Customer and application specific high-performance optical filters

In a Homogeneous Filter, the optical filter properties are constant across the clear aperture of the filter.

We manufacture Homogeneous Filters and Beamsplitters from UVA, through VIS and into NIR.

Our Homogeneous Filters are divided into the following main product categories:

• Homogeneous Bandpass Filters

• Homogeneous Blocking Filters

• Homogeneous Edge Filters (Long Wave Pass and Short Wave Pass)

• Homogeneous Beamsplitters

Continuously Variable Filters (CVFs) – also known as Linear Variable Filters – from Delta Optical Thin Film offer unprecedented tunability over a large wavelength range, steep filter edges and high out of band blocking. These filters have enabled many applications that was previously not possible.

A CVF is a wedged filter, whose spectral properties vary continuously along one dimension of the filter. It is common to call these filters Linear Variable Filters (LVFs) but, we do however prefer to call our filters Continuously Variable Filters because the progression along the long side of the filter is never 100% linear and can sometimes be for example exponential.

A single CVF for example can replace a large number of fixed filters or a grating based monochromator in an instrument. It is possible to adjust the center or edge wavelength by sliding the filter or rotating it and in this way build a tunable wavelength filter and/or an adjustable bandpass filter.