Typical Transmission Plots Available for Every Filter
Thorlabs offers a wide range of BP filters from 340 to 1650 nm. Transmission curves for individual filters are available under the Documents & Drawings tab. Each filter is mounted in a black anodized aluminum ring with an external diameter of 1" (25.4 mm) and a maximum edge thickness of 6.3 mm.
Thorlabs' Bandpass Filters and Laser Line Filters (centered on common wavelengths) provide one of the simplest and most economical 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.
This type of filter displays very high transmission in the bandpass region, but the spectral range of blocked light on either side of the bandpass region is narrow. To compensate for this deficiency, an additional blocking component is added, which is either an all dielectric or a metal-dielectric depending on the requirements of the filter. Although this additional blocking component will eliminate any unwanted out-of-band radiation, it also reduces the filter's overall transmission throughput.
Please see the Tutorial tab for more information about the structure of the filter and the transmission direction arrow.
In addition to the standard bandpass filters listed below, custom filters can also be fabricated to support alternative central wavelengths or FWHM. To request a quote, please contact you local Tech Support office.
Key to Abbreviation
a) Central Wavelength b) Full Width Half Maximum
c) Transmission d) Blocking Wavelength Range
Bandpass Filters (340 - 800 nm)
Item #
CWLa (nm)
FWHMb (nm)
Tc Min (%)
Blockingd (nm)
FB340-10
340 ± 2
10 ± 2
25
200 - 1200
FB350-10
350 ± 2
10 ± 2
25
200 - 1200
FB360-10
360 ± 2
10 ± 2
25
200 - 1200
FB370-10
370 ± 2
10 ± 2
25
200 - 1200
FB380-10
380 ± 2
10 ± 2
25
200 - 1200
FB390-10
390 ± 2
10 ± 2
30
200 - 1200
FB400-10
400 ± 2
10 ± 2
37
200 - 1200
FB400-40
400 ± 8
40 ± 8
45
200 - 1150
FB405-10
405 ± 2
10 ± 2
37
200 - 1200
FB410-10
410 ± 2
10 ± 2
40
200 - 1200
FB420-10
420 ± 2
10 ± 2
45
200 - 1200
FB430-10
430 ± 2
10 ± 2
45
200 - 1200
FB440-10
440 ± 2
10 ± 2
45
200 - 1200
FB450-10
450 ± 2
10 ± 2
45
200 - 1200
FB450-40
450 ± 8
40 ± 8
60
200 - 1150
FB460-10
460 ± 2
10 ± 2
45
200 - 1200
FB470-10
470 ± 2
10 ± 2
45
200 - 1200
FB480-10
480 ± 2
10 ± 2
45
200 - 1200
FB490-10
490 ± 2
10 ± 2
45
200 - 1200
FB500-10
500 ± 2
10 ± 2
50
200 - 1200
FB500-40
500 ± 8
40 ± 8
70
200 - 1150
FB510-10
510 ± 2
10 ± 2
50
200 - 1200
FB520-10
520 ± 2
10 ± 2
50
200 - 1200
FB530-10
530 ± 2
10 ± 2
50
200 - 1200
FB540-10
540 ± 2
10 ± 2
50
200 - 1200
FB550-10
550 ± 2
10 ± 2
50
200 - 1200
FB550-40
550 ± 8
40 ± 8
75
200 - 1150
FB560-10
560 ± 2
10 ± 2
50
200 - 1200
FB570-10
570 ± 2
10 ± 2
50
200 - 1200
FB580-10
580 ± 2
10 ± 2
50
200 - 1200
FB590-10
590 ± 2
10 ± 2
50
200 - 1200
FB600-10
600 ± 2
10 ± 2
50
200 - 1200
FB600-40
600 ± 8
40 ± 8
75
200 - 1150
FB610-10
610 ± 2
10 ± 2
50
200 - 1200
FB620-10
620 ± 2
10 ± 2
50
200 - 1200
FB630-10
630 ± 2
10 ± 2
50
200 - 1200
FB640-10
640 ± 2
10 ± 2
50
200 - 1200
FB650-10
650 ± 2
10 ± 2
50
200 - 1200
FB650-40
650 ± 8
40 ± 8
75
200 - 1150
FB660-10
660 ± 2
10 ± 2
50
200 - 1200
FB670-10
670 ± 2
10 ± 2
50
200 - 1200
FB680-10
680 ± 2
10 ± 2
50
200 - 1200
FB690-10
690 ± 2
10 ± 2
50
200 - 1200
FB700-10
700 ± 2
10 ± 2
50
200 - 1200
FB700-40
700 ± 8
40 ± 8
75
200 - 1150
FB710-10
710 ± 2
10 ± 2
50
200 - 1200
FB720-10
720 ± 2
10 ± 2
50
200 - 1200
FB730-10
730 ± 2
10 ± 2
50
200 - 1200
FB740-10
740 ± 2
10 ± 2
50
200 - 1200
FB750-10
750 ± 2
10 ± 2
50
200 - 1200
FB750-40
750 ± 8
40 ± 8
75
200 - 1150
FB760-10
760 ± 2
10 ± 2
50
200 - 1200
