Glossary: Finding what you need

Below are some guidelines as to how best to find a filter or coating that meets your specific need. The most significant characters in the SKU are the 2nd through 5th characters. These define the prominent wavelengths, whether a band center, edge, or some other feature.

The following characters define the general category of the product and fall between the 6th and 8th characters:

• NB is a band pass filter of two Fabry-Perot (FP) interfering cavities and the band shape will follow the performance detailed in Table 1, Column 2

  • These coatings are typically available from the UVB to NIR regions

  • Typical FWHM is 0.001 to 0.020 times the CWL

  • Typical out of band average attenuation is 4.0 OD

• SC is a band pass filter of a single FB cavity.  These are typically very narrow passbands with shape characteristics in Table 1, Column 1

  • These coatings are typically available in the Vis to NIR

  • Typical FWHM is 0.0002 to 0.01 times the CWL

  • Typical out of band attenuation is OD 3.0 to 4.0

  • These filters are used with atomic line emission

• BP is a band pass filter of three interfering cavities. The band shape will be found in Table 1, Column 3

  • These coatings are typically available from the DUV to MIR,

  • Typical FWHM is 0.001 to 0.01 times the CWL

  • Typical out of band blocking is OD 4.0 to 5.0

  • These filters are the most common category

• WB is a band pass of 5 interfering cavities.  The band shape is defined in Table 1, Column 3

  • These coatings are typically available from the DUV to MIR,

  • Typical FWHM is 0.001 to 0.01 times the CWL,

  • Typical out of band blocking is OD 4.0 to 5.0

  • These filters are the most common category

• DF is a band pass of 6 or more interfering cavities and has a shape defined in Table 1, Column 6

  • These coatings are available in the vis and NIR,

  • Typical FWHM is 0.03 to 0.2 times the CWL,

  • Typical out of band blocking is OD 6.0 to OD 7.0,

  • These filters are commonly used for Fluorescence emission bands

• CF is a long pass or short pass filter of moderate slope.  The value of slope is typically 2% from 80% T to 90% R

• AF is a band pass filter that is defined by a sharp cut-on and cut-off filter. Typical edges are a few percent from OD 0.3 to OD 5.0+

• SP is a Short-Pass edge filter

• LP is a Long-Pass edge filter

• HSP is a Sputtered Short-Pass filter

• HLP is a sputtered Long-Pass filter

• HBP is a sputtered band pass filter

• Dichroic-LP is a Long-Pass filter intended for non -normal incidence, usually 45 degrees

• Dichroic-SP is a Short-Pass filter intended for use at non-normal incidence, usually 45 degrees