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N-BK7 High Precision Windows


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N-BK7 High Precision Windows

Precision Window Selection Guide
Wavelength RangeSubstrate Material
120 nm - 6 μmMagnesium Fluoride (MgF2)
150 nm - 5 μmSapphire
180 nm - 8 μmCalcium Fluoride (CaF2)
185 nm - 2.1 μmUV Fused Silica
200 nm - 11 μmBarium Fluoride (BaF2)
300 nm - 3 µmInfrasil®
350 nm - 2.0 μmN-BK7
600 nm - 16 µmZinc Selenide (ZnSe)
1.2 - 8 μmSilicon (Si)
2 - 16 μmGermanium (Ge)

Features

  • Three Sizes Available
    • Ø1/2": 3.0 mm Thick
    • Ø1": 1.0 mm or 5.0 mm Thick
    • Ø2": 12.0 mm Thick
  • Available Uncoated or with One of Three Broadband AR Coatings
    • 350 - 700 nm (-A Coating Designation)
    • 650 - 1050 nm (-B Coating Designation)
    • 1050 - 1700 nm (-C Coating Designation)
  • N-BK7 Substrate

Thorlabs' Ø1/2", Ø1", and Ø2" N-BK7 High Precision Windows are available uncoated for the 350 nm - 2.0 μm range or with one of our three low-loss standard broadband antireflection (AR) coatings deposited on both surfaces: -A (350 - 700 nm), -B (650 - 1050 nm), or -C (1050 - 1700 nm). While uncoated windows have typical losses of about 4% per surface, the AR coatings reduce this to Ravg < 0.5%. These AR coatings provide good performance for angles of incidence (AOI) between 0° and 30°. For additional information on these coatings, please see the Graphs tab.

The Ø1" windows are available with a 1.0 mm or 5.0 mm thick substrate. The 1.0 mm thick windows are ideal for ultrafast applications or in situations where space is limited. We recommend mounting the thin windows in our LMR1 Fixed Lens Mount and securing them with a SM1LTRR Stress-Free Retaining Ring.

N-BK7 provides excellent transmission in the visible and near infrared portions of the spectrum. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.

Thorlabs offers High Precision Windows fabricated from various substrate materials for use in a large variety of laser and industrial applications. We also offer laser windows and wedged laser windows, which have wavelength-specific AR coatings centered around commonly used laser wavelengths, and Brewster windows, which are used to eliminate p-polarization reflectance.

Common Specifications
Diameter Tolerance+0.0 / -0.2 mm
Surface Quality20-10 Scratch-Dig
Coating PerformanceaRavg < 0.5%
Clear Aperture>90% Diameter
SubstrateN-BK7b
  • Average Reflectance across the specified wavelength ranges for an angle of incidence of 0° ± 5°.
  • Click Link for Detailed Specifications on the Substrate
N-BK7 Transmission
Click to Enlarge

Click Here for Raw Data
Optic Cleaning Tutorial  Optical Coatings Guide

All of these N-BK7 high precision windows can be ordered uncoated or with one of the following broadband AR coatings: 350 - 700 nm (designated as -A), 650 - 1050 nm (designated as -B), or 1050 - 1700 nm (designated as -C).

These high-performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges. The central valley shown in each curve corresponds to a percent reflectance that is less than 0.25%. These AR coatings provide good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). The plots shown below indicate the performance of the standard coatings in this family as a function of wavelength. Broadband coatings have a typical absorption of 0.25%, which is not shown in the reflectance plots.

For optics intended to be used at larger incident angles, consider ordering a custom coating optimized for a 45° angle of incidence; this custom coating is recommended for use with incidence angles from 25° to 52°. Please contact Tech Support to request a quote for this and other custom requests.

B AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance.
A AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
C AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 1050 - 1700 nm wavelength range for optimum performance.
N-BK7 Window Transmission
Click to Enlarge

Click Here for Raw Data

Thorlabs' Standard Broadband Antireflection Coatings

Damage Threshold Specifications
Coating Designation
(Item # Suffix)
Damage Threshold
-A7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.504 mm
-B7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.144 mm
-C7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.123 mm

Damage Threshold Data for Thorlabs' AR-Coated N-BK7 Windows

The specifications to the right are measured data for Thorlabs' N-BK7 high precision windows. Damage threshold specifications are constant for a given coating type, regardless of the size of the window.

 

Laser Induced Damage Threshold Tutorial

This 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 specifications. A standard 1-on-1 testing regime is performed to test the damage threshold.

