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IR Bandpass Filters: 1750 nm - 6000 nm Central Wavelength


  • Pass Regions from 1.75 to 6.0 µm
  • 500 nm Bandwidth (Full Width at Half Max)
  • Ø1" Mounted Filters

FB2250-500

Transmission Direction Indicator

FB2500-500

FB4500-500

Related Items

bandpass filter engraving schematic
bandpass filter drawing

Features

  • Central Wavelengths from 1.75 to 6.0 µm
  • 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
12.5 - 590 µm CWLs
Premium Bandpass Filters Bandpass Filter Kits
We also offer custom bandpass filters with other central wavelengths or FWHM. To request a quote, contact Tech Support.
Common Specifications
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)
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)
Housing Diameter 1" (25.4 mm)
Housing Diameter Tolerance +0.0 / -0.2 mm
Clear Aperture Ø21 mm
Thickness 6.1 mm +0.00 / -0.10 mm
Surface/Coating Quality 80-50 Scratch-Dig
Edge Treatment Mounted in Black Anodized Aluminum Ring
Edge Markings Item # ↑;
The Arrow Points in the Direction of the Light Transmission
Optimum Operating Termperature 21 °C
Operating Temperature -50 to 80 °C
-20 to 60 °C (FB5250-500 Only)
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
FB1750-500 Support Documentation FB1750-500:Ø1" IR Bandpass Filter, CWL = 1.75 µm, FWHM = 0.5 µm
FB2000-500 Support Documentation FB2000-500:Ø1" IR Bandpass Filter, CWL = 2.00 µm, FWHM = 0.5 µm
FB2250-500 Support Documentation FB2250-500:Ø1" IR Bandpass Filter, CWL = 2.25 µm, FWHM = 0.5 µm
FB2500-500 Support Documentation FB2500-500:Ø1" IR Bandpass Filter, CWL = 2.50 µm, FWHM = 0.5 µm
FB2750-500 Support Documentation FB2750-500:Ø1" IR Bandpass Filter, CWL = 2.75 µm, FWHM = 0.5 µm
FB3000-500 Support Documentation FB3000-500:Ø1" IR Bandpass Filter, CWL = 3.00 µm, FWHM = 0.5 µm
FB3250-500 Support Documentation FB3250-500:Ø1" IR Bandpass Filter, CWL = 3.25 µm, FWHM = 0.5 µm
FB3500-500 Support Documentation FB3500-500:Ø1" IR Bandpass Filter, CWL = 3.50 µm, FWHM = 0.5 µm
FB3750-500 Support Documentation FB3750-500:Ø1" IR Bandpass Filter, CWL = 3.75 µm, FWHM = 0.5 µm
Part NumberProduct Description
FB4000-500 Support Documentation FB4000-500:Ø1" IR Bandpass Filter, CWL = 4.00 µm, FWHM = 0.5 µm
FB4250-500 Support Documentation FB4250-500:Ø1" IR Bandpass Filter, CWL = 4.25 µm, FWHM = 0.5 µm
FB4500-500 Support Documentation FB4500-500:Ø1" IR Bandpass Filter, CWL = 4.50 µm, FWHM = 0.5 µm
FB4750-500 Support Documentation FB4750-500:Ø1" IR Bandpass Filter, CWL = 4.75 µm, FWHM = 0.5 µm
FB5000-500 Support Documentation FB5000-500:Ø1" IR Bandpass Filter, CWL = 5.00 µm, FWHM = 0.5 µm
FB5250-500 Support Documentation FB5250-500:Ø1" IR Bandpass Filter, CWL = 5.25 µm, FWHM = 0.5 µm
FB5500-500 Support Documentation FB5500-500:Ø1" IR Bandpass Filter, CWL = 5.50 µm, FWHM = 0.5 µm
FB5750-500 Support Documentation FB5750-500:Ø1" IR Bandpass Filter, CWL = 5.75 µm, FWHM = 0.5 µm
FB6000-500 Support Documentation FB6000-500:Ø1" IR Bandpass Filter, CWL = 6.00 µm, FWHM = 0.5 µm

