Bandpass Filter Kits


  • Visible Kit, 10 nm Bandpass: 10 Center Wavelengths from 351 to 800 nm
  • Visible Kit, 40 nm Bandpass: 10 Center Wavelengths from 400 to 850 nm
  • IR Kit, 10 - 12 nm Bandpass: 10 Center Wavelengths from 850 to 1600 nm

FKBIR10

IR Filter Kit

10-12 nm FWHM

CWL = 600 nm
FWHM = 40 nm

CWL = 1100 nm
FWHM = 10 nm

CWL = 700 nm
FWHM = 10 nm

FKBV40

Visible Filter Kit

40 nm FWHM

Related Items


Please Wait

IR Filter Mounted in Filter Mount
Click to Enlarge

Premium Hard-Coated Bandpass Filter Dimensions



IR Filter Mounted in Filter Mount
Click to Enlarge

Our premium hard-coated bandpass filter
engraving and transmission is shown above.
Please note that the transmission direction only affects backscatter and reflection, not filter performance.

Features

  • Visible Bandpass Filter Kits
    • Item # FKBV10: 351 to 800 nm Center Wavelengths, 10 nm FWHM
    • Item # FKBV40: 400 to 850 nm Center Wavelengths, 40 nm FWHM
  • IR Bandpass Filter Kit
    • Item # FKBIR10: 850 to 1600 nm Center Wavelengths, 10 nm or 12 nm FWHM (Filter Dependent)
  • Engraved Filter Mount with Ø25 mm Ring

Thorlabs' Bandpass Filter Kits each contain 10 mounted bandpass filters that can be used to transmit a well-defined wavelength band in the visible or IR, while rejecting other unwanted radiation. The bandpass filter kits include a selection of our Premium Hard-Coated Bandpass Filters.


IR Filter Mounted in Filter Mount
Click to Enlarge

FBH700-10 Filter Mounted in a TRF90 Flip Mount Using a Retaining Ring

Our premium hard-coated bandpass filters provide higher transmission, steeper cut on and cut off slopes, greater blocking, and increased durability when compared to our standard line of bandpass filters. The hard-coated filters are 3.5 mm thick, which allows the Ø25 mm filters to be used as drop-in replacements for our fluorescence emission filters.

Each filter is mounted in an unthreaded Ø25 mm ring that can be placed into our selection of Ø1" lens tubes and filter mounts using retaining rings, as shown to the left. The filter kits come in a convenient plastic box for storage and transportation purposes. Please see the Tutorial tab for more information about the structure of the hard-coated bandpass filters.

Thorlabs also offers a wide range of individually sold bandpass filters. To inquire about our custom bandpass filter options, including the possibility of alternative central wavelengths or bandwidths, please contact Tech Support. Please note that there is a significant lead time and tooling cost associated with custom filters that makes the purchase of only a few pieces fairly costly.

Additional Bandpass Filters
UV/Visible Bandpass Filters
340 - 694.3 nm CWLs
NIR Bandpass Filters
700 - 1650 nm CWLs
MIR Bandpass Filters
1750 - 12000 nm CWLs
Premium Bandpass Filters
300 - 1600 nm CWLs
Bandpass Filter Kits
We also offer custom bandpass filters with other central wavelengths or FWHM. To request a quote, contact Tech Support.
General Specifications
Kit Type Hard-Coated Bandpass Filter Kits
(Item #s FKBV10, FKBV40, and FKBIR10)
Bandpass Filter Type Premium Hard-Coated
Out of Band
Optical Density
ODavg ≥ 4 (351 nm CWL)
ODabs > 5 (CWLs ≥ 400 nm)
Clear Aperture Ø21.1 mm
Thickness 3.5 mm
Surface Quality 60-40 Scratch-Dig
Coating Hard Coated
Operating
Temperature
-40 to 90 °Ca
Edge Treatment Mounted in Black
Anodized Aluminum Ring
Edge Markingsb Item #
Substrate(s) UV Fused Silicac
Damage Threshold Not Specified
  • Operating temperature is limited by the epoxy. Please contact Tech Support if your application involves temperatures outside of this range.
  • The engraved arrow points in the direction of light transmission.
  • Click to view detailed substrate specifications.

Hard-Coated Bandpass Filter Structure

Bandpas Filter Layers
Click to Enlarge

The number of layers shown in this schematic is not indicative of the number of layers in an actual hard-coated bandpass filter. Also the drawing is not to scale.

