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ND Filters: Unmounted, AR Coated for 650 - 1050 nm


  • Ø1/2" and Ø25 mm Versions Available
  • AR Coated for 650 to 1050 nm
  • Optical Densities at 633 nm Prior to Coating: 0.1 to 6.0
  • Ideal for Low-Power Applications (<1 W)

NE20B-B

(Ø25 mm)

NE550B-B

(Ø1/2")

Application Idea

NE505B-B Mounted in LMR05

Related Items


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Neutral Density Filter
Selection Guide
Absorptive
Uncoated
(400 - 650 nm)		 Mounted
Unmounted
Uncoated
(1000 - 2600 nm)		 Mounted
Unmounted
AR Coated
(350 - 700 nm)		 Mounted
Unmounted
AR Coated
(650 - 1050 nm)		 Mounted
Unmounted
AR Coated
(1050 - 1700 nm)		 Mounted
Unmounted
Variable
Reflective
UV Fused Silica
(200 - 1200 nm)		 Mounted
Unmounted
N-BK7
(350 - 1100 nm)		 Mounted
Unmounted
ZnSe
(2 - 16 µm)		 Mounted
Unmounted
Wedged UVFS (200 - 1200 nm)
Wedged N-BK7 (350 - 1100 nm)
Variable
Neutral Density Filter Kits

Optic Cleaning Tutorial
ND Filter Manufacturing
Click to Enlarge
One of Our Grinding Machines That is Used to Manufacture ND Filters

Features

  • Attenuate Light in the Near IR (650 - 1050 nm AR Coating)
  • Optical Densities at 633 nm Prior to Coating: 0.1 to 6.0
  • Unmounted Ø1/2" and Ø25 mm Versions
  • AR Coated to Reduce Back Reflections in an Optical System
  • Ideal for Low-Power Applications (<1 Watt)

Thorlabs is pleased to offer its most popular unmounted absorptive neutral density filters with a broadband antireflection coating for the 650 - 1050 nm range deposited on both surfaces. These filters are also available in mounted versions or with a broadband AR coating for the 350 - 700 nm range. Please see the Selection Guide table to the right for more information.

The high-performance, multilayer broadband B coating deposited on each filter is designed to minimize surface reflections within the 650 - 1050 nm range, thereby reducing the amount of stray light present. These coatings provide an average reflectance that is less than 0.5% per surface over the specified wavelength range when light is normally incident on the filter surface. Typical transmission data is available by clicking on the blue info icons () in the tables below.

Unlike metallic neutral density filters, each absorptive ND filter is fabricated from one member of a family of Schott glasses (see the Specs tab for more information). Each Schott glass has a spectrally flat absorption coefficient. By varying the type of glass used and the thickness of that glass, we are able to produce our entire line of absorptive ND filters from just four types of Schott glass. See below for detailed information about the average transmission obtained with each of our AR-coated absorptive neutral density filters.

Optical Density and Transmission

Optical density (OD) indicates the attenuation factor provided by an optical filter, i.e. how much it reduces the optical power of an incident beam. OD is related to the transmission, T, by the equation

Optical Density Equation

where T is a value between 0 and 1. Choosing an ND filter with a higher optical density will translate to lower transmission and greater absorption of the incident light. For higher transmission and less absorption, a lower optical density would be appropriate. As an example, if a filter with an OD of 2 results in a transmission value of 0.01, this means the filter attenuates the beam to 1% of the incident power. Please note that the transmission data for our neutral density filters is provided in percent (%).

Please note that these products are not designed for use as laser safety equipment. For lab safety, Thorlabs offers an extensive line of safety and blackout products, including beam blocks, that significantly reduce exposure to stray light.

