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Unmounted UV Fused Silica Reflective ND Filters


  • UV to IR Spectral Range (200 - 1200 nm)
  • Metallic Nickel Coating on UV Fused Silica Substrate
  • Optical Densities from 0.1 to 4.0 Available

NDUV240B

50 mm x 50 mm

NDUV20B

Ø25 mm

NDUV503B

Ø1/2"

NDUV06B

Ø25 mm

NDUV505B

in a LMR05
Lens Mount
(Sold Separately)

Related Items


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IR Neutral Density Filters
Click to Enlarge

Transmission and Optical Density of Reflective UVFS ND Filters
Optic Cleaning Tutorial
Selection Guide for Neutral Density Filters
Absorptive Reflective
Uncoated
(400 - 650 nm)
Mounted N-BK7
(350 - 1100 nm)
Mounted
Unmounted Unmounted
Uncoated
(800 - 2600 nm)
Mounted UV Fused Silica
(200 - 1200 nm)
Mounted
Unmounted Unmounted
AR Coated
(350 - 700 nm)
Mounted ZnSe
(2 - 16 µm)
Mounted
Unmounted Unmounted
AR Coated
(650 - 1050 nm)
Mounted Wedged Reflective
Unmounted Variable Reflective
AR Coated
(1050 - 1620 nm)
Mounted Neutral Density Filter Kits
Unmounted

Features

  • Optimized for Light Attenuation in the UV
  • Available in Ø1/2", Ø25 mm, and 50 mm x 50 mm Sizes
  • Optical Densities Available from 0.1 - 4.0
  • Spectral Range: 200 - 1200 nm
  • Edge Blackening Available Upon Request

Thorlabs offers reflective neutral density (ND) filters made from UV fused silica substrates with nickel coatings deposited on one side, which provides a flat spectral response. These unmounted, metallic filters are usable in the 200 - 1200 nm spectral range and are available in Ø1/2", Ø25 mm, and 50 mm x 50 mm square versions. Each filter sold here includes a small, flat ground edge to visually distinguish it from our unmounted N-BK7 reflective ND filters. For other mounting options and wavelength ranges, please see the Selection Guide table on the bottom right.

The UV fused silica substrate used in these filters exhibits high transmission and virtually no laser-induced fluorescence, as measured at 193 nm, making it an ideal choice for applications from the UV to the near IR. While the spectral range's lower limit of 200 nm is limited by the absorption of the light by the substrate, UV fused silica provides good transmission up to 2.1 µm, and thus the upper limit of 1200 nm is dependent on the increased opacity of the nickel coating. The optical density (OD) for each filter is specified at the design wavelength of 300 nm to facilitate their use in the UV; some variation in the OD will occur over the usable range. For plots showing the typical performance of the filters from 200 to 2600 nm, click on info in the row corresponding to the desired filter in the tables below.

Unprotected metal coatings like this should only be cleaned by blown air, never touched, as contact may cause scratching to the unprotected surface. Although these are reflective ND filters, the nickel coating does absorb some of the incident light, which limits the use of these filters to low-power applications. Nickel is resistant to aging under normal conditions; however, it will oxidize at elevated temperatures. To prevent oxidation, Thorlabs recommends using these ND filters at temperatures below 100°C. To achieve the best performance light should be incident on the side with the nickel coating.

The optical density, OD, is defined in terms of transmission T by the following equation:

Optical Density Equation

Choosing an ND filter with a higher optical density will translate to lower transmission and greater reflection of the incident light. For higher transmission and less reflection, a lower optical density would be appropriate.

Filter Dimensions Ø1/2" Ø25 mm 50 mm x 50 mm
Substrate Material UV Fused Silicaa
Front Surface Coating Nickel
Spectral Range 200 - 1200 nm
Optical Density Toleranceb ±5%
Optic Dimension Tolerance +0.00 / -0.25 mm +0.00 / -0.20 mm
Clear Aperture 90% of Outer Diameter >45.0 mm x 45.0 mm
Filter Thickness 1 mm  2 mm
Thickness Tolerance ±0.25 mm ±0.10 mm
Surface Flatness @ 633 nm <2λ  <5λ per Ø25 mm <2λ per 25 mm
Parallelism <3 arcmin <30 arcsec
Surface Quality 40-20 Scratch-Dig
Operating Temperaturec <100 °C
  • Click Link for Detailed Specifications on the Substrate
  • The optical density tolerance is specified at 300 nm.
  • The nickel coating will oxidize at temperatures greater than 100 °C.