A bandpass filter is created by depositing layers of material on the surface of the substrate. For our hard-coated bandpass filters, dielectric stacks alternating with dielectric spacer layers comprise the thin filter coating stack. Each dielectric stack is composed of a large number of alternating layers of low-index and high-index material. The thickness of each layer in the dielectric stack is λ/4, where λ is the central wavelength of the bandpass filter (i.e. the wavelength with the highest transmittance through the filter). The spacer layers are placed in between the stacks and have a thickness of (nλ)/2, where n is an integer. A Fabry-Perot cavity is formed by each spacer layer sandwiched between dielectric stacks. The filter is mounted in an engraved metal ring for protection and ease of handling.

Filter Operation Overview

The constructive interference conditions of a Fabry-Perot cavity allow light at the central wavelength, and a small band of wavelengths to either side, to be transmitted efficiently, while destructive interference prevents the light outside the passband from being transmitted. However, the band of blocked wavelengths on either side of the central wavelength is small. To increase the blocking range of the filter, the substrate uses or has its spacer layers coated in materials with broad blocking ranges. Although these materials effectively block out-of-band transmission of incident radiation, they also decrease the transmission through the filter in the passband.

Filter Orientation

An engraved arrow on the edge of the filter is used to indicate the recommended direction for the transmission of light through the filter. Orienting the coated side toward the source will reduce unwanted scattering and minimize reflections sent back toward the source. Using the filter in the opposite orientation will not, however, significantly affect the performance of the filter. The plot to the bottom left was made by illuminating the filter with a low intensity broadband light and measuring the transmission as a function of wavelength. The plot shows that the transmission direction through the filter has very little effect on the intensity and the spectrum of the light transmitted through the filter. The minimal variation between the forward and backward traces is most likely due to a small shift in the incident angle of the light on the filter introduced when the filter was removed, flipped over, and replaced in the jig.

The filter is intended to be used with collimated light normally incident on the surface of the filter. For uncollimated light or light striking the surface at an angle not normally incident to the surface, the central wavelength (wavelength corresponding to peak transmission) will shift toward lower wavelengths and the shape of the transmission region (passband) will change. Varying the angle of incidence (AOI) by a small amount can be used to effectively tune the passband over a narrow range. Large changes in the incident angle will cause larger shifts in the central wavelength but will also significantly distort the shape of the passband and, more importantly, cause a significant decrease in the transmittance of the passband, as seen in the plot to the bottom right.

Bandpas Filter Layers
Click to Enlarge

This plot displays transmission forward and backward through the FBH800-10 Premium Bandpass Filter and the FBH800-40 Premium Bandpass Filter.
Bandpas Filter Layers
Click to Enlarge

This plot displays transmission through the FBH800-10 Premium Bandpass Filter at varying angles of incidence (AOI).

Posted Comments:
tebeech  (posted 2014-03-05 04:53:36.227)
Despite the fact that a filter wheel is displayed as a "related item" along the sidebar, the mounted bandpass filters are too thick to be mounted in such a device. Specifically, we purchased the visible bandpass filter kit FKB-VIS-10 and attempted to mount the filters in a FW1A. The thickness of the filters exceeds the thickness of the filter wheel mount and as such there is no way of affixing the filters in place. It is remarkable to me that a thorlabs filter cannot be mounted in a thorlabs filter wheel. Such basic must have been tested and as yet I am forced to purchase additional items to achieve basic functionality.
jlow  (posted 2014-03-05 10:48:15.0)
Response from Jeremy at Thorlabs: I apologize for this mistake on our website. We have removed the thin filter wheels from the related items. To mount the filters to FW1A, you would need to get SM1L05. I will contact you directly about this.

Visible Hard-Coated Bandpass Filter Kit, 10 nm FWHM

Item #a Center Wavelength
(Transmissionb)
FWHM Blocking Regions (Optical Density) Transmission
Datac
FBH351-10 351 nm (T ≥ 85%) 10 nm 200 - 388.10 nm, 364.14 - 1200 nm (ODavg ≥ 4) info
FBH400-10 400 nm (T > 90%) 10 nm 200 - 389 nm, 411 - 1200 nm (ODabs > 5) info
FBH450-10 450 nm (T > 90%) 10 nm 200 - 430 nm, 470 - 1200 nm (ODabs > 5) info
FBH500-10 500 nm (T > 90%) 10 nm 200 - 487 nm, 512 - 1200 nm (ODabs > 5) info
FBH550-10 550 nm (T > 90%) 10 nm 200 - 536 nm, 564 - 1200 nm (ODabs > 5) info
FBH600-10 600 nm (T > 90%) 10 nm 200 - 586 nm, 614 - 1200 nm (ODabs > 5) info
FBH650-10 650 nm (T > 90%) 10 nm 200 - 630 nm, 670 - 1200 nm (ODabs > 5) info
FBH700-10 700 nm (T > 90%) 10 nm 200 - 684 nm, 716 - 1200 nm (ODabs > 5) info
FBH750-10 750 nm (T > 90%) 10 nm 200 - 733 nm, 766 - 1200 nm (ODabs > 5) info
FBH800-10 800 nm (T > 90%) 10 nm 200 - 771 nm, 829 - 1200 nm (ODabs > 5) info
  • All specifications are valid for 0° AOI.
  • Transmission at Center Wavelength
  • Click on More Info Icon for a plot and downloadable data. Please note that transmission is only guaranteed for the specified center wavelength and that the data in the plots is typical. Performance may vary from lot to lot.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FKBV10 Support Documentation
FKBV10Visible Hard-Coated Bandpass Filter Kit (10 nm FWHM), Mounted, Set of 10
$1,406.82
7-10 Days

