664nm (+/-10nm) Interference Filter
These filters are placed in front of the photodiodes to block fluorescence induced in the sample, which otherwise artificially increases the apparent molar mass. Required when characterizing samples that fluoresce under excitation by the DAWN’s laser. Typically placed on half of the MALS detection angles, filters are available for the standard 658 nm laser or 785 nm IR laser. The filters transmit a band of ± 10 nm around the specified central wavelength.” (generic for all 3 MALS filter kits).