FB770-10
770 ± 2
10 ± 2
50
200 - 1200
FB780-10
780 ± 2
10 ± 2
50
200 - 1200
FB790-10
790 ± 2
10 ± 2
50
200 - 1200
FB800-10
800 ± 2
10 ± 2
50
200 - 1200
FB800-40
800 ± 8
40 ± 8
75
200 - 1150
Bandpass Filters (810 - 1650 nm)
Item #
CWLa (nm)
FWHMb (nm)
Tc Min (%)
Blockingd (nm)
FB810-10
810 ± 2
10 ± 2
50
200 - 1200
FB820-10
820 ± 2
10 ± 2
50
200 - 1200
FB830-10
830 ± 2
10 ± 2
50
200 - 1200
FB840-10
840 ± 2
10 ± 2
50
200 - 1200
FB850-10
850 ± 2
10 ± 2
50
200 - 1200
FB850-40
850 ± 8
40 ± 8
75
200 - 1150
FB860-10
860 ± 2
10 ± 2
50
200 - 1200
FB870-10
870 ± 2
10 ± 2
50
200 - 1200
FB880-10
880 ± 2
10 ± 2
50
200 - 1200
FB880-40
880 ± 8
40 ± 8
70
200 - 1150
FB880-70
880 ± 8
70 ± 8
70
200 - 1150
FB890-10
890 ± 2
10 ± 2
50
200 - 1200
FB900-10
900 ± 2
10 ± 2
50
200 - 1200
FB900-40
900 ± 8
40 ± 8
70
200 - 1150
FB910-10
910 ± 2
10 ± 2
50
200 - 1200
FB920-10
920 ± 2
10 ± 2
50
200 - 1200
FB930-10
930 ± 2
10 ± 2
50
200 - 1200
FB940-10
940 ± 2
10 ± 2
50
200 - 1200
FB950-10
950 ± 2
10 ± 2
50
200 - 1200
FB960-10
960 ± 2
10 ± 2
50
200 - 1200
FB970-10
970 ± 2
10 ± 2
50
200 - 1200
FB980-10
980 ± 2
10 ± 2
50
200 - 1200
FB990-10
990 ± 2
10 ± 2
50
200 - 1200
FB1000-10
1000 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1050-10
1050 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1100-10
1100 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1150-10
1150 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1200-10
1200 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1250-10
1250 ± 2
10 ± 2
45
0.2 - 3.0 µm
FB1300-12
1300 ± 2.4
12 ± 2.4
40
0.2 - 3.0 µm
FB1300-30
1300 ± 6
30 ± 6
45
0.2 - 3.0 µm
FB1310-12
1310 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1320-12
1320 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1330-12
1330 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1340-12
1340 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1350-12
1350 ± 2.4
12 ± 2.4
35
0.2 - 3.0 µm
FB1400-12
1400 ± 2.4
12 ± 2.4
35
0.2 - 3.0 µm
FB1450-12
1450 ± 2.4
12 ± 2.4
35
0.2 - 3.0 µm
FB1480-12
1480 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1490-12
1490 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1500-12
1500 ± 2.4
12 ± 2.4
35
200 - 1850
FB1510-12
1510 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1520-12
1520 ± 2
12 ± 2
50
0.2 - 3.5 µm
FB1530-12
1530 ± 2
12 ± 2
50
200 - 1850
FB1540-12
1540 ± 2
12 ± 2
50
200 - 1850
FB1550-12
1550 ± 2.4
12 ± 2.4
50
200 - 1850
FB1550-30
1550 ± 6
30 ± 6
45
200 - 1850
FB1560-12
1560 ± 2
12 ± 2
50
200 - 1850
FB1570-12
1570 ± 2
12 ± 2
50
200 - 1850
FB1580-12
1580 ± 2
12 ± 2
50
200 - 1850
FB1590-12
1590 ± 2
12 ± 2
50
200 - 1850
FB1550-40
1550 ± 2.4
40 ± 8
45
200 - 1850
FB1600-12
1600 ± 2.4
12 ± 2.4
50
200 - 1850
FB1610-12
1610 ± 2
12 ± 2
50
200 - 1850
FB1620-12
1620 ± 2
12 ± 2
50
200 - 1850
FB1650-12
1650 ± 2.4
12 ± 2.4
50
200 - 1850
Common Specifications
Out of Band Transmission
<0.01%
Filter Housing Diameter (Tolerance)
25.4 +0.0 / -0.2 mm
Minimum Clear Aperture
Ø21 mm
Thickness
<6.3 mm
Optimum Operating Temperature
23 °C
Operating Temperature
-50 to 80 °C
Edge Treatment
Mounted in Black Anodized Aluminum Ring
Edge Markings
CWL-FWHM ↑ Lot Number; The Arrow Points in the Direction of the light transmission
Surface/Coating Quality
80-50 Scratch-Dig
Substrates
Schott Borofloat and Soda Lime
Bandpass Filter Structure