Transmission and Optical Density of -B Coated ND Filters. The values in the legend are the typical optical densities at 633 nm for each optic prior to coating. The blue shaded region indicates the wavelength range for which the AR coating performance is specified.
Optical
Density
(OD)a		 OD
Tolerancea		 Substrate Substrate
Thicknessb		 Ø1/2"
Item #		 Ø25 mm
Item #
0.1 ± 0.005 NG11 0.6 mm NE501B-B NE01B-B
0.2 ± 0.01 NG11 1.4 mm NE502B-B NE02B-B
0.3  ± 0.015 NG11 2.3 mm NE503B-B NE03B-B
0.4  ± 0.02 NG4 0.7 mm NE504B-B NE04B-B
0.5 ± 0.025 NG4 0.9 mm NE505B-B NE05B-B
0.6  ± 0.03 NG4 1.1 mm NE506B-B NE06B-B
0.7  ± 0.04 NG4 1.3 mm NE507B-B NE07B-B
0.8  ± 0.05 NG4 1.5 mm NE508B-B NE08B-B
0.9  ± 0.05 NG4 1.7 mm NE509B-B NE09B-B
1.0  ± 0.05 NG4 1.9 mm NE510B-B NE10B-B
1.3  ± 0.065 NG4 2.5 mm NE513B-B NE13B-B
1.5  ± 0.08 NG4 2.9 mm NE515B-B NE15B-B
2.0  ± 0.1 NG9 1.4 mm NE520B-B NE20B-B
3.0  ± 0.15 NG9 2.1 mm NE530B-B NE30B-B
4.0  ± 0.2 NG9 2.8 mm NE540B-B NE40B-B
5.0  ± 0.25 NG9 3.6 mm NE550B-B NE50B-B
6.0  ± 0.3 NG1 1.5 mm NE560B-B NE60B-B
  • Measured at 633 nm before the AR coating is applied. See the tables below for a plot of typical transmission for each filter.
  • Values given are typical. The actual thickness of each ND filter is dependent on the optical density of the lot of glass used to manufacture each lot of ND filters.
General Specifications
Diameter 12.7 mm 25.0 mm
Diameter Tolerance +0.00 / -0.25 mm
Clear Aperture >90% Outer Diameter
AR Coating Range 650 - 1050 nm
Reflectance (Average) <0.5% per Surfacea
Surface Flatnessb <λ/4 (OD = 0.7, 0.8, 0.9, or 1.5)
λ/4 (All Other ODs)
Surface Quality 40-20 Scratch-Dig
Parallelism <3 arcmin (OD = 0.7, 0.8, 0.9, or 1.5)
3 arcmin (All Other ODs)		 <10 arcsec (OD = 0.7, 0.8, 0.9, or 1.5)
10 arcsec (All Other ODs)
  • At 0° AOI
  • At 633 nm
B AR Coating
Click to Enlarge
Click Here for Raw Data
The blue shaded region indicates the 650 - 1050 nm wavelength range over which the AR coating provides <0.5% average reflectance per surface.

Posted Comments:
jochen.philippi  (posted 2014-09-24 16:05:02.983)
Where can i find the refraction index of NE60B-B near 1000um wavelength ? Thanks ! Jochen
jlow  (posted 2014-09-25 09:09:50.0)
Response from Jeremy at Thorlabs: The glass used in the filter is NG1 from Schott. I will contact you directly for this info.

Ø1/2" Unmounted Absorptive ND Filters, AR-Coated: 650 - 1050 nm

Item # Transmission Dataa OD at 633 nmb Thicknessc
NE510B-B info 1.0 ± 0.05 1.9 mm
NE513B-B info 1.3 ± 0.065 2.5 mm
NE515B-B info 1.5 ± 0.08 2.9 mm
NE520B-B info 2.0 ± 0.1 1.4 mm
NE530B-B info 3.0 ± 0.15 2.1 mm
NE540B-B info 4.0 ± 0.2 2.8 mm
NE550B-B info 5.0 ± 0.25 3.6 mm
NE560B-B info 6.0 ± 0.3 1.5 mm
Item # Transmission Dataa OD at 633 nmb Thicknessc
NE501B-B info 0.1 ± 0.005 0.6 mm
NE502B-B info 0.2 ± 0.01 1.4 mm
NE503B-B info 0.3 ± 0.015 2.3 mm
NE504B-B info 0.4 ± 0.02 0.7 mm
NE505B-B info 0.5 ± 0.025 0.9 mm
NE506B-B info 0.6 ± 0.03 1.1 mm
NE507B-B info 0.7 ± 0.04 1.3 mm
NE508B-B info 0.8 ± 0.05 1.5 mm
NE509B-B info 0.9 ± 0.05 1.7 mm
  • Click the icon to view a plot of the typical filter transmission.
  • Measured before the AR coating is applied. See Transmission Data graphs for typical performance.
  • Values given are typical. The actual thickness of each ND filter is dependent on the optical density of the lot of glass used to manufacture each lot of ND filters.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NE501B-B Support Documentation
NE501B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.1
$39.23
Today
NE502B-B Support Documentation
NE502B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.2
$39.23
Today
NE503B-B Support Documentation
NE503B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.3
$39.23
5-8 Days
NE504B-B Support Documentation
NE504B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.4
$39.23
Today
NE505B-B Support Documentation
NE505B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.5
$39.23
5-8 Days
NE506B-B Support Documentation
NE506B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.6
$39.23
5-8 Days
NE507B-B Support Documentation
NE507B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.7
$39.23
Today
NE508B-B Support Documentation
NE508B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.8
$39.23
Today
NE509B-B Support Documentation
NE509B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.9
$39.23
Today
NE510B-B Support Documentation
NE510B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.0
$39.23
Today
NE513B-B Support Documentation
NE513B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.3
$39.23
5-8 Days
NE515B-B Support Documentation
NE515B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.5
$39.23
Today
NE520B-B Support Documentation
NE520B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 2.0
$39.23
5-8 Days
NE530B-B Support Documentation
NE530B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 3.0
$39.23
Today
NE540B-B Support Documentation
NE540B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 4.0
$39.23
5-8 Days
NE550B-B Support Documentation
NE550B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 5.0
$39.23
Today
NE560B-B Support Documentation
NE560B-BØ1/2" Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 6.0
$39.23
Today

