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Notch Filters


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Notch Filters

Common Specifications
Transmission in PassbandsTavg > 90%
Peak Optical Density in Blocking Region>6.0
Clear ApertureØ21 mm
Center Wavelength Tolerance±2 nm
Surface Quality60-40 (Scratch-Dig)
Transmitted Wavefront Error (@ 633 nm)<λ/2
Angle of Incidencea
CoatingDielectric Stack on Front Surface
HousingBlack-Anodized Lens Cell
  • Notch filters are designed for use at normal incidence but will function within the specifications stated above for an AOI of 0 ± 3°.
Availabe Center Wavelength Options
Item #Center WavelengthDiameter
NF405-13405 nm25 mm
NF488-15488 nm1"
NF514-17514 nm25 mm
NF533-17533 nm25 mm
NF561-18561 nm25 mm
NF594-23594 nm25 mm
NF633-25633 nm1"
NF658-26658 nm25 mm
NF785-33785 nm1"
NF808-34808 nm25 mm
NF980-41980 nm25 mm
NF1064-441064 nm1"

Features

  • Choose from 12 Center Wavelength Options
  • Ø1" and Ø25 mm Filters Avaliable
  • Peak Optical Density in Blocking Region: >6.0 (T < 0.0001%)
  • Dielectric Stack on Polished Glass Substrate
  • Compatible with Thorlabs' Filter Mounts and Filter Wheels

Notch filters, also commonly referred to as band-stop or band-rejection filters, are designed to transmit most wavelengths with little intensity loss while attenuating light within a specific wavelength range (the stop band) to a very low level. They are essentially the inverse of bandpass filters, which offer high in-band transmission and high out-of-band rejection so as to only transmit light within a small wavelength range.

Notch filters are useful in applications where one needs to block light from a laser. For instance, to obtain good signal-to-noise ratios in Raman spectroscopy experiments, it is critical that light from the pump laser be blocked. This is achieved by placing a notch filter in the detection channel of the setup. In addition to spectroscopy, notch filters are commonly used in laser-based fluorescence instrumentation and biomedical laser systems.

As with all dielectric stack filters, the transmission is dependent on the angle of incidence. The central wavelength of the blocking region will shift to shorter wavelengths as the angle of incidence is increased. Please see the Transmission Graphs Tab for measured transmission data for each individual filter. Additionally, plots of the meausured Optical Density (OD) of these filters in the blocking region may be found on the OD Graphs tab.

Thorlabs' notch filters feature a dielectric coating on a polished glass substrate, which has excellent environmental durability. The dielectric stack provides high rejection through destructive interference and reflection in the stop band: the optical density is greater than 6.0 (corresponding to a transmission less than 0.0001%) within the stop band. We currently offer filters with central stop-band wavelengths of 405, 488, 514, 533, 561, 594, 633, 658, 785, 808, 980, or 1064 nm. Regardless of the filter chosen, the transmitted beam's wavefront error for light at normal incidence will be less than λ/2 at 633 nm. These filters also have an AR coating on the back surface to ensure >90% average transmission within the passing bands.

Each filter is housed in a black anodized aluminum ring that is labeled with an arrow indicating the design propagation direction. The ring makes handling easier and enhances the blocking OD by limiting scattering. These filters can be mounted in our extensive line of filter mounts and wheels. We do not recommend removing the filter from its mount as the risk of damaging the filter is very high. However, custom unmounted filters are available; please contact Tech Support for more details.

Optical Coatings and Substrates
Optic Cleaning Tutorial

Below are transmission plots for our notch filters, obtained at normal incidence. Although designed for use at normal incidence, the performance of these filters will not vary significantly if used within an AOI of ±3°, but the performance may differ slightly from that shown below. Please note that this measured data presented is typical, and performace may vary from lot to lot, especially outside of the specified wavelength range of each filter.

Our 633 nm filter (NF633-25) has a plot of the transmission as a function of the angle of incidence; this plot can be used as an example of how the center wavelength varies with AOI.

Plots of the Optical Density in the blocking region may be found on the OD Graphs tab above.

NF405-13 Transmission
Click to Enlarge
Click Here for a Raw Data File with Extended Range
NF488-15 Transmission
Click to Enlarge
Click Here for a Raw Data File with Extended Range
NF514-17 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF533-17 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF561-18 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF594-23 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF658-26 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF785-33 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF808-34 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF980-41 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range
NF1064-44 Transmission
Click to Enlarge

Click Here for a Raw Data File with Extended Range

The plots below detail the optical density in the blocking region of our notch filters. Please note that this measured data presented is typical, and performace may vary from lot to lot, especially outside of the specified wavelength range of each filter.

For plots of % transmission vs. wavelength, please see the Transmission Graphs tab above.