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 a set duration of time (CW) or number of pulses (prf 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 LocationsLocations with DamageLocations Without Damage
1.50 J/cm210010
1.75 J/cm210010
2.00 J/cm210010
2.25 J/cm21019
3.00 J/cm21019
5.00 J/cm21091

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 it is only representative of one coating run and that Thorlabs' specified damage thresholds 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. Additionally, when pulse lengths are between 1 ns and 1 µs, LIDT can occur either because of absorption or a dielectric breakdown (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 large 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. Linear power density of your beam (total power divided by 1/e2 spot size)
  3. Beam diameter of your beam (1/e2)
  4. Approximate intensity profile of your beam (e.g., Gaussian)

The power density of your beam should be calculated in terms of W/cm. The graph to the right shows why the linear power density provides the best metric for long pulse and CW sources. Under these conditions, linear power density scales independently of spot size; 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 consider hotspots in the beam or other nonuniform 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). 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 pulse lengths that our specified LIDT values are relevant for.

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 Durationt < 10-9 s10-9 < t < 10-7 s10-7 < t < 10-4 st > 10-4 s
Damage MechanismAvalanche IonizationDielectric BreakdownDielectric Breakdown or ThermalThermal
Relevant Damage SpecificationN/APulsedPulsed and CWCW

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 the energy density provides the best metric for short pulse sources. Under these conditions, energy density scales independently of spot size, 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 power 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 (1997).
[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).

