Optical Notch Filters

Optical Notch Filters are components that block light in a typically narrow wavelength range and transmit light outside this range.

The filter is fully customisable in terms of centre wavelength and bandwidth, enabling applications in a broad range of practical technologies including Raman spectroscopy, fluorescence spectroscopy, microscopy and many other applications.

Delta Optical Thin Film are pioneers and innovators in the design and manufacture of robust optical thin film components for a broad range of volume applications. We have designed and manufactured optical interference bandpass filters since the early 1970’ties.

Most of our products are custom designed filters and the examples we show on this webpage are just for inspiration. We often find benefits for our customers in a custom designed solution. Delta Optical Thin Film is focusing mainly on filters in the range from 300 nm to 1200 nm.

Choose from a range of existing optical notch filters

Delta Optical Thin Film manufactures Optical Notch Filters using either Plasma Assisted Evaporation Technology or Magnetron Sputtering Technology, depending on our customers’ requirements. On this web site you can find examples of Notch Filters we have already manufacured.

All data sheets show actual measurements with typical transmission curves for unpolarized light and an AOI=0°.

As we often can optimise design and manufacturing methods to the individual application, please get in touch to discuss how we can best help facilitating your application.

If you cannot find the Optical Notch Filter you need among our standard products, please do not hesitate to contact us to discuss your requirements. When specifying your filter, our technical note on specifying optical filters will help you avoid the main cost drivers in filter design.

Product specifications

Center wavelength (nm)Blocking range (nm)Peak blockingProduct numberMax size Data sheet
64220OD6LF10470840 mm x 40 mm x 2 mmDownload_15px

Applications of Optical Notch Filters

Optical notch filters are typically used to block a strong peak emission from a laser or fluorescent lamp.

An example of a technology where notch filter are used is Raman spectroscopy, where the laser intensity is orders of magnitude larger than the weak Raman scatteering. For this reason it is common to use a Notch filter after the sample to block the laser wavelength thereby avoiding to drown the wanted Raman scattering in light from the laser.

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Have a look at our existing products or get in touch regarding your needs – we are the optical filter company.

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