Optical filters are used for changing the spectral properties of optical radiation. Each filter has its own boundaries and performance levels. Therefore it is very important to select the optical filter checking its wavelength, thermal expansion, chemical resistance and mechanical density to produce the expected results.
Optical filter selection depends on a multitude of factors including wavelength selection, shape and width of passband, blocking outside the passband, transmittance colour matching and long-term stability.
Filters are used for many applications in the field of microscopy, photometry, radiometry, imaging, instrumentation, display, CCD, astronomy, aerospace etc.
- Neutral density filters
- UV filters
- Infrared filters
- Dichroic filters
- Coloured glass filters
- Heat absorbing filters
Material: filter glass, optical glass
Dimension: 3 – 320 mm
Dimension tolerances: up to +/- 0.02 mm
Parallelism: up to +/- 1 arc sec
Flatness: up to λ/10 (P-V)
Surface irregularity: up to λ/10 (P-V)
Optical cleanness of polished surfaces: up to 3x0.025 (according to ISO 10110-7), or up to 10 - 5 (according to MIL 13830)
Protective chamfer per requirements