FWS-Mono
The FWS-Mono is a tunable bandpass filter with a single, selectable wavelength range. Tuning of the center wavelength and the adjustable bandwidth are completely computer controlled.
- Wavelength selectable within 255-1700 nm range
- 16 selectable configurations
- Tunable FWHM bandwidth 2-15 nm
- Out-of-band blocking >OD6
- Software interface and SDK
FWS-Poly
The FWS-Poly is an integrated multi-filter with widest tuning range. Complete software control of wavelength and bandwidth via USB connection ensure easy and convenient usability.
- Wavelength range 255 – 1700 nm
- Poly BLUE: Fixed FWHM bandwidth 10 nm or 20 nm
- Poly RED: Tunable FWHM bandwidth 2-15 nm
- Aperture 5 mm (standard) or 10 mm (extended)
- Software interface and SDK
CWS
The CWS is a fixed wavelength bandpass filter module with simple and rugged optomechanical design. The devices are factory set to your exact specifications and are ideal for any imaging, microscopy, or illumination application.
- Customer defined center wavelength from 255 – 1700 nm
- Customer defined bandwidth 2- 15 nm (FWHM)
- High transmission >75%
- Compact, rugged and robust, ideal for machine integration
- 5 mm or 10 mm aperture
FWS-Centerline
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The FWS-Centerline is a manually tunable filter with fixed bandwidth. A compensator plate is ensuring stable beam output direction.
- Wavelength selectable within 255-1700 nm range
- 16 selectable configurations
- Fixed bandwidth 20 nm (FWHM)
- Manual tuning
- Compensation of beam offset
- 5 mm or 10 mm aperture
FWS-Basic
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The FWS-Basic is manually tunable bandpass filter. The 3 control knobs provide tuning of center wavelength, adjustment of bandwidth and compensation of spatial walk-off.
- Wavelength selectable and tunable within 255-1700 nm range
- 16 selectable configurations
- Adjustable bandwidth 2-15 nm (FWHM)
- Manual tuning
- Compensation of beam offset
FWS-High Resolution
The FWS-High Resolution is a tunable filter that provides smooth and manual adjustment. Both the center wavelength and bandwidth are independently set with two multi-rotation manual dials for precise adjustment and maximum resolution.
- Wavelength selectable and tunable within 255-1700 nm range
- 16 selectable configurations
- Adjustable bandwidth 2-15 nm (FWHM)
- High precision manual tuning
- Compensation of beam offset
Tunable Bandpass Filters for Spectroscopy and Spectral Imaging
The Flexible Wavelength Selectors (FWS) are unique compact optomechanical devices that utilize Spectrolight’s patented TwinFilm™ technology to deliver the wavelength tuning and adjustable bandwidth with the imaging advantages of a circular aperture filter. The filter technology covers a wide wavelength range and can be configured for may applications such as fluorescence spectroscopy or hyperspectral imaging. The unique combination of broadband filters provides the tuning capability for the center wavelength and the bandwidth adjustment with high accuracy, excellent out-of-band blocking without beam deviation or walk-off. The compact opto-mechanical design ensures simple and easy product integration.
Principle and Applications of Tunable Filters
Selecting a proper wavelength is a critical procedure for spectroscopy and microscopy. Traditional methods such as filters, monochromators, and acousto-optic tunable filters have advantages and disadvantages. Users choose the best item suited to their purpose of use, costs, required properties, and compatibility with their system. Spectrolight developed a device to combine the advantages of existing equipment. The underlying technology is TwinFilm technology, which consists of broadband angle dependence bandpass filters and a compensator plate (see Fig. below). The bandpass filters are independently rotatable, converting collimated broadband light into any desired combination of center wavelength and bandwidth. The compensator plate offsets the slightly misaligned beam pass by two rotating bandpass filters.
This technology shows out-of-band extinction suppression effect (10-6) like a monochromator and has a uniform property of about 95% at a clear aperture of up to 10 mm, similar to a filter. The transmission efficiency is more than 75%, which is significantly higher than with other technologies and avoiding the walk-off phenomenon. It has very sharp excitation and emission windows, and the bandwidth can be adjusted from 3 to 15 nm in FWHM. Also, its tuning range covers the UV to near-IR. These advantages make it suitable for wide-field imaging.
The FWS filters can be combined with SLI’s broadband and supercontinuum light sources to form a plug&play tunable light source without any alignment or adjustments. It enables easy and precise selection of a wide spectral range. Light sources and filters can be tailored for the requirements of many applications.
Contact us for further information and to start the discussion on how we can help to improve your applications!
The FWS tunable bandpass filters are manufactured by GWU’s partner Spectrolight.
