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Apodizing Reflective ND Filters


  • Apodizing and Reverse Apodizing Filters
  • Change Intensity Profile Between Gaussian and Flat
  • Ø25 mm Filters Available Mounted or Unmounted

NDY10B

Apodizing Filter

NDYR20A

Reverse Apodizing Filter

NDYR20B

Reverse Apodizing Filter

NDY20A
Apodizing Filter
Mounted on an
LMR1 Fixed
Lens Mount

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General Specificationsa
Diameter (Unmounted) 25.0 +0.0/-0.25 mm
Clear Aperture >90% Unmounted Diameter
Surface Flatness <5λ @ 632.8 nm
Surface Quality 60-40 Scratch-Dig
  • For Full List of Specs, See the Specs Tab
Optic Cleaning Tutorial

Features

  • Change Beam's Intensity Profile
    • Gaussian to Near-Flat Top (Apodizing)
    • Flat to Near-Gaussian (Reverse Apodizing)
  • Continuously Variable Attenuation from 0.04 - 1 or 0.04 - 2 OD
  • Usable Range: 350 - 1100 nm
  • Available Mounted or Unmounted
    • Unmounted Filters: 25 mm (0.98") Outer Diameter
    • Mounted Filters: Housed in SM1-Threaded (1.035"-40) Lens Cell that is Engraved with the Part Number and Optical Density Range

Thorlabs’ Apodizing and Reverse Apodizing Filters are designed to augment the intensity profile of a beam to provide smooth intensity profiles and even illumination. An apodizing filter reshapes a Gaussian profile into a near-flat-top, constant-intensity beam, while a reverse apodizing filter reshapes a flat-top profile into a near-Gaussian intensity distribution. These filters are ideal for even illumination and condensing systems as well as improving the dynamic range of imaging systems. For instance, apodizing filters are employed in astronomy to differentiate low-intensity sources from brighter, neighboring sources. This technique even allows planets close to a bright star to be imaged.

Both the apodizing and reverse apodizing filters are coated with a reflective metallic layer that has a near-Gaussian density distribution. For the apodizing filters, this distribution starts with a coated center and continuously falls off to the uncoated edge. For the reverse apodizing filters, the distribution starts with an uncoated center and continuously rises to the dark edge (see Graphs tab for more details). These Ø25 mm filters are available either unmounted or integrated into a mount featuring internal SM1 threads (1.035"-40) on one side and external SM1 threads on the other. To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C.

General Specifications
Diameter 25.0 +0.0/-0.25 mm
Clear Aperture >90% of Outer Diameter
Substrate N-BK7a
Substