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IR Bandpass Filters: 1750 nm - 6000 nm Central Wavelength


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IR Bandpass Filters: 1750 nm - 6000 nm Central Wavelength

bandpass filter engraving schematic
bandpass filter drawing

Features

  • Central Wavelengths from 1750 nm to 6000 nm
  • 0.5 µm Bandpass Region (FWHM)
  • Minimum Peak Transmission: 70%
  • Ø1" Mounted Filters with Ø21 mm Clear Aperture
  • Out-of-Band Transmission:
    • For CWL from 1.75 to 4.75 µm, and CWL = 5.25 µm: <0.1% from 200 nm - 12 µm
    • For CWL = 5.00 µm and CWL from 5.50 to 6.00 µm: <0.1% from 1.8 - 9.5 µm

The bandpass filters shown on this page feature center wavelengths from 1.75 to 6.00 µm. Transmission curves for individual filters are available by viewing the Transmission Data link for each filter on the Specs tab. Each filter is epoxied into a black anodized aluminum ring with an outer diameter of Ø1" and maximum edge thickness of 6.1 mm, which is compatible with our SM1 Lens Tubes. These filters feature a longer total lifetime than our UV, Visible, and NIR bandpass filters because they are fabricated from a single coated substrate. This fabrication technique also allows the unmounted filters to be used without resulting damage; however, the blocking transmission may be affected. As these filters cannot be removed from their mounts after purchase, please contact Tech Support to custom order unmounted filters.

Thorlabs' bandpass filters provide one of the simplest ways to transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Their design is essentially that of a thin film Fabry-Perot Interferometer formed by vacuum deposition techniques and consists of two reflecting stacks, separated by an even-order spacer layer. These reflecting stacks are constructed from alternating layers of high and low refractive index materials, which can have a reflectance in excess of 99.99%. By varying the thickness of the spacer layer and/or the number of reflecting layers, the central wavelength and bandwidth of the filter can be altered.

Transmission Direction
An arrow on the metal housing, next to the item number, indicates the direction of transmission through the filter.