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Ø1" IR Bandpass Filters

Item #CWLaFWHMbT (Min)cBlockingTransmission/
OD Datad
SubstrateCAeThickness
FB1750-500 1.75 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info N-BK7 Ø21 mm 6.1 mm
FB2000-500 2.00 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB2250-500 2.25 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info Sapphire
FB2500-500 2.50 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB2750-500 2.75 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB3000-500 3.00 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB3250-500 3.25 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB3500-500 3.50 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB3750-500 3.75 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB4000-500 4.00 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB4250-500 4.25 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB4500-500 4.50 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB4750-500 4.75 µm 0.5 ± 0.1 µm 70% 0.2 - 12 µmf info
FB5000-500 5.00 µm 0.5 ± 0.1 µm 70% 1.8 - 9.5 µmg info Ge
FB5250-500 5.25 µm 0.5 ± 0.2 µm 75% 0.2 - 12 µmf info Si
FB5500-500 5.50 µm 0.5 ± 0.1 µm 70% 1.8 - 9.5 µmg info Ge
FB5750-500 5.75 µm 0.5 ± 0.1 µm 70% 1.8 - 9.5 µmg info
FB6000-500 6.00 µm 0.5 ± 0.1 µm 70% 1.8 - 9.5 µmg info
  • Center Wavelength (CWL); Tolerance: ±50 nm
  • Full Width Half Max
  • Peak Transmission at Center Wavelength
  • Click on More Info Icon for a plot and downloadable data. Measured data accounts for all losses including Fresnel reflections. Please keep in mind that the data given in the plots is typical, and performance may vary from lot to lot.
  • Clear Aperture
  • Transmission <0.1% (Absolute)
  • Transmission <0.1% (Average)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
FB1750-500 Support Documentation
FB1750-500Ø1" IR Bandpass Filter, CWL = 1.75 µm, FWHM = 0.5 µm
$300.00
Today
FB2000-500 Support Documentation
FB2000-500Ø1" IR Bandpass Filter, CWL = 2.00 µm, FWHM = 0.5 µm
$300.00
Today
FB2250-500 Support Documentation
FB2250-500Ø1" IR Bandpass Filter, CWL = 2.25 µm, FWHM = 0.5 µm
$300.00
Today
FB2500-500 Support Documentation
FB2500-500Ø1" IR Bandpass Filter, CWL = 2.50 µm, FWHM = 0.5 µm
$300.00
Today
FB2750-500 Support Documentation
FB2750-500Ø1" IR Bandpass Filter, CWL = 2.75 µm, FWHM = 0.5 µm
$300.00
Today
FB3000-500 Support Documentation
FB3000-500Ø1" IR Bandpass Filter, CWL = 3.00 µm, FWHM = 0.5 µm
$300.00
Today
FB3250-500 Support Documentation
FB3250-500Ø1" IR Bandpass Filter, CWL = 3.25 µm, FWHM = 0.5 µm
$300.00
Today
FB3500-500 Support Documentation
FB3500-500Ø1" IR Bandpass Filter, CWL = 3.50 µm, FWHM = 0.5 µm
$300.00
Today
FB3750-500 Support Documentation
FB3750-500Ø1" IR Bandpass Filter, CWL = 3.75 µm, FWHM = 0.5 µm
$300.00
Today
FB4000-500 Support Documentation
FB4000-500Ø1" IR Bandpass Filter, CWL = 4.00 µm, FWHM = 0.5 µm
$300.00
Today
FB4250-500 Support Documentation
FB4250-500Ø1" IR Bandpass Filter, CWL = 4.25 µm, FWHM = 0.5 µm
$300.00
Today
FB4500-500 Support Documentation
FB4500-500Ø1" IR Bandpass Filter, CWL = 4.50 µm, FWHM = 0.5 µm
$300.00
Today
FB4750-500 Support Documentation
FB4750-500Ø1" IR Bandpass Filter, CWL = 4.75 µm, FWHM = 0.5 µm
$300.00
Today
FB5000-500 Support Documentation
FB5000-500Ø1" IR Bandpass Filter, CWL = 5.00 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5250-500 Support Documentation
FB5250-500Ø1" IR Bandpass Filter, CWL = 5.25 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5500-500 Support Documentation
FB5500-500Ø1" IR Bandpass Filter, CWL = 5.50 µm, FWHM = 0.5 µm
$1,000.00
Today
FB5750-500 Support Documentation
FB5750-500Ø1" IR Bandpass Filter, CWL = 5.75 µm, FWHM = 0.5 µm
$1,000.00
Today
FB6000-500 Support Documentation
FB6000-500Ø1" IR Bandpass Filter, CWL = 6.00 µm, FWHM = 0.5 µm
$1,000.00
Today
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