Features
This is an interference filter that uses the interference of reflected light generated at the interface of a thin film. It can transmit a desired specific wavelength selectively.
Soft coatings deteriorate easily in environments of high temperature or high humidity. Depending on the environment of use and the application, we would suggest a hard coated band-pass filter with excellent durability.
The company handles MIF (metal interference filters) and DIF (all-dielectric interference filters).
The standard characteristics are listed in the following table.
This filter consists of a combination of several filters as shown below to widen the inhibition band. In the case of soft coated band-pass filters, the LPF is usually colored glass. It is possible to inhibit ultraviolet to visible light with the absorption of colored glass.
For MIF and DIF, the inhibition band is set as standard, but it can be extended further. On the other hand, hard coated band-pass filters can be used with a single substrate.
MIF（metal interference filters）
This filter has a three-layer structure of semitransparent metal film, transparent dielectric film and semitransparent metal film formed on a glass or quartz plate with a glass or quartz plate bonded on top. When the optical interval of these two metal films is half or an integer multiple of a specific wavelength, the filter passes mostly light of that wavelength and blocks almost all light of other wavelengths. There are S and W types of metal interference filter depending on the degree of cut-off of the passed band.
MIF-S type
| Available wavelength range [nm] |
Maximum Transmittance[%] |
Half-width[nm] |
Center wavelength Tolerance [nm] |
Standard dimensions [mm] |
| Diameter |
Square |
| 376-405 |
25-45 |
≦18 |
±3 |
15、20、
30、40、
50 |
50×50 |
| 406-475 |
30-45 |
≦13 |
±3 |
| 476-705 |
30-47 |
≦13 |
±3 |
| 706-955 |
30-45 |
≦20 |
±4 |
| 956-1195 |
28-45 |
≦35 |
±4 |
| 1196-1500 |
28-45 |
≦40 |
±5 |