Ideally, I would like a filter that passes exactly three distinct wavelength ranges. I could get an arbitrary two-pass via an appropriate choice of notch, but not clear how to get an arbitrary three-pass? (I have found some specific three-pass filters, but they only come in certain varieties.)
2006-08-24 12:58:21 · 2 answers · asked by A professor (thus usually wrong) 3 in Science & Mathematics ➔ Engineering
Sounds like you need to ask an optical coating manufacturer to customize a coating for you that will pass the bands you want.
This would have to be done in a single filter; just combining 3 filters that each pass one of your desired bands will yield practiclly ZERO transmission in all bands.
2006-08-24 14:24:46 · answer #1 · answered by genericman1998 5 · 0⤊ 0⤋
One way would be to combine three filters, each of which blocks out a portion of the spectrum that you wish to block out.
An interference filter can be designed to pass arbitrary regions of the spectrum. It takes some special software to design it.
Some laser filters have been designed to block out selected wavelengths for use with multiple laser wavelengths.
2006-08-24 13:40:35 · answer #2 · answered by Doctor 7 · 0⤊ 0⤋