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Notch Filters


  • Attenuate Light Within a Specific Wavelength Range
  • Center Wavelengths from 405 nm to 1064 nm
  • Ideal for Spectroscopy Applications

NF633-25

Transmission Direction Indicator

NF405-13

NF1064-44

Notch Filter,
Cuvette Holder,
and Fiber Patch Cable

Raman
Spectroscopy
of Liquids

Related Items


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Common Specifications
Transmission in Passbands Tavg > 90%
Peak Optical Density in Blocking Region >6.0
Clear Aperture Ø21 mm
Center Wavelength Tolerance ±2 nm
Surface Quality 60-40 (Scratch-Dig)
Transmitted Wavefront Error (@ 633 nm) <λ/2
Angle of Incidencea
Coating Dielectric Stack on Front Surface
Housing Black-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°.
Available Center Wavelength Options
Item # Center Wavelength Diameter
NF405-13 405 nm 25 mm
NF488-15 488 nm 1"
NF514-17 514 nm 25 mm
NF533-17 533 nm 25 mm
NF561-18 561 nm 25 mm
NF594-23 594 nm 25 mm
NF633-25 633 nm 1"
NF658-26 658 nm 25 mm
NF785-33 785 nm 1"
NF808-34 808 nm 25 mm
NF980-41 980 nm 25 mm
NF1064-44 1064 nm 1"

Features

  • Choose from 12 Center Wavelength Options
  • Ø1" and Ø25 mm Filters Available
  • 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
  • Select Notch Filters Available in Custom Sizes; Contact Tech Support for Details

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. Above, the Transmission Graphs tab presents transmission vs. wavelength data, the OD Graphs tab presents optical density in the blocking region data, and the Spectra Graphs tab presents spectra vs. AOI data for both s- and p-polarization states of each notch filter.

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 of 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. As the mounts are not threaded, Ø1" retaining rings will be required to mount the filters in one of our internally-threaded SM1 lens tubes. We do not recommend removing the filter from its mount as the risk of damaging the filter is very high. However, select filters are available unmounted as well as in custom sizes; 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 the 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 and spectra vs. AOI may be found on the OD Graphs and AOI Graphs tabs, respectively.

NF405-13 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF488-15 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF514-17 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF533-17 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF561-18 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF594-23 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF633-25 Transmission
Click to Enlarge

Click for Angle of Incidence (AOI) Dependence Plot
Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF658-26 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF785-33 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF808-34 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF980-41 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF1064-44 Transmission
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range

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

Plots of % transmission vs. wavelength and spectra vs. AOI may be found on the Transmission Graphs and AOI Graphs tabs, respectively.

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

OD equation

NF405-13 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF488-15 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF514-17 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF533-17 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF561-18 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF594-23 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF633-25 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF658-26 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF785-33 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF808-34 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF980-41 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
NF1064-44 Optical Density
Click to Enlarge

Click Here for Raw Data for the 200 - 2600 nm Wavelength Range
Notch Filter Testing Setup
Click to Enlarge
Figure 1: Setup used to test notch filters. Light from the sources listed below were incident on a notch filter mounted on a rotation stage, and the spectra were recorded using Thorlabs' OSA201C Optical Spectrum Analyzer.
Light Source Item # Light Source Type Filters Tested
SLS201a Stabilized
Tungsten-Halogen
NF1064-44
SLS401 Xenon Short-Arc NF980-41
NF808-34
NF785-33
NF658-26
NF633-25
NF594-23
NF561-18
NF533-17
M505F1b Fiber-Coupled LED NF514-17
M470F3b Fiber-Coupled LED NF488-15
  • This is our former-generation light source, used with a free-space collimator. Similar results would be obtained using our current SLS201L light source with SLS201C collimation package.
  • The output was collimated using a RC08SMA-P01 reflective collimator.

Modeling Off-Axis Performance: Optical Spectrum Analyzer Measurements

As the angle of incidence upon a thin-film interference filter increases, a phase shift will occur between each of the transmitted rays created from successive reflections within the filter. This will shift the filter's center wavelength downward, which can be modeled as:

(1)

Tilted Filter Center Wavelength

where λ is the center wavelength at an incident angle of θ0, λ0 is the center wavelength at normal incidence, and n* is the effective index of refraction. The center wavelength shift of a multilayer interference filter can be characterized as equivalent to a monolayer with this effective index, which is between the high-index and low-index values for the thin films of the interference filter stack. The effective index can be experimentally determined from measurements of filter spectral transmission at various incident angles; the model is generally valid at small angles, but can work up to ~40° depending on the filter's structure. [1-2]

Measurements of filter transmission were made using the setup shown in Figure 1. The setup consisted of several Thorlabs' light sources (listed in the table under the Figure 1) in order to measure filters with center wavelengths ranging from 488 nm to 1064 nm. The spectral output from each filter was detected with our OSA201C optical spectrum analyzer. The filter was mounted in an LH1 adjustable lens mount mounted on an RP01 manual rotation stage in order to vary the AOI on the filter. Irises were used to control the beam size through the filter, and a half-wave plate was only used to maximize throughput.

Measurements were made of both s- and p-polarization states at AOI steps of 5­° between 0° and 45°. All filters were tested except the NF405-13 filter, since a light source with a great enough power output at this wavelength was not available. The OSA software calculates the center wavelength from recorded spectra; these values were used to calculate the effective index n* using Equation 1.

The measured center wavelengths at each AOI are shown by clicking on the icons in the "OSA Measurements" column of the table below. Figures 2 and 3 show a summary of the results. In the graphs in the table, we also plot the theoretical curve based on the effective index for each filter; the value of n* used is the average of the values calculated at each AOI. The good agreement between the theoretical curve and the measured data points shows that the model can be used to determine the angle needed to achieve a particular center wavelength.

