blocking the unwanted wavelengths. There is a demand for general accuracy and consistently high quality as the market for advanced technologies in filters expands. Custom filters are used in many industries to provide the best results for the application.
Alfa Chemistry can provide a custom precision filter service, producing entirely customized filters in accordance with detailed customer requirements. Each filter is distinct, ensuring that each filter is produced to meet the requirements of a particular application and client. Optical coatings are used in custom filters to choose and control a particular spectrum of light, transmitting or attenuating it as required. Some of the most common applications include fluorescence microscopy, spectroscopy, clinical chemistry, and sensors and detectors.
Our Capabilities
Alfa Chemistry provides bandpass, edge, and color filters in the ultraviolet (UV), visible (VIS), near infrared (NIR), and shortwave infrared (SWIR) wavelength ranges. These filters are available in a variety of sizes and shapes. We provide filters made from the following substrate materials: optical glass, color filter glass, and fused silica. If you do not see the material you need, get in touch with us to talk about your choices.
| Types Available | Interference, Colour glass, Dichroic, Polyester, Neutral Density |
| Diameter / Thickness / Length / Width | Material dependent |
| Diameter Tolerance | ± 0.1 mm |
| Thickness Tolerance | ± 0.01 mm |
| Bandwidth | 3nm ~ 100nm |
| Wavelengths | 175 ~ 3200nm |
| Peak transmission | > 85% |
| Blocking | < OD4 |
| Surface Quality | < 60/40 |
Our objective is to satisfy our clients' expectations in terms of performance and pricing. Choosing the kind, size, and shape of the filter you require is frequently all that is required as part of our customizing process. We can also meet any more difficult technical specifications, including tunable filters for certain purposes. Optically related factors such complete cone angle, angle of incidence, and polarization state are taken into account by particular filters. Each setting has an impact on how the light behaves as it passes through the filter. In turn, criteria including the bespoke filter's breadth and height, thickness, substrate type, and light-through aperture must be carefully taken into account.
It is advised against using uncommon or more expensive materials unless absolutely necessary in order to cut costs and lead times. Most of the time, the type of application for which the custom filter will be utilized will determine all of the aforementioned criteria.
The Right Filters
Filters are classified by their construction, which determines the way they filter light. There are many types of absorption and reflection filters, and they should be carefully selected based on the specific application in which they will be used. Wavelength range, cutoff characteristics, angle of incidence (AOI), energy, and operating environment should all be taken into account when choosing a filter for a certain application.
Careful evaluation of your requirements is essential regardless of whether your application calls for a dichroic, absorption, or neutral density filter. To reduce production time and, consequently, cost, it is essential to choose the appropriate filter for your application.
If you need technical advice, please contact our technical team to learn more about our high-quality services.