I want to find a colored filter glass that combined from a low- and high-pass filter to support 780 nm wavelength by 10 or 15 nm accuracy in peak of transition.
Not sure what you mean. Are you looking for a filter transmitting 780nm and something either side. Does it have to block 100% other wavelengths further away?
Can't see what this is to do with comfort.
Such a bandpass filter would inevitably be an interference filter.
http://www.edmundoptics.com/optics/optical-filters/bandpass-filters/traditional-coated-700-999nm-bandpass-interference-filters/86637
If you mean a 780nm laser cleanup filter, then go to:
http://www.semrock.com/FilterDetails.aspx?id=LL01-780-12.5
It is a high performance interference filter which passes more than 90% of 780 nm light and blocks on both sides with an FWHM of typical 3,0 nm
Regards
WK
Dear Sajjad,
If you would be more precise in telling us the purpose of your desired filter, we could probably be of more help. It seems that you do not want to clean the output of a 780 nm laser. If you want to filter out a spectral region around 780 nm with about 30 nm FWHM then you may think in using a combination of a shortpass edge and a longpass edge filter, e.g.:
Shortpass (SP):
http://www.edmundoptics.com/optics/optical-filters/shortpass-edge-filters/shortpass-filters/47818
Longpass (LP):
http://www.edmundoptics.com/optics/optical-filters/longpass-edge-filters/longpass-filters/64623
Filter curves:
for LP see:
http://www.edmundoptics.com/techsupport/resource_center/product_docs/curv_64623.pdf
for SP see:
http://www.edmundoptics.com/techsupport/resource_center/product_docs/curv_47818.pdf
With this combination you may reach about 25 nm FWHM due to:
Rejection wavelength: LP: 590-740 nm; SP: 850-1050 nm
Transmission wavelength: LP: 805-2000 nm; SP: 400-775 nm
Cutoff wavelength: LP: 775 nm; SP: 800 nm
As attached file you can see the result (transmission curve, dotted red line) if both filters are used together (I have approximately overlapped the two curves in the region of interest). The transmission region is not ideal, however, the transmission region on the lower wavelength side can be changed slightly by tuning the angle of the filter from 90 degrees incidence to lower values - by this you may obtain an ideal filter for your purpose with about 30 nm FWHM.
Both filters are quite cheap: 90$ each, so the combination is 180$ only.
Hope, this information helps you.
Regards
Wolfgang Kiefer
For stacking the two filters see also:
http://www.edmundoptics.com/technical-resources-center/optics/custom-bandpass-filter-using-shortpass-and-longpass-filters/
I am not quite sure whether or not these filters are slightly wavelength tunable by tilding the incidence angle. You may ask the manufacturers first, however, probably the sketched set-up with the two (untilted) filters is sufficient for your purpose.
WK
Dear Wolfgang Kiefer
is this filter a color filter?
I have a question, has a color filter any coating?or it has only substrate?
in this filter what is it's coating
http://www.edmundoptics.com/optics/optical-filters/shortpass-edge-filters/shortpass-filters/47818
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