A bandpass filter is created by depositing layers of material on the surface of the substrate. Typically, there are several dielectric stacks separated by spacer layers. The dielectric stack is composed of a large number of alternating layers of low-index and high-index dielectric 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 dielectric stacks and have a thickness of (nλ)/2, where n is an integer. The spacer layers can be formed from colored glass, epoxy, dyes, metallic, or dielectric layers. 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.
The number of layers shown in this schematic is not indicative of the number of layers in an actual bandpass filter. Also the drawing is not to scale.
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. In order increase the blocking range of the filter, materials with broad blocking ranges are used for or coated onto the spacer layers and the substrate. 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. Although the filter will function with either side facing the source, it is better to place the coated side toward the source. This will minimize any thermal effects or possible thermal damage that blocking intense out-of-band radiation might cause due to the absorption of the out-of-band radiation by the substrate or colored glass filter layers. The plot to the right 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 and 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 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.
FB800-10 and FB800-40 filters were used to make the measurement that resulted in the plot above.
Filter Temperature
The central wavelength of the bandpass filter can be tuned slightly (~1 nm over the operating range of the filter) by changing the temperature of the filter. This is primarily due to the slight thermal expansion or contraction of the layers.
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Posted Comments:
Poster: jjurado
Posted Date: 2010-06-01 14:44:20.0
Response from Javier at Thorlabs to last poster: The filter coating is designed so that only the specified band is transmitted, and the transmission at the rejection range (200-1200nm for the FB450 filter, for example) is kept at a minimum (< 0.01%). As mentioned in the Tutorial section, 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. We can provide sample scans of these filter if you would like.
Poster:
Posted Date: 2010-06-01 12:54:07.0
Is there a second order that comes thru? If I use a filter at 450 nm is there light at 900 nm that is transmitted?
Poster: apalmentieri
Posted Date: 2010-02-19 19:25:56.0
A response from Adam at Thorlabs to Luis: We can provide customer transmission vs. wavelength curves for our customers. I will contact you directly to get information about the wavelength range and AOIs needed.
Poster: Luis.CerveroGallart
Posted Date: 2010-02-19 09:43:03.0
Is it possible to have transmission versus wavelength curves for different angles not normally incident to the surface? Interesting would be the curves for the FB850-10, FB850-40, FB950-10 and FB950-40 and if possible over the whole angle range from 0 to 90 degrees. Thanks! Luis
Poster: apalmentieri
Posted Date: 2010-01-27 09:51:43.0
A response from Adam at Thorlabs: To determine the dB for these curves you can use the formula
Attenuation(dB) = 10 * Log(1/%T)
I have already modified curves for the FB500-40 and FES1000 and will send them to you shortly.
Poster: delaune
Posted Date: 2010-01-26 20:20:33.0
Dear Sir,
Beginner in the optical field, I wish to know the attenuation value (in dB) of the FB500-40 & FES1000 that were purchased some time ago. Is possible to determine this value from the transmission graph shown in the documents&drawings part? Thanks for the answers.