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Posted Comments:
Poster: besembeson
Posted Date: 2014-10-09 12:41:51.0
Response from Bweh at Thorlabs: I will send you an email that shows the reflectivity of the -B coating up to 1400nm. This can also be found at the following link, under "AR Coating": https://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=5840. I will follow up by email about your application and if a custom coating (which we can do) will be needed.
Poster: jens.kiessling
Posted Date: 2014-09-30 17:51:37.137
Dear Thorlabs Team, I need 1" windows AR-coated for 900-1300 nm. Can you send me the transission data for the B coating up to 1300 nm? Is a custom coating possible? thanks in advance Jens
Poster: jlow
Posted Date: 2014-09-25 09:32:48.0
Response from Jeremy at Thorlabs: We have fixed mount, kinematic mounts, lens tubes, translation mount, etc. that can be used with this. Since you did not provide an e-mail address, can you contact us at techsupport@thorlabs.com please? We can suggest the appropriate mount for your application.
Poster:
Posted Date: 2014-09-23 08:20:38.853
Which component can be used to mount WG12012, cause it is 12mm thick?
Poster: besembeson
Posted Date: 2014-05-29 01:54:15.0
A response from Bweh E at Thorlabs Newton-USA: Thanks for contacting Thorlabs. We are actually working on releasing these 1mm windows, with and without AR coating. I will contact you via email to know which ones you are be interested in, and what quantity.
Poster: m.schnell
Posted Date: 2014-05-23 16:04:58.233
Hi, do you have 1-inch windows with a thickness of only 1 mm or 3mm, similar to, for example, the economy beam splitter EBS1? Thanks!
Poster: acb20
Posted Date: 2014-04-17 16:21:52.123
Is it possible to get the -C15 coating on these windows? That is the coating with low reflectivity at both ~532 nm and ~1064nm offered on your wedged beamsplitters.
Poster: jlow
Posted Date: 2014-04-17 04:33:36.0
Response from Jeremy at Thorlabs: Yes we can do this. I will contact you on getting this quoted.
Poster: simonk
Posted Date: 2014-02-18 11:31:40.387
What is the maximum (continuous) temperature which the AR coatings are able to withstand? What is the maximum temperature gradient that can be applied (continuously) between the two faces of the 1/2" 3mm BK7 and fused silica windows?
Poster: jlow
Posted Date: 2014-02-27 05:18:56.0
Response from Jeremy at Thorlabs: The maximum temperature will be around 200°C or so. We do not spec a maximum temperature gradient since it can depend on the thermal boundary conditions and geometrical boundary conditions of the window. However, I would recommend UVFS over N-BK7 because of its much lower coefficient of thermal coefficient.
Poster: edulgergil
Posted Date: 2013-02-27 03:18:52.237
We want to use WG11050-B in EMI susceptible system, is there any information related to wide rf spectral response of this product?
Poster: tcohen
Posted Date: 2013-03-06 14:44:00.0
Response from Tim at Thorlabs: Thank you for your feedback. We have not explored testing this before, nor does there seem to be a wealth of information available on this. This will most likely need to be tested directly in your setup. I will contact you to discuss this further.
Poster:
Posted Date: 2010-06-07 15:09:23.0
Response from Javier at Thorlabs to jenna.holder: We can provide our windows in many custom sizes. I will contact you with more details.
Poster: jenna.holder
Posted Date: 2010-06-07 08:51:43.0
I require a window of 5cm diameter. Do you have any of this size?
Poster: jens
Posted Date: 2009-06-10 14:59:08.0
An answer from Jens at Thorlabs: the thickness of the windows used in this measurement was 5mm.
Poster: jeffrey.owen.white
Posted Date: 2009-06-10 09:28:17.0
Under the materials tab in the windows page, theres a graph of transmission for BK7 and fused silica. One needs to know the sample thickness in order to interpret those graphs.
Poster: Laurie
Posted Date: 2009-02-02 08:38:56.0
Response from Laurie at Thorlabs to Alexander.Radnaev: Thank you for taking some time to provide us with feedback as to how we can improve our web presentations. We have updated updated our transmission graphs to include a note that surface reflections are included in these plots. We apologize for any confusion this may have caused and hope that these new graphs are more clear.
Poster: Alexander.Radnaev
Posted Date: 2009-01-31 16:20:06.0
Hello, Id make a note on your BK7 transmission graph (http://63.161.211.69/BK7trans.jpg) "Surface reflections included" as it is in your catalog. Otherwise its confusing. Thanks,
Poster: Tyler
Posted Date: 2008-11-03 16:23:41.0
A response from Tyler at Thorlabs to dl1net: The focal point position will be retarded by the laser window. A member of our technical support department will contact you in the hopes of providing information specific to your application. Thank you for using our forum and if we can be of any further assistance please contact us again.
Poster: dl1net
Posted Date: 2008-10-31 14:54:27.0
Hello, a very fundamental question: I have a laser beam, which is focussed by a lens. Now, if i put a laser window in between the lens and the focus, how will the focus position and the focus beam waist change? Many thanks for a fast answer!! Johannes Hagen
Poster: TechnicalMarketing
Posted Date: 2008-06-03 15:20:25.0
Thank you for your interest in Thorlabs. We have updated our drawings to help clairfy that both sides of the lenses are coated. If you have any further questions please feel free to contact us directly.
Poster: ghegenbart
Posted Date: 2008-04-15 08:16:10.0
The AR coated versions are coated on both sides. However, in the pdf drawings there is a hint on the coating with an arrow pointing to only one surface of the item. This is misleading since it suggests that only one side is coated.
Poster: TechnicalMarketing
Posted Date: 2007-10-08 11:22:08.0
