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Optical Filters

EuroPhotonics
Winter 2019Delta Optical Thin Film AS has developed a range of optical filters for Leica Microsystems’ SP8 DIVE Deep In Vivo Explorer.

The range includes Continuously Variable Short Wave Pass Filters, Continuously Variable Long Wave Pass Filters, and a Continuously Variable Dichroic Beamsplitter. A continuously variable filter is a wedged filter that has spectral properties that vary continuously along one dimension of the filter. Just one of the devices can be used as an alternative to several fixed filters in an instrument, and the center or edge wavelength can be adjusted by sliding the optical filter.

All continuously variable filters are coated with ultra-hard surface coatings, which are produced with an advanced plasma process that builds layer with a much higher packing density than traditional hard coatings. The combination of continuously variable long wave pass filters and continuously variable short wave pass filters enables the construction of bandpass filters, which can be tuned continuously between 380 and 800 nm. These filters also have the advantage of tunable bandwidth.

The filters feature high edge steepness and transmission levels while providing improved blocking. Coated on a single fused silica substrate, they exhibit minimal auto-fluorescence and a high threshold for laser damage.More products