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


  • Mounted Ø25 mm Round Filter
  • Optical Densities Ranging from 0.1 to 6.0
  • Ideal for Low-Power Applications (<1 W)

NE40A-B

NE50A-B

Application Idea

NE05A-B Mounted
in a DET36A2 Detector

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Features

  • Attenuate Light in the Near IR (650 - 1050 nm AR Coating)
  • Optical Densities Ranging from 0.1 to 6.0
  • Mounted Ø25 mm Filters
  • AR Coated to Reduce Back Reflections in an Optical System
  • Ideal for Low-Power Applications (<1 Watt)
  • Engraved with Coating Range and Part Number

Thorlabs is pleased to offer its most popular mounted absorptive neutral density filters with a broadband antireflection coating for the 650 - 1050 nm range deposited on both surfaces. These filters are mounted in engraved SM1L03 Ø1" lens tubes, which are compatible with a wide range of rigid optomechanical parts such as our cage systems and lens tubes. These filters are also available in unmounted versions or with a broadband AR coating for the 350 - 700 nm range. Please see the Selection Guide below and 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 reflectivity that is less than 0.5% over the specified wavelength range when light is normally incident on the filter surface. Typical transmission data may be found by clicking on the 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.

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 - 1700 nm)
Mounted Neutral Density Filter Kits
Unmounted

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 (%).

For lab safety, Thorlabs offers an extensive line of safety and blackout products that significantly reduces exposure to stray light.

Optical Density Substrate Substrate Thicknessa
0.1 NG11 0.6 mm
0.2 NG11 1.4 mm
0.3 NG11 2.3 mm
0.4 NG4 0.7 mm
0.5 NG4 0.9 mm
0.6 NG4 1.1 mm
1.0 NG4 1.9 mm
1.3 NG4 2.5 mm
2.0 NG9 1.4 mm
3.0 NG9 2.1 mm
4.0 NG9 2.8 mm
5.0 NG9 3.6 mm
6.0 NG1 1.5 mm
  • 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 25.0 mm
Diameter Tolerance +0.0 / -0.25 mm
Clear Aperture >90% Outer Diameter
Ravg (650 - 1050 nm) <0.5%
Surface Flatness (@ 633 nm) λ/4
Surface Quality 40-20 Scratch-Dig
Parallelism 10 arcsec
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.

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

Item # Transmission Dataa ODb Thicknessc
NE13A-B info 1.3 2.5 mm
NE20A-B info 2.0 1.4 mm
NE30A-B info 3.0 2.1 mm
NE40A-B info 4.0 2.8 mm
NE50A-B info 5.0 3.6 mm
NE60A-B info 6.0 1.5 mm
Item # Transmission Dataa ODb Thicknessc
NE01A-B info 0.1 0.6 mm
NE02A-B info 0.2 1.4 mm
NE03A-B info 0.3 2.3 mm
NE04A-B info 0.4 0.7 mm
NE05A-B info 0.5 0.9 mm
NE06A-B info 0.6 1.1 mm
NE10A-B info 1.0 1.9 mm
  • The shaded region in the popup graphs denotes the wavelength range of the AR coating.
  • Measured at 633 nm.
  • 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
NE01A-B Support Documentation
NE01A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.1
$74.59
Today
NE02A-B Support Documentation
NE02A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.2
$74.59
Today
NE03A-B Support Documentation
NE03A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.3
$76.96
Today
NE04A-B Support Documentation
NE04A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.4
$74.59
Today
NE05A-B Support Documentation
NE05A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.5
$74.59
Today
NE06A-B Support Documentation
NE06A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 0.6
$74.59
Today
NE10A-B Support Documentation
NE10A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD:1.0
$76.96
Today
NE13A-B Support Documentation
NE13A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 1.3
$74.59
Today
NE20A-B Support Documentation
NE20A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 2.0
$76.96
Today
NE30A-B Support Documentation
NE30A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 3.0
$74.59
Today
NE40A-B Support Documentation
NE40A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 4.0
$74.59
Today
NE50A-B Support Documentation
NE50A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 5.0
$74.59
Today
NE60A-B Support Documentation
NE60A-BØ25 mm AR-Coated Absorptive Neutral Density Filter, 650-1050 nm, SM1-Threaded Mount, OD: 6.0
$74.59
Today
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