Optical Density (OD) is related to transmission by the following relationship:

OD equation

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Posted Comments:
Poster: Klaus.Bergner
Posted Date: 2014-10-16 14:27:01.613
Hi Thorlabs-Team, would it be possible to get a Notch filter for 1026nm (1030+-40nm or so)?
Poster: jlow
Posted Date: 2014-01-17 08:36:52.0
Response from Jeremy at Thorlabs: The transmission scan data (from 200nm to 2600nm) can be found in the link under the graph or http://www.thorlabs.com/images/TabImages/NF533-17_Transmission.xlsx.
Poster:
Posted Date: 2014-01-16 23:31:14.647
Hi support, I was wondering if you had a transmission graph for the 533 nm notch filter that extends into the 850 nm range?
Poster: bob
Posted Date: 2013-06-13 06:02:55.037
Hello support, We were looking at notch coatings, like for example NF405-13. We were wondering if you can make similar passband coatings on our laser diodes. However, we would ask for coatings at 1550 nm, with a width of 15 nm. Thanks for your time, B. van Someren
Poster: tcohen
Posted Date: 2013-06-13 12:50:00.0
Response from Tim at Thorlabs: Thank you for your inquiry. We can offer many custom optics and I will contact you to discuss your requirements.
Poster: pf275
Posted Date: 2013-06-04 05:36:23.63
What is the transmisivity of the NF808-34 down to 400nm?
Poster: jlow
Posted Date: 2013-06-04 10:10:00.0
Response from Jeremy at Thorlabs: The NF808-34 transmission falls off rapidly below 600nm. At 400nm, the transmission will be close to 0%.
Poster: bdada
Posted Date: 2011-10-25 13:30:00.0
Response from Buki at Thorlabs: Thank you for your interest in Thorlabs products. We will contact you to discuss a discount and find out more about your specifications for the custom filter. Please contact TechSupport@thorlabs.com if you have further questions.
Poster: gustavo.demiguel
Posted Date: 2011-10-25 03:22:49.0
I am interested in purchasing the set of five notch filters but the price is quite high. would it be cheaper if I buy all together? Is there any possibility to design a filter with a narrower blocking peak, for example at 633 nm?
Poster: jjurado
Posted Date: 2011-08-17 18:13:00.0
Response from Javier at Thorlabs to charles.h.adams: We currently do not have concise damage threshold data for our notch filters, as the damage is highly dependent on whether the incident light is concentrated in the transmission or blocking region of the filter. Nevertheless, these filters should be able to withstand light intensities up to ~1W/cm^2.
Poster: charles.h.adams
Posted Date: 2011-08-17 11:12:03.0
What is the damage threshold for the NF1064-44 and NF533-17? Would these be appropriate for use with a nanosecond laser capable of, tens of mW/cm^2?
Poster: jjurado
Posted Date: 2011-04-04 11:53:00.0
Response from Javier at Thorlabs to Konstanze: Thank you very much for contacting us. The transmission of the NF1064-44 notch filter at 532 nm is close to 0%, so it is not suitable for your application. The FL532-10 filter would be a better match; however, at 2 W, you will most likely exceed the damage threshold of the filter, especially if the diameter of the beam is small. If possible, I would recommend attenuating the output from your laser. I will contact you directly for further support.
Poster: k.hild
Posted Date: 2011-04-04 11:19:20.0
I am interested in the notch filter to cut out the 1064 laser line. On the data sheet and in the specification it says that the transmission band starts at 800nm. I was assuming that the transmission is quite close to 100% for other wavelengths as well, but this is obviously not stated, so could you tell me what the transmission of the NF1064-44 Support Documentation NF1064-44 - Notch Filter, CWL = 1064 nm, FWHM = 44 nm filter is at 532nm (I want to use it to get most of the energy from at 532nm out of the laser but block the also produced 1064. I had also considered using a laser line filter: FL532-10 Support Documentation FL532-10 - Laser Line Filter, CWL=532 ± 2 nm, FWHM=10 ± 2 nm , but this one only lets 80% of the light through at the lasing line. As I am using a relative powerful laser (up to 2W)I am not sure I want that much heat dissapated in my filter. Regards, Konstanze
Poster: tor
Posted Date: 2010-11-19 16:28:53.0
Response from Tor at Thorlabs to kmcao: We may be able to provide custom dimensions. I will contact you directly for your specific requirements.
