Narrow bandpass filters are designed to isolate a narrow region of the infra-red spectrum.
Bandpass filters are designed to isolate a relatively wide spectral band.
Wide bandpass filters are designed to isolate a very wide spectral band.
Long Wave Pass filters (also referred to as edge filters) are constructed from stacks of thin layers.
Short wave pass filters are distinguished by a sharp transition from a zone of transmission to a zone of rejection.
The majority of neutral density filters offered are manufactured with a metallic coating which attenuates incident light by both reflection and absorption
A range of special purpose narrow band filters for gas and vapour analysis are generally available ex-stock at very competitive prices.
Blocking and order sorting filters are frequently used in measuring equipment to suppress unwanted wavelengths.
Semiconductor filters are, strictly, not thin film filters, but absorption filters, relying on the electronic band of their structure.
Capabilities in anti-reflection coatings range from single layers to advanced high efficiency multi-layer coatings.