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My Stores LogoMy Stores LogoCheck out my other items! Note that this filter is only the element that isolates the Hydrogen Alpha from other red light. The final assembly will require ancillary elements to control the wavelengths less than 600nm, and above 700nm.

A single precision Optical Interference Filters.This single filter, when mounted in a dual dual-pass tilting mount (as shown in optical schematic), will produce a sub-angstrom passband, tuned for Hydrogen Alpha. This is specifically for isolating the Hydrogen Alpha atomic emission from the sun. The filter allows typically over 10% of an extremely narrow band (less than 0.1nm) of energy centered on this primary atomic transition created when excited Hydrogen vapor cools.

Other light from the red region of the spectrum is attenuated, as well as the NIR spectral region to the far IR (3,000nm) is prevented from passing by the KG glass (not included). This glass also limits heating of the ultra-narrow pass-band.

This filter arrangement has been been suggested by Oliver Smie. 

These filters are very difficult to produce, due to the large number of layers needed to achieve the narrow transmission band. The process includes the condensation of elemental matter in very precise layers, onto a glass window.

Filter will be provided with current spectral performance.

The Filter Specifications follow: CWL 656.28 nm, after user tuning, in user provided mount. HBW 0.07 +/-.02 nm, Size 25 mm round, Transmission curve of the element included.

Thanks for looking! Original cost exceeds $1000.00, New Old Stock from Omega Optical that is remeasured and supplied with exact performace.

If you don't find what you want with a simple search in my BJOMEJAG EBUYER STORE, try a wild card search by using an asterics after the wavelength.

If you are still not finding a good match, follow my links to Omega's Build a Filter. With a note to the effect that cosmetic seconds are acceptable, you will be surprised how economical an exact match can be.

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On Apr-15-12 at 13:23:40 PDT, seller added the following information: