Alluxa has announced the development of two Hydrogen Alpha (H-alpha) Emission Line Filters for astronomy applications. Though these new filters have been specifically tailored to monitor H-alpha spectra in astronomy, they can also be used in any application where spectral line discrimination is critical, including spectroscopy, plasma monitoring and fusion research.
The novel 5 Cavity H-alpha Filter sets a new standard for narrow filters with regard to squareness. It has a 50 per cent BW of only 0.35 nm, a 1% BW of <0.6 nm, and a peak transmission of approximately 80% and is fully blocked to OD6 out of band (see graph below):
Alluxa’s 2 Cavity H-alpha Filter features an even narrower design with a FWHM of 0.12 nm and peak transmission of greater than 90 per cent, as shown in the graph below:
