Bandpass Filters

Bandpass Filters

Bandpass Filters

A bandpass filter is an inexpensive optical filter used as a wavelength selector that allows transmission of a predetermined wavelength while rejecting or blocking other wavelengths. Along with our wide selection of standard infrared filters, Optometrics designs and manufactures custom bandpass filters for instrument manufacturers world wide.

  • Clinical chemistry instrumentation
  • Spectral radiometry
  • Environmental testing
  • Colorimetry
  • Elemental and laser line separation
  • Flame photometry
  • Color separation
  • Fluorescence
  • Immunoassays

Optical Bandpass Filter – Typical Transmission Curve

Filter terminology
Filter Terminology

Transmission Curves are graphs or mathematical functions that characterize optical filters. Typically expressed as the percent or fraction of light transmitted versus wavelength.

  • Bandwidth is a range of wavelength that specifies the transmitted part of the spectrum.
  • Central Wavelength (CWL) is the midpoint wavelength of the bandwidth.
  • Peak Transmittance is the maximum percentage of light transmission through the filter. It is often centered at the CWL, but many filters have fairly flat transmittance across the bandwidth.
  • Half Bandwidth (HBW) or Full Width-Half Maximium (FWHM) is the wavelength range that characterizes a bandpass filter. It is bound by the wavelengths where transmittance is half (50%) that of the peak transmission.
  • Upper and Lower Blocking Regions are the ranges of wavelengths where the light is attenuated.

Choosing an Optical Filter

Product SKUs


Product Listing


  • 1064 nm Laser Line Filter, 3 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | FL-1064-3-25

    CWL

    1064 nm

    CWL Tolerance

    ± 0.6 nm

    FWHM

    3 nm

    FWHM Tolerance

    ± 0.7 nm

    Minimum Peak Transmission

    45

    Blocking

    ≥ 4 OD

    Blocking Range

    X-ray – 1200 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1000 – 1099 nm

  • 1310 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1310-12-25

    CWL

    1310 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    40

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1300 – 1399 nm

  • 1320 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1320-12-25

    CWL

    1320 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    40

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1300 – 1399 nm

  • 1330 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1330-12-25

    CWL

    1330 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    40

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1300 – 1399 nm

  • 1340 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1340-12-25

    CWL

    1340 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    40

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1300 – 1399 nm

  • 1480 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1480-12-25

    CWL

    1480 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    35

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1400 – 1499 nm

  • 1490 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1490-12-25

    CWL

    1490 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    35

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1400 – 1499 nm

  • 1510 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1510-12-25

    CWL

    1510 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    35

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1500 – 1599 nm

  • 1520 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1520-12-25

    CWL

    1520 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    35

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1500 – 1599 nm

  • 1530 nm Bandpass Filter, 12 nm FWHM, 25.0 mm Dia.

    Bandpass Filter Specifications | F-1530-12-25

    CWL

    1530 nm

    CWL Tolerance

    ± 2 nm

    FWHM

    12 nm

    FWHM Tolerance

    ± 2.4 nm

    Minimum Peak Transmission

    35

    Blocking

    ≥ 4 OD

    Blocking Range

    200 – 3000 nm

    Size (mm)

    25.0 mm dia.

    Size Tolerance

    +0, -0.1 mm

    Thickness

    7.5 mm

    Thickness Tolerance

    +0, -0.2 mm

    Clear Aperture

    21.0 mm

    Mount

    Aluminum, Black Anodized

    Ring Marking

    CWL, FWHM, Light Direction

    Specification Temperature

    23˚ C

    Operating Temperature Range

    -50° C to +70° C

    Humidity Resistance

    MIL-810-810E, Method 507.3, 5 Cycles

    Optical Quality

    Commercial

    CWL (Range)

    1500 – 1599 nm