High‑performance linear variable bandpass filters built on decades of optical innovation, enabling you to reduce system complexity.
Linear Variable Bandpass Filters
Linear variable bandpass filters (LVBF) deliver precise spectral control in a compact, tunable format.
- Fast, wavelength selection by translation
- Smaller and simpler systems compared to filter wheels
- High transmission and stable optical performance
- Easy integration into hyperspectral and sensing applications
How does an LVBF work?
Continuously Variable Bandpass Filters – also known as Linear Variable Bandpass Filters – are optical filters where the centre wavelength of the band varies continuously at various positions on the filters.
Linear Variable Bandpass Filters vary their centre wavelength along a linear axis, typically along the longest dimension of the filter substrate.
The variation itself might be close to linear to the position but can also follow other functions (e.g. exponential).
Linear Variable Bandpass Filter product specifications
Below you can explore a selection of products we have manufactured. Some are available from stock, while others are made to order.
We work closely with our customers to design customized filters tailored to the specific needs of each application.
| λcenter min (nm) | λcenter max (nm) | FWHM (nm) | Tpeak (%) | Product number | Max size | Data sheet |
|---|---|---|---|---|---|---|
| 400 | 700 | 3 - 9 | 25 - 80 | LF102773 | 60 mm x 25 mm x 2.5 mm |  |
| 400 | 700 | 7 - 20 | 40 - 90 | LF103729 | 60 mm x 25 mm x 2.5 mm | |
Product example: LVVISBP (LF103729)
Continuously Variable Bandpass Filter for the visible wavelength range from ≤ 400 nm to ≥ 700 nm within ≤ 45 mm.
- FWHM Bandwidth is monotonously increasing from 7 nm at 400 nm to 20 nm at 700 nm
- Peak transmittance is monotonously increasing from ~40% to ~90% in the 400 nm 700 nm range
- Broad-band blocking ≤0.1% in the 300 nm 850 nm range
Typical applications of Linear Variable Bandpass Filters
Tunable light source
When combined with a broadband light source, our Linear Variable Bandpass Filters can be used to create a tunable light source. By translating the filter along the long edge of the substrate, you can select any desired wavelength.
Read how to create tunable filters using linear variable filters in our tech note here.
Compact spectrometer
A linear variable bandpass filter mounted directly above a photodetector array forms a compact and rugged spectrometer assembly without any moving parts.
Linear variable filters can also be used as the order sorting filter in a compact grating-based spectrometer. Read more about linear variable filters as order sorting filters here.
Frequently asked questions about Linear Variable Bandpass Filters
What advantages do LVBP filters offer compared to fixed bandpass filters?
LVBP filters provide continuous wavelength tunability, compact system design, and high spectral stability. They replace large filter sets, simplify instrument architecture, and enable fast, flexible wavelength selection in compact spectrometers, imaging systems, and hyperspectral setups.
Can LVBP filters be customized for specific wavelength ranges or system geometries?
Yes. Delta Optical Thin Film offers custom wavelength ranges, gradients, substrate sizes, and blocking performance. Filters can be optimized depending on your system requirements.
What applications benefit most from LVBP filters?
LVBP filters are widely used in compact spectrometers, hyperspectral imaging, fluorescence detection, environmental sensing, semiconductor inspection, and OEM analytical instruments—anywhere tunable, space‑efficient spectral selection is needed.
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