Poster: apalmentieri
Posted Date: 2010-01-06 09:50:12.0
A response from Adam at Thorlabs to Marc: It is possible to get transmission data files. I will email you direct with some files.
Poster: mverhaegen
Posted Date: 2010-01-06 08:37:15.0
Is it possible to have transmission data file of one of your FBxxx-10 filter? Whatever central wavelength between 400 and 1000nm.
Thank you,
Marc Verhaegen
CTO, Photon etc.
Poster: apalmentieri
Posted Date: 2009-11-17 11:11:39.0
A response from Adam at Thorlabs: Michael, I believe we have this data and I will send it to your email address.
Poster: michael.spurr
Posted Date: 2009-11-17 05:02:23.0
As with the post by mary.breeden, would it be possible to have transmission data for the following filters:
FB405-10
FB420-10
FB440-10
Many thanks, Michael
Poster: klee
Posted Date: 2009-10-28 13:34:32.0
A response from Ken at Thorlabs to kettle: We may be able to do this but we will need more information. Please send a drawing to techsupport@thorlabs.com so that we can take a look.
Poster: kettle
Posted Date: 2009-10-27 18:44:18.0
Dear Sir, I am looking for narrow bandpass filters like FB450-10 for underwater applications. It is important that the filter be 1.5-2" square with holes drilled in the corners. Do you carry a product like this or know where I can get one?
Sincerely,
Anthony Kettle
Poster: klee
Posted Date: 2009-07-13 10:23:29.0
A response from Ken at Thorlabs to SergeyKostrov: The Tutorial can be seen by clicking on the tab within this page. It can not be seen in a separate window/tab.
Poster: SergeyKostrov
Posted Date: 2009-07-11 14:00:37.0
A Web-Link to Tutorial
http://www.thorlabs.com/1001Tutorial
is broken
Poster: apalmentieri
Posted Date: 2009-07-09 11:35:32.0
A response from Adam at Thorlabs: Currently, we do not have the transmission information for these filters all the out to 10um. We can only provide experimental scans out to 3um. I will contact you directly to find out more about the information you are looking for.
Poster: emily.peterson
Posted Date: 2009-07-06 11:37:22.0
I am interested to know the IR transmission of these filters in the 2-10 micron range. I am using the 1650-12 nm filter, as well as 1550, 1450, 1200, 1050.
Poster: klee
Posted Date: 2009-06-24 11:18:46.0
A response from Ken at Thorlabs to s.obyrne: We do carry 1/2" Laser Line filters for certain wavelengths. You can click on the Laser Line Filters under the Related Products above to get to see what wavelengths we have. If you do not find the wavelength you need, send an email to techsupport@thorlabs.com and we will send you a quote for the custom 1/2" filter(s).
Poster: s.obyrne
Posted Date: 2009-06-24 05:41:56.0
Are you going to make a 1/2" version of these for use in the 30 mm cage assemblies. You have 1/2" filter holders, but no filters!
Poster: Tyler
Posted Date: 2008-09-12 15:20:53.0
A response from Tyler at Thorlabs to mary.breeden: A member of the technical support staff will email the data files that you requested. Thank you for using our products. If you have any additional inquires, please let us know.
Poster: mary.breeden
Posted Date: 2008-09-08 15:03:24.0
I recently purchased the visible (10nm) and IR filter kits. Is it possible to get the transmission data (other than the graphs available in the Drawings & Documents area) so that I can accuratly portray them in Zemax? Any MS Office file format (including 2007) would be suitable.
Thanks!
Mary
Poster: technicalmarketing
Posted Date: 2008-02-21 15:49:28.0
Thorlabs has not currently tested that bandpass filter in order to determine its damage threshold. Please contact our technical support staff to discuss whether the filter is a feasible choice for your application.
Poster: ganyi820
Posted Date: 2008-02-18 15:18:31.0
Hello,
May I know the intensity damage threshold for your bandpass filters (FB550-40)?
Thanks
( 0)
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The number of layers shown in this schematic is not indicative of the number of layers in an actual bandpass filter. Also the drawing is not to scale.
FB340-10
- Bandpass Filter, CWL = 340 nm, FWHM = 10 nm
