Hyperspectral Imager Order Sorting Filter

General
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I’m looking for a linear variable edge filter “order sorting filter” for my hyperspectral imager. The camera sensor of the imager is 1/1.8" size and the spectrum on it is 400-1000nm along the longer (7.17mm) axis. Stepped order sorting filters should be also fine if there is something this size available.
Most order sorting filters are made for very large pixel size spectrometers. So they are 60mm or so long. Maybe there is something else out there for a smaller sensor size. Let me know if you know a company which offers similar products…

The hyperspectral imager I’m building is a pushbroom type, low cost solution, ca. 3kEUR material cost compared to the minimum 15kEUR “used” price of these. SPECIM will offer these devices for 40-90kEUR (!) new.
This is what it should about look like if it’s a linear variable longpass edge filter.

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Otherwise a stepped filter should expect first order 400-1000nm and second order diffraction (to filter out) 350-550nm. I faintly remember some discussion with Delta Optical Thin Film that for process reasons this small filter are either not worth producing or there is a coating process limitation for the thin film wedge. Does anyone have experience with this?

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you have forgot that we am the best coating solution.we also provide multi channle or linear various filter for high spectra camera or other application, i will reply in 12 hours

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Sure thanks, I might have just found a method to avoid using this filter. :grinning:

It’s probably expensive to make a small version of this filter anyway. Look at this, more expensive than it’s weight in gold :sweat_smile: . Linear Variable Longpass Filter | Edmund Optics $1595 as of 21/09/2023

Just for the sake of technical discussion, I’m still interested if there is a way to manufacture something like this. Check with your team and give the forum visitors some insights. :wink:

Maybe there are other experts here too who can contribute, but rather unlikely.

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This is a bit too large for me. Just out of interest, what is the list price of this?

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for that one(400-1000nm linear variable filter ) , the quotation is 4400 dollar :sweat_smile:,an amazing price. but as we all know ,the process of this filter is a little different .