Product/Service

Linear Variable Filters (LVF)

Source: Delta Optical Thin Film A/S
DELTA's Linear Variable Filters provide an extended set of performances within one single filter. DELTA has lifted the quality of variable filters to new levels by introducing a new powerful combination of linear variable filters.
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Achieve full tunability in your system by using the following Linear Variable Filters:

•Overview of our Linear Variable Filters
•Long Wavelength Pass filter: Edge to be tuned from 300 – 850 nm
•Short Wavelength Pass filter: Edge to be tuned from 340 – 850 nm
•Dichroic: Edge to be tuned from 320 – 750 nm
•UV Band Pass Filter: Center Wavelength to be tuned from 300 nm – 350 nm

DELTA offers a Linear Variable Long Wave Pass filter (LVLWP), the corresponding Linear Variable Short Wave Pass filter (LVSWP), a Linear Variable Dichroic, and a Linear Variable UV Band Pass (LVUVBP). Each of the filters can be used separately. Combining LVLWP and LVSWP enables the construction of band-pass filters that can be tuned continuously with center wavelengths from 320 nm to 850 nm, with the added benefit of tunable bandwidth.

Besides setting new standards in transmission level and edge steepness, the filters offer blocking better than OD 3 over the complete reflection range. It is possible to increase the blocking to beyond OD5 by placing another linear variable filter in series.

The filters are coated on single quartz substrates for minimal auto-fluorescence and high laser damage threshold. All of DELTA's Linear Variable Filters are coated with ultra-hard surface coatings (UHC) that are also used by DELTA in traditional fluorescence filters.

DELTA's new Linear Variable Filters are especially suited for applications in spectroscopy. A Linear Variable Filter (LVF) is a wedged filter, whose spectral properties vary linearly. A single LVF for example can replace a number of dedicated filters in an instrument. It is possible to adjust the position of the edge by sliding the filter.

For more information on optical filters from DELTA, please visit our filter catalog.