Additional Bandpass Filters
UV/Visible Bandpass Filters
340 - 694.3 nm CWLs
NIR Bandpass Filters
700 - 1650 nm CWLs
MIR Bandpass Filters
1750 - 6000 nm CWLs
LWIR, FIR, and THz Filters
15 - 150 µm CWLs
Premium Bandpass FiltersBandpass Filter Kits
We also offer custom bandpass filters with other central wavelengths or FWHM. To request a quote, contact Tech Support.
Item #Transmission/
OD Dataa
Center WavelengthSubstrate
FB1750-500Info1750 ± 50 nmN-BK7
FB2000-500Info2000 ± 50 nmN-BK7
FB2250-500Info2250 ± 50 nmSapphire
FB2500-500Info2500 ± 50 nmSapphire
FB2750-500Info2750 ± 50 nmSapphire
FB3000-500Info3000 ± 50 nmSapphire
FB3250-500Info3250 ± 50 nmSapphire
FB3500-500Info3500 ± 50 nmSapphire
FB3750-500Info3750 ± 50 nmSapphire
FB4000-500Info4000 ± 50 nmSapphire
FB4250-500Info4250 ± 50 nmSapphire
FB4500-500Info4500 ± 50 nmSapphire
FB4750-500Info4750 ± 50 nmSapphire
FB5000-500Info5000 ± 50 nmGe
FB5250-500Info5250 ± 20 nmSi
FB5500-500Info5500 ± 50 nmGe
FB5750-500Info5750 ± 50 nmGe
FB6000-500Info6000 ± 50 nmGe
  • Click on More Info Icon for a plot and downloadable data.
Common Specifications
Bandwidth
(Full Width at Half Maximum
)
500 ± 100 nm
500 ± 20 nm (FB5250-500 Only)
Peak Transmission (Min)70% at CWL
75% at CWL (FB5250-500 Only)
Out-of-Band Transmission<0.1% from 0.2 - 12 µm (For CWL from 1.75 to 4.75 µm,
and CWL = 5.25 µm)
<0.1% Average from 1.8 - 9.5 µm (For CWL = 5.00 µm
and CWL from 5.50 to 6.00 µm)
Clear ApertureØ21 mm
Housing Diameter1" (25.4 mm)
Housing Diameter Tolerance+0.0 / -0.2 mm
Thickness6.1 mm
Thickness Tolerance+0.00 / -0.10 mm
Surface/Coating Quality80-50 Scratch-Dig
Edge TreatmentMounted in Black Anodized Aluminum Ring
Edge MarkingsItem # ↑;
The Arrow Points in the Direction of the Light Transmission
Operating Temperature-50 to 80 °C (21 °C is Optimal)
-20 to 60 °C (FB5250-500 Only)
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+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FB1750-500 Support Documentation
FB1750-500 Ø1" IR Bandpass Filter, CWL = 1.75 µm, FWHM = 0.5 µm
$300.00
Today
FB2000-500 Support Documentation
FB2000-500 Ø1" IR Bandpass Filter, CWL = 2.00 µm, FWHM = 0.5 µm
$300.00
Today
FB2250-500 Support Documentation
FB2250-500 Ø1" IR Bandpass Filter, CWL = 2.25 µm, FWHM = 0.5 µm
$300.00
Today
FB2500-500 Support Documentation
FB2500-500 Ø1" IR Bandpass Filter, CWL = 2.50 µm, FWHM = 0.5 µm
$300.00
Today
FB2750-500 Support Documentation
FB2750-500 Ø1" IR Bandpass Filter, CWL = 2.75 µm, FWHM = 0.5 µm
$300.00
Today
FB3000-500 Support Documentation
FB3000-500 Ø1" IR Bandpass Filter, CWL = 3.00 µm, FWHM = 0.5 µm
$300.00
Today
FB3250-500 Support Documentation
FB3250-500 Ø1" IR Bandpass Filter, CWL = 3.25 µm, FWHM = 0.5 µm
$300.00
Today
FB3500-500 Support Documentation
FB3500-500 Ø1" IR Bandpass Filter, CWL = 3.50 µm, FWHM = 0.5 µm
$300.00
Today
FB3750-500 Support Documentation
FB3750-500 Ø1" IR Bandpass Filter, CWL = 3.75 µm, FWHM = 0.5 µm
$300.00
Today
FB4000-500 Support Documentation
FB4000-500 Ø1" IR Bandpass Filter, CWL = 4.00 µm, FWHM = 0.5 µm
$300.00
Today
FB4250-500 Support Documentation
FB4250-500 Ø1" IR Bandpass Filter, CWL = 4.25 µm, FWHM = 0.5 µm
$300.00
Today
FB4500-500 Support Documentation
FB4500-500 Ø1" IR Bandpass Filter, CWL = 4.50 µm, FWHM = 0.5 µm
$300.00
Today
FB4750-500 Support Documentation
FB4750-500 Ø1" IR Bandpass Filter, CWL = 4.75 µm, FWHM = 0.5 µm
$300.00
Today
FB5000-500 Support Documentation
FB5000-500 Ø1" IR Bandpass Filter, CWL = 5.00 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5250-500 Support Documentation
FB5250-500 Ø1" IR Bandpass Filter, CWL = 5.25 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5500-500 Support Documentation
FB5500-500 Ø1" IR Bandpass Filter, CWL = 5.50 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5750-500 Support Documentation
FB5750-500 Ø1" IR Bandpass Filter, CWL = 5.75 µm, FWHM = 0.5 µm
$1,000.00
Today
FB6000-500 Support Documentation
FB6000-500 Ø1" IR Bandpass Filter, CWL = 6.00 µm, FWHM = 0.5 µm
$1,000.00
Today
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