Optical Density Damage Threshold
0.3 0.025 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)
1.0 0.05 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)
2.0 0.075 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)
Damage Threshold Specifications
Optical Density Damage Threshold
0.3 0.025 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)
1.0 0.05 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)
2.0 0.075 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.772 mm)

Damage Threshold Data for Thorlabs' UV Reflective ND Filters

The specifications to the right are measured data for Thorlabs' UV reflective neutral density filters. Damage threshold specifications are constant for a given optical density, regardless of the size of the filter.

 

Laser Induced Damage Threshold Tutorial

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 and ISO 21254 specifications.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence # of Tested Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm):

CW Wavelength Scaling

While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1998).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. To use the calculator, enter the specified LIDT value of the optic under consideration and the relevant parameters of your laser system in the green boxes. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. These values are used to calculate adjusted, scaled LIDT values for the optics based on accepted scaling laws. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed. Remember that absorption by optics or coatings can significantly reduce LIDT in some spectral regions. These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration.

Intensity Distribution
A Gaussian beam profile has about twice the maximum intensity of a uniform beam profile.

CW Laser Example
Suppose that a CW laser system at 1319 nm produces a 0.5 W Gaussian beam that has a 1/e2 diameter of 10 mm. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter:

CW Wavelength Scaling

However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm.

An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. CW damage threshold values typically scale directly with the wavelength of the laser source, so this yields an adjusted LIDT value:

CW Wavelength Scaling

The adjusted LIDT value of 350 W/cm x (1319 nm / 1550 nm) = 298 W/cm is significantly higher than the calculated maximum linear power density of the laser system, so it would be safe to use this doublet lens for this application.

Pulsed Nanosecond Laser Example: Scaling for Different Pulse Durations
Suppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). The average energy density of each pulse is found by dividing the pulse energy by the beam area:

Pulse Energy Density

As described above, the maximum energy density of a Gaussian beam is about twice the average energy density. So, the maximum energy density of this beam is ~0.7 J/cm2.

The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Therefore, an adjustment must be applied for the shorter pulse duration of the system under consideration. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration:

Pulse Length Scaling

This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system.

Pulsed Nanosecond Laser Example: Scaling for Different Wavelengths
Suppose that a pulsed laser system emits 10 ns pulses at 2.5 Hz, each with 100 mJ of energy at 1064 nm in a 16 mm diameter beam (1/e2) that must be attenuated with a neutral density filter. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime:

Pulse Wavelength Scaling

This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. In this case, the absorptive filter is the best choice in order to avoid optical damage.

Pulsed Microsecond Laser Example
Consider a laser system that produces 1 µs pulses, each containing 150 µJ of energy at a repetition rate of 50 kHz, resulting in a relatively high duty cycle of 5%. This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. As a result, both CW and pulsed LIDT values must be compared to the properties of the laser system to ensure safe operation.

If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm. As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. The pulsed LIDT of the optic is significantly greater than the energy density of the laser pulse, so individual pulses will not damage the wave plate. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam.


Posted Comments:
mjroux  (posted 2015-04-23 04:55:58.53)
Is it possible to obtain filters form this line (UV Fused Silica) in a larger diameter (50 mm)? If so could you send me a quotation for a set of three filters of ND 0.5, 1 and 2 ? Best regards, Michel Roux
jlow  (posted 2015-04-28 03:28:26.0)
Response from Jeremy at Thorlabs: We can offer this. We will contact you directly for a quote.

Ø1/2" UV Fused Silica Metallic ND Filters, Unmounted

Item # Optical Densitya
(Transmission)
Transmission Data
NDUV510B 1.0 (10%) info
NDUV513B 1.3 (5%) info
NDUV520B 2.0 (1%) info
NDUV530B 3.0 (0.1%) info
NDUV540B 4.0 (0.01%) info
  • The optical density for each filter is specified at the design wavelength of 300 nm. Some variation will occur over the usable range. Click on More Info Icon for a plot and downloadable data.
Item # Optical Densitya
(Transmission)
Transmission Data
NDUV501B 0.1 (79%) info
NDUV502B 0.2 (63%) info
NDUV503B 0.3 (50%) info
NDUV504B 0.4 (40%) info
NDUV505B 0.5 (32%) info
NDUV506B 0.6 (25%) info
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDUV501B Support Documentation
NDUV501BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.1
$35.70
Today
NDUV502B Support Documentation
NDUV502BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.2
$35.70
Today
NDUV503B Support Documentation
NDUV503BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.3
$35.70
Today
NDUV504B Support Documentation
NDUV504BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.4
$35.70
Today
NDUV505B Support Documentation
NDUV505BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.5
$35.70
Today
NDUV506B Support Documentation
NDUV506BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 0.6
$35.70
Today
NDUV510B Support Documentation
NDUV510BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 1.0
$35.70
Today
NDUV513B Support Documentation
NDUV513BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 1.3
$35.70
Today
NDUV520B Support Documentation
NDUV520BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 2.0
$45.39
Today
NDUV530B Support Documentation
NDUV530BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 3.0
$45.39
Today
NDUV540B Support Documentation
NDUV540BUnmounted Ø1/2" UVFS Reflective ND Filter, OD: 4.0
$45.39
Today