Poster: kmcao
Posted Date: 2010-11-19 15:26:17.0
the size can be larger as over 50mm?
Poster: Thorlabs
Posted Date: 2010-11-08 10:38:16.0
Response from Javier at Thorlabs to jcogger: in these notch filters, the rejected wavelength band is blocked through a combination of destructive interference and reflection, the level of which varies from filter to filter. I will contact you directly with pricing information and to follow up on your technical inquiry.
Poster: jcogger
Posted Date: 2010-11-08 09:40:34.0
Do these notch filters reflect or absorb the the blocked wavelength? What is quantity pricing? I would like to design these filters into my product but the piece price makes it prohibitive.
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Ø25 mm Notch Filters
Item #Center
Wavelength
FWHMa
of Blocking Region
Passbands
(Tavg > 90%)
DiameterThicknessSubstrateTransmission
Graphb
OD
Graphc
NF405-13 405 ± 2 nm 13 nm 360 - 390 nm
420 - 570 nm
25.0 mm 3.5 mm Fused Silica NF405-13 Transmission Graph NF405-13 OD Graph
NF514-17 514 ± 2 nm 17 nm 400 - 496 nm
532 - 690 nm
25.0 mm 3.5 mm Fused Silica NF514-17 Transmission Graph NF514-17 OD Graph
NF533-17 533 ± 2 nm 17 nm 400 - 517 nm
548 - 710 nm
25.0 mm 3.5 mm Fused Silica NF533-17 Transmission Graph NF533-17 OD Graph
NF561-18 561 ± 2 nm 18 nm 425 - 542 nm
580 - 740 nm
25.0 mm 3.5 mm Fused Silica NF561-18 Transmission Graph NF561-18 OD Graph
NF594-23 594 ± 2 nm 23 nm 440 - 572 nm
616 - 810 nm
25.0 mm 3.5 mm Fused Silica NF594-23 Transmission Graph NF594-23 OD Graph
NF658-26 658 ± 2 nm 26 nm 500 - 634 nm
682 - 900 nm
25.0 mm 3.5 mm Fused Silica NF658-26 Transmission Graph NF658-26 OD Graph
NF808-34 808 ± 2 nm 34 nm 610 - 778 nm
838 - 1060 nm
25.0 mm 3.5 mm Fused Silica NF808-34 Transmission Graph NF808-34 OD Graph
NF980-41 980 nm ± 2 nm 41 nm 700 - 948 nm
1012 - 1300 nm
25.0 mm 3.5 mm Fused Silica NF980-41 Transmission Graph NF980-41 OD Graph
  • Full Width at Half Maximum
  • Please See the Transmission Graphs Tab Above for Raw Transmission Data from 200 - 2600 nm
  • Please See the OD Graphs Tab Above for Raw Optical Density Data
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
NF405-13 Support Documentation
NF405-13 Customer Inspired! Ø25 mm Notch Filter, CWL = 405 nm, FWHM = 13 nm
$490.00
Today
NF514-17 Support Documentation
NF514-17 Ø25 mm Notch Filter, CWL = 514 nm, FWHM = 17 nm
$490.00
Today
NF533-17 Support Documentation
NF533-17 Ø25 mm Notch Filter, CWL = 533 nm, FWHM = 17 nm
$490.00
Today
NF561-18 Support Documentation
NF561-18 Ø25 mm Notch Filter, CWL = 561 nm, FWHM = 18 nm
$490.00
Today
NF594-23 Support Documentation
NF594-23 Ø25 mm Notch Filter, CWL = 594 nm, FWHM = 23 nm
$490.00
Today
NF658-26 Support Documentation
NF658-26 Ø25 mm Notch Filter, CWL = 658 nm, FWHM = 26 nm
$490.00
Today
NF808-34 Support Documentation
NF808-34 Customer Inspired! Ø25 mm Notch Filter, CWL = 808 nm, FWHM = 34 nm
$490.00
Today
NF980-41 Support Documentation
NF980-41 Ø25 mm Notch Filter, CWL = 980 nm, FWHM = 41 nm
$490.00
Today
Ø1" Notch Filters
Item # Center
Wavelength
FWHMa
of Blocking Region
Passbands
(Tavg > 90%)
Diameter Thickness SubstrateTransmission
Graphb
OD
Graphc
NF488-15 488 ± 2 nm 15 nm 400 - 471 nm
504 - 650 nm
1"
(25.4 mm)
1/4"
(6.3 mm)
B270 NF488-15 Transmission Graph NF488-15 OD Graph
NF633-25 633 ± 2 nm 25 nm 475 - 613 nm
653 - 900 nm
1"
(25.4 mm)
1/4"
(6.3 mm)
B270 NF633-25 Transmission Graph NF633-25 OD Graph
NF785-33 785 ± 2 nm 33 nm 590 - 760 nm
810 - 1040 nm
1"
(25.4 mm)
1/4"
(6.3 mm)
B270 NF785-33 Transmission Graph NF785-33 OD Graph
NF1064-44 1064 ± 2 nm 44 nm 800 - 1031 nm
1097 - 1400 nm
1"
(25.4 mm)
1/4"
(6.3 mm)
B270 NF1064-44 Transmission Graph NF1064-44 OD Graph
  • Full Width at Half Maximum
  • Please See the Transmission Graph Tab Above for Raw Transmission Data from 200 - 2600 nm
  • Please See the OD Graphs Tab Above for Raw Optical Density Data
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
NF488-15 Support Documentation
NF488-15 Ø1" Notch Filter, CWL = 488 nm, FWHM = 15 nm
$490.00
Today
NF633-25 Support Documentation
NF633-25 Ø1" Notch Filter, CWL = 633 nm, FWHM = 25 nm
$490.00
Today
NF785-33 Support Documentation
NF785-33 Ø1" Notch Filter, CWL = 785 nm, FWHM = 33 nm
$490.00
Today
NF1064-44 Support Documentation
NF1064-44 Ø1" Notch Filter, CWL = 1064 nm, FWHM = 44 nm
$490.00
Today
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