Ø25 mm Unmounted Absorptive ND Filters, AR-Coated: 650 - 1050 nm

Item # Transmission Dataa OD at 633 nmb Thicknessc
NE10B-B info 1.0 ± 0.05 1.9 mm
NE13B-B info 1.3 ± 0.065 2.5 mm
NE15B-B info 1.5 ± 0.08 2.9 mm
NE20B-B info 2.0 ± 0.1 1.4 mm
NE30B-B info 3.0 ± 0.15 2.1 mm
NE40B-B info 4.0 ± 0.2 2.8 mm
NE50B-B info 5.0 ± 0.25 3.6 mm
NE60B-B info 6.0 ± 0.3 1.5 mm
Item # Transmission Dataa OD at 633 nmb Thicknessc
NE01B-B info 0.1 ± 0.005 0.6 mm
NE02B-B info 0.2 ± 0.01 1.4 mm
NE03B-B info 0.3 ± 0.015 2.3 mm
NE04B-B info 0.4 ± 0.02 0.7 mm
NE05B-B info 0.5 ± 0.025 0.9 mm
NE06B-B info 0.6 ± 0.03 1.1 mm
NE07B-B info 0.7 ± 0.04 1.3 mm
NE08B-B info 0.8 ± 0.05 1.5 mm
NE09B-B info 0.9 ± 0.05 1.7 mm
  • Click the icon to view a plot of the typical filter transmission.
  • Measured before the AR coating is applied. See Transmission Data graphs for typical performance.
  • Values given are typical. The actual thickness of each ND filter is dependent on the optical density of the lot of glass used to manufacture each lot of ND filters.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NE01B-B Support Documentation
NE01B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.1
$62.76
Lead Time
NE02B-B Support Documentation
NE02B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.2
$62.76
Lead Time
NE03B-B Support Documentation
NE03B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.3
$60.34
Lead Time
NE04B-B Support Documentation
NE04B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm,OD: 0.4
$62.76
Today
NE05B-B Support Documentation
NE05B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.5
$62.76
5-8 Days
NE06B-B Support Documentation
NE06B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.6
$62.76
5-8 Days
NE07B-B Support Documentation
NE07B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.7
$62.76
Today
NE08B-B Support Documentation
NE08B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.8
$62.76
Today
NE09B-B Support Documentation
NE09B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 0.9
$62.76
Today
NE10B-B Support Documentation
NE10B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.0
$60.34
Lead Time
NE13B-B Support Documentation
NE13B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.3
$62.76
Today
NE15B-B Support Documentation
NE15B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 1.5
$62.76
Lead Time
NE20B-B Support Documentation
NE20B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 2.0
$60.34
Lead Time
NE30B-B Support Documentation
NE30B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 3.0
$62.76
Lead Time
NE40B-B Support Documentation
NE40B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 4.0
$62.76
Lead Time
NE50B-B Support Documentation
NE50B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 5.0
$62.76
Lead Time
NE60B-B Support Documentation
NE60B-BØ25 mm Neutral Density Filter, AR Coated: 650 - 1050 nm, OD: 6.0
$62.76
Today
Additional Neutral Density Filters: Absorptive/Reflective
  • Unmounted Absorptive ND Filters (Schott Glass)

  • Mounted Absorptive ND Filters (Schott Glass)

  • Unmounted Absorptive NIR ND Filters (Schott Glass)

  • Mounted Absorptive NIR ND Filters (Schott Glass)

  • Unmounted Absorptive ND Filters (A Coated)

  • Mounted Absorptive ND Filters (A Coated)

  • Unmounted Absorptive ND Filters (B Coated)

  • Mounted Absorptive ND Filters (B Coated)

  • Absorptive NIR ND Filters (C Coated)

  • Unmounted Reflective ND Filters (UV Fused Silica)

  • Mounted Reflective ND Filters (UV Fused Silica)

  • Unmounted Reflective ND Filters (N-BK7)

  • Mounted Reflective ND Filters (N-BK7)

  • Reflective ND Filters (ZnSe)

  • Wedged Reflective ND Filters (UVFS)

  • Wedged Reflective ND Filters (N-BK7)

  • Apodizing Reflective ND Filters

  • Variable ND Filters

  • ND Filter Kits

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