Ø25 mm UV Fused Silica Metallic ND Filters, Unmounted

Item # Optical Densitya
(Transmission)
Transmission Data
NDUV10B 1.0 (10%) info
NDUV13B 1.3 (5%) info
NDUV20B 2.0 (1%) info
NDUV30B 3.0 (0.1%) info
NDUV40B 4.0 (0.01%) info
  • The optical density for each filter is specified at the design wavelength of 300 nm. Some variation will occur over the usable range. Click on More Info Icon for a plot and downloadable data.
Item # Optical Densitya
(Transmission)
Transmission Data
NDUV01B 0.1 (79%) info
NDUV02B 0.2 (63%) info
NDUV03B 0.3 (50%) info
NDUV04B 0.4 (40%) info
NDUV05B 0.5 (32%) info
NDUV06B 0.6 (25%) info
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDUV01B Support Documentation
NDUV01BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.1
$49.22
Today
NDUV02B Support Documentation
NDUV02BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.2
$49.22
Today
NDUV03B Support Documentation
NDUV03BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.3
$49.22
5-8 Days
NDUV04B Support Documentation
NDUV04BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.4
$49.22
Today
NDUV05B Support Documentation
NDUV05BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.5
$49.22
Today
NDUV06B Support Documentation
NDUV06BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 0.6
$49.22
Today
NDUV10B Support Documentation
NDUV10BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 1.0
$49.22
Today
NDUV13B Support Documentation
NDUV13BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 1.3
$54.83
Today
NDUV20B Support Documentation
NDUV20BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 2.0
$60.18
Today
NDUV30B Support Documentation
NDUV30BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 3.0
$60.18
Today
NDUV40B Support Documentation
NDUV40BUnmounted Ø25 mm UVFS Reflective ND Filter, OD: 4.0
$60.18
Today

50 mm Square UV Fused Silica Metallic ND Filters, Unmounted

Item # Optical Densitya
(Transmission)
Transmission Data
NDUV210B 1.0 (10%) info
NDUV213B 1.3 (5%) info
NDUV220B 2.0 (1%) info
NDUV230B 3.0 (0.1%) info
NDUV240B 4.0 (0.01%) info
  • The optical density for each filter is specified at the design wavelength of 300 nm. Some variation will occur over the usable range. Click on More Info Icon for a plot and downloadable data.
Item # Optical Densitya
(Transmission)
Transmission Data
NDUV201B 0.1 (79%) info
NDUV202B 0.2 (63%) info
NDUV203B 0.3 (50%) info
NDUV204B 0.4 (40%) info
NDUV205B 0.5 (32%) info
NDUV206B 0.6 (25%) info
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDUV201B Support Documentation
NDUV201BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.1
$68.91
Today
NDUV202B Support Documentation
NDUV202BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.2
$68.91
Lead Time
NDUV203B Support Documentation
NDUV203BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.3
$68.91
5-8 Days
NDUV204B Support Documentation
NDUV204BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.4
$68.91
Today
NDUV205B Support Documentation
NDUV205BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.5
$68.91
Today
NDUV206B Support Documentation
NDUV206BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 0.6
$68.91
Today
NDUV210B Support Documentation
NDUV210BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 1.0
$68.91
5-8 Days
NDUV213B Support Documentation
NDUV213BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 1.3
$76.76
Today
NDUV220B Support Documentation
NDUV220BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 2.0
$84.26
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NDUV230B Support Documentation
NDUV230BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 3.0
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NDUV240B Support Documentation
NDUV240BNEW!Customer Inspired! Unmounted 50 mm x 50 mm UVFS Reflective ND Filter, OD: 4.0
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