We added an AR Coatings tab so that you can see the theoretical performance of the AR coatings available from stock on our precision laser quality windows. Thank you for taking the time to inform us that this web page was missing the AR coating curves.
Poster: acable
Posted Date: 2007-10-05 20:17:59.0
AR coating curves are no where to be found, also table on Spec tab says "coating" without saying what kind of coating.
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Ø1/2" (12.7 mm) N-BK7 Broadband Windows, 3.0 mm Thick
Item # Diameter Thickness Parallelism Surface Flatnessa AR Coatingb Damage Threshold
WG10530 12.7 mm 3.0 ± 0.3 mm ≤5 arcsec λ/10 over CA Uncoated -
WG10530-A 12.7 mm 3.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 350 - 700 nm 7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.504 mm
WG10530-B 12.7 mm 3.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 650 - 1050 nm 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.144 mm
WG10530-C 12.7 mm 3.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 1050 - 1700 nm 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.123 mm
  • Measured at 633 nm
  • Average Reflectance of <0.5% across the specified wavelength ranges for an angle of incidence of 0° ± 5°
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
WG10530 Support Documentation
WG10530 Ø1/2" N-BK7 Broadband Precision Window, Uncoated
$50.90
Today
WG10530-A Support Documentation
WG10530-A Ø1/2" N-BK7 Broadband Precision Window, AR Coated: 350 - 700 nm
$80.40
Today
WG10530-B Support Documentation
WG10530-B Ø1/2" N-BK7 Broadband Precision Window, AR Coated: 650 - 1050 nm
$80.40
Today
WG10530-C Support Documentation
WG10530-C Ø1/2" N-BK7 Broadband Precision Window, AR Coated: 1050 - 1700 nm
$80.40
Today
Ø1" (25.4 mm) N-BK7 Broadband Windows, 1.0 mm Thick
Item # Diameter Thickness Parallelism TWEa AR Coatingb Damage Threshold
WG11010 25.4 mm 1.0 ± 0.1 mm <1 arcmin λ/4 @ 633 nm Uncoated -
WG11010-A 25.4 mm 1.0 ± 0.1 mm <1 arcmin λ/4 @ 633 nm 350 - 700 nm 7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.504 mm
WG11010-B 25.4 mm 1.0 ± 0.1 mm <1 arcmin λ/4 @ 633 nm 650 - 1050 nm 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.144 mm
WG11010-C 25.4 mm 1.0 ± 0.1 mm <1 arcmin λ/4 @ 633 nm 1050 - 1700 nm 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.123 mm
  • Transmitted Wavefront Error
  • Average Reflectance of <0.5% across the specified wavelength ranges for an angle of incidence of 0° ± 5°
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
WG11010 Support Documentation
WG11010 NEW! Customer Inspired! Ø1" N-BK7 Broadband Precision Window, Uncoated, 1 mm Thick
$74.10
Today
WG11010-A Support Documentation
WG11010-A NEW! Customer Inspired! Ø1" N-BK7 Broadband Precision Window, AR Coated: 350 - 700 nm, 1 mm Thick
$103.60
Today
WG11010-B Support Documentation
WG11010-B NEW! Customer Inspired! Ø1" N-BK7 Broadband Precision Window, AR Coated: 650 - 1050 nm, 1 mm Thick
$103.60
Lead Time
WG11010-C Support Documentation
WG11010-C NEW! Customer Inspired! Ø1" N-BK7 Broadband Precision Window, AR Coated: 1050 - 1700 nm, 1 mm Thick
$103.60
Today
Ø1" (25.4 mm) N-BK7 Broadband Windows, 5.0 mm Thick
Item # Diameter Thickness Parallelism Surface Flatnessa AR Coatingb Damage Threshold
WG11050 25.4 mm 5.0 ± 0.3 mm ≤5 arcsec λ/10 over CA Uncoated -
WG11050-A 25.4 mm 5.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 350 - 700 nm 7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.504 mm
WG11050-B 25.4 mm 5.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 650 - 1050 nm 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.144 mm
WG11050-C 25.4 mm 5.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 1050 - 1700 nm 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.123 mm
  • Measured at 633 nm
  • Average Reflectance of <0.5% across the specified wavelength ranges for an angle of incidence of 0° ± 5°
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
WG11050 Support Documentation
WG11050 Ø1" N-BK7 Broadband Precision Window, Uncoated
$74.10
Today
WG11050-A Support Documentation
WG11050-A Ø1" N-BK7 Broadband Precision Window, AR Coated: 350 - 700 nm
$103.60
Today
WG11050-B Support Documentation
WG11050-B Ø1" N-BK7 Broadband Precision Window, AR Coated: 650 - 1050 nm
$103.60
Today
WG11050-C Support Documentation
WG11050-C Ø1" N-BK7 Broadband Precision Window, AR Coated: 1050 - 1700 nm
$103.60
Today
Ø2" (50.8 mm) N-BK7 Broadband Windows, 12.0 mm Thick
Item # Diameter Thickness Parallelism Surface Flatnessa AR Coatingb Damage Threshold
WG12012 50.8 mm 12.0 ± 0.3 mm ≤5 arcsec λ/10 over CA Uncoated -
WG12012-A 50.8 mm 12.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 350 - 700 nm 7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.504 mm
WG12012-B 50.8 mm 12.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 650 - 1050 nm 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.144 mm
WG12012-C 50.8 mm 12.0 ± 0.3 mm ≤5 arcsec λ/10 over CA 1050 - 1700 nm 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.123 mm
  • Measured at 633 nm
  • Average Reflectance of <0.5% across the specified wavelength ranges for an angle of incidence of 0° ± 5°
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
WG12012 Support Documentation
WG12012 Ø2" N-BK7 Broadband Precision Window, Uncoated
$120.50
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WG12012-A Support Documentation
WG12012-A Ø2" N-BK7 Broadband Precision Window, AR Coated: 350 - 700 nm
$150.50
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WG12012-B Support Documentation
WG12012-B Ø2" N-BK7 Broadband Precision Window, AR Coated: 650 - 1050 nm
$150.50
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WG12012-C Support Documentation
WG12012-C Ø2" N-BK7 Broadband Precision Window, AR Coated: 1050 - 1700 nm
$150.50
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