Short Pass Filters

Short pass interference filters

Short pass interference filters are a kind of cut-off filter. They reflect the short wave region and transmit the long wave region, so that light on one side of a cut-off edge passes while light on the other side is rejected. That behaviour suits systems that need to remove short wave light while keeping longer wave light, or that need a clean cut-off edge as part of a larger optical assembly. This page describes the category and the inquiry checklist. It does not publish a cut-off wavelength table for this line, because no deep specification page has been documented for short pass filters.

Short pass compared with narrow band pass

A short pass filter and a narrow band pass filter are often considered together, because both shape a spectrum, but they do different jobs. A short pass filter passes everything on the long wave side of its edge and rejects the short wave side. A narrow band pass filter, described on the narrow band pass filters page, passes a narrow band and rejects on both sides of it. Choosing between them starts with that shape question: do you need a band, or do you need an edge? The narrow band pass versus short pass guide compares the two families at category level, without a specification value comparison table.

What to confirm in your inquiry

Please confirm the following items in your inquiry before ordering: the cut-off edge or wavelength region you need; the transmission behaviour you need on the long wave side; the rejection behaviour you need on the short wave side; the size and shape you need; the substrate material if it matters; and the quantity basis and delivery basis for your order. For the wider filter family, see interference filters and optical filter types.