Visible Hard-Coated Bandpass Filter Kit, 40 nm FWHM

Item #a Center Wavelength
(Transmissionb)
FWHM Blocking Regions (Optical Density) Transmission
Datac
FBH400-40 400 nm (T > 90%) 40 nm 200 - 368 nm, 433 - 1200 nm (ODabs > 5) info
FBH450-40 450 nm (T > 90%) 40 nm 200 - 423 nm, 477 - 1200 nm (ODabs > 5) info
FBH500-40 500 nm (T > 90%) 40 nm 200 - 472 nm, 527 - 1200 nm (ODabs > 5) info
FBH550-40 550 nm (T > 90%) 40 nm 200 - 521 nm, 578 - 1200 nm (ODabs > 5) info
FBH600-40 600 nm (T > 90%) 40 nm 200 - 571 nm, 629 - 1200 nm (ODabs > 5) info
FBH650-40 650 nm (T > 90%) 40 nm 200 - 611 nm, 690 - 1200 nm (ODabs > 5) info
FBH700-40 700 nm (T > 90%) 40 nm 200 - 669 nm, 730 - 1200 nm (ODabs > 5) info
FBH750-40 750 nm (T > 90%) 40 nm 200 - 718 nm, 781 - 1200 nm (ODabs > 5) info
FBH800-40 800 nm (T > 90%) 40 nm 200 - 757 nm, 845 - 1200 nm (ODabs > 5) info
FBH850-40 850 nm (T > 90%) 40 nm 200 - 805 nm, 896 - 1200 nm (ODabs > 5) info
  • All specifications are valid for 0° AOI.
  • Transmission at Center Wavelength
  • Click on More Info Icon for a plot and downloadable data. Please note that transmission is only guaranteed for the specified center wavelength and that the data in the plots is typical. Performance may vary from lot to lot.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FKBV40 Support Documentation
FKBV40Visible Hard-Coated Bandpass Filter Kit (40 nm FWHM), Mounted, Set of 10
$1,383.75
Today

IR Hard-Coated Bandpass Filter Kit, 10-12 nm FWHM

Item #a Center Wavelength
(Transmissionb)
FWHM Blocking Regions (Optical Density) Transmission
Datac
FBH850-10 850 (T > 90%) 10 nm 200 - 830 nm, 870 - 1200 nm (ODabs > 5) info
FBH900-10 900 (T > 90%) 10 nm 200 - 881 nm, 918 - 1200 nm (ODabs > 5) info
FBH1000-10 1000 (T > 90%) 10 nm 200 - 980 nm, 1020 - 1200 nm (ODabs > 5) info
FBH1100-10 1100 (T > 90%) 10 nm 200 - 1064 nm, 1138 - 1800 nm (ODabs > 5) info
FBH1200-10 1200 (T > 90%) 10 nm 200 - 1180 nm, 1220 - 1700 nm (ODabs > 5) info
FBH1300-12 1300 (T > 90%) 12 nm 200 - 1255 nm, 1345 - 1800 nm (ODabs > 5) info
FBH1400-12 1400 (T > 85%) 12 nm 200 - 1352 nm, 1450 - 1800 nm (ODabs > 5) info
FBH1500-12 1500 (T > 85%) 12 nm 200 - 1449 nm, 1551 - 1800 nm (ODabs > 5) info
FBH1550-12 1550 (T > 90%) 12 nm 200 - 1530 nm, 1570 - 1700 nm (ODabs > 5) info
FBH1600-12 1600 (T > 90%) 12 nm 200 - 1550 nm, 1652 - 1800 nm (ODabs > 5) info
  • All specifications are valid for AOI = 0°.
  • Transmission at Center Wavelength
  • Click on More Info Icon for a plot and downloadable data. Please note that transmission is only guaranteed for the specified center wavelength and that the data in the plots is typical. Performance may vary from lot to lot.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FKBIR10 Support Documentation
FKBIR10NEW!IR Hard-Coated Bandpass Filter Kit (10 -12 nm FWHM), Mounted, Set of 10
$1,383.75
Today