[1] Macleod, H.A, Thin-Film Optical Filters, 4th ed. Boca Raton: CRC Press, 2010.

[2] Pidgeon, C.R. and S.D. Smith, J. Opt. Soc. Am. 54, 1459 (1964).

S-Polarization Off-Axis Notch Filters
Click to Enlarge

Figure 2: Plot showing the change in center wavelength from the on-axis value for various angles of incidence for S-Polarized light. These measurements were made using the setup shown in Figure 1.
S-Polarization Off-Axis Notch Filters
Click to Enlarge

Figure 3: Plot showing the change in center wavelength from the on-axis value for various angles of incidence for P-Polarized light. These measurements were made using the setup shown in Figure 1.

Visualizing Spectral Performance: Spectrophotometer Measurements

Measurements were also taken using the spectrophotometer used to make the on-axis measurements shown on the Transmission Graphs tab. Transmission vs. wavelength plots for our notch filers, obtained at an AOI of 0°, 15°, 30°, and 45° for both s- and p-polarization states, can be found by clicking on the icons in the "Spectrophotometer Measurements" column of the table below. These measurements also show that the OD in the blocking region is decreased and the bandwidth is increased at higher AOI.

Plots of % transmission vs. wavelength and optical density in the blocking region may be found on the Transmission Graphs and OD Graphs tabs, respectively. 

Please note: All measured data presented is an example of the performance of our notch filters. Performance will vary from filter to filter, especially at these off-axis angles of incidence that are not controlled during manufacturing.

Item # OSA Measurements
With Theoretical Curve
Spectrophotometer Measurements Calculated Effective Index (n*)a
S-Polarization P-Polarization
NF405-13b - NF405-13
Raw Data
- -
NF488-15 NF488-15
Raw Data
2.08 1.83
NF514-17 NF514-17
Raw Data
2.01 1.80
NF533-17 NF533-17
Raw Data
1.91 1.74
NF561-18 NF561-18
Raw Data
1.96 1.76
NF594-23 NF594-23
Raw Data
1.93 1.73
NF633-25 NF633-25
Raw Data
1.98 1.76
NF658-26 NF658-26
Raw Data
1.91 1.70
NF785-33 NF785-33
Raw Data
1.92 1.73
NF808-34 NF808-34
Raw Data
1.88 1.69
NF980-41 NF980-41
Raw Data
1.88 1.70
NF1064-44 NF1064-44
Raw Data
1.94 1.74
  • The effective index, n*, given is the average value calculated from all OSA center wavelength measurements.
  • No OSA measurements were performed with the NF405-13 because a light source with a large enough power output at that wavelength was unavailable.

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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:besembeson
Posted Date:2014-11-05 03:29:58.0
Response from Bweh at Thorlabs USA: Yes we can provide this as a custom item for now. I will followup with you by email.
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: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: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.

Ø25 mm Notch Filters

Item # Center
Wavelength
FWHMof Blocking
Region (Max)
Passbands
(Tavg > 90%)
Diameter Thickness Substrate Transmission
Graphb
OD
Graphc
AOI
Graphsd
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 NF405-13 AOI 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 NF514-17 AOI 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 NF533-17 AOI 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 NF561-18 AOI 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 NF594-23 AOI 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 NF658-26 AOI 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 NF808-34 AOI 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 NF980-41 AOI 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
  • Please See the AOI Graphs Tab above for Raw Transmission vs. AOI Data
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
NF405-13 Support Documentation
NF405-13Customer Inspired!Ø25 mm Notch Filter, CWL = 405 nm, FWHM = 13 nm
$500.00
Today
NF514-17 Support Documentation
NF514-17Ø25 mm Notch Filter, CWL = 514 nm, FWHM = 17 nm
$500.00
Today
NF533-17 Support Documentation
NF533-17Ø25 mm Notch Filter, CWL = 533 nm, FWHM = 17 nm
$500.00
Today
NF561-18 Support Documentation
NF561-18Ø25 mm Notch Filter, CWL = 561 nm, FWHM = 18 nm
$500.00
Today
NF594-23 Support Documentation
NF594-23Ø25 mm Notch Filter, CWL = 594 nm, FWHM = 23 nm
$500.00
Today
NF658-26 Support Documentation
NF658-26Ø25 mm Notch Filter, CWL = 658 nm, FWHM = 26 nm
$500.00
Today
NF808-34 Support Documentation
NF808-34Customer Inspired!Ø25 mm Notch Filter, CWL = 808 nm, FWHM = 34 nm
$500.00
Today
NF980-41 Support Documentation
NF980-41Ø25 mm Notch Filter, CWL = 980 nm, FWHM = 41 nm
$500.00
Today

Ø1" Notch Filters

Item # Center
Wavelength
FWHMof Blocking
Region (Max)
Passbands
(Tavg > 90%)
Diameter Thickness Substrate Transmission
Graphb
OD
Graphc
AOI
Graphsd
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 NF488-15 AOI 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 NF633-25 AOI 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 NF785-33 AOI 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 NF1064-44 AOI 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
  • Please See the AOI Graphs Tab above for Raw Transmission vs. AOI Data
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
NF488-15 Support Documentation
NF488-15Ø1" Notch Filter, CWL = 488 nm, FWHM = 15 nm
$500.00
Today
NF633-25 Support Documentation
NF633-25Ø1" Notch Filter, CWL = 633 nm, FWHM = 25 nm
$500.00
Lead Time
NF785-33 Support Documentation
NF785-33Ø1" Notch Filter, CWL = 785 nm, FWHM = 33 nm
$500.00
3-5 Days
NF1064-44 Support Documentation
NF1064-44Ø1" Notch Filter, CWL = 1064 nm, FWHM = 44 nm
$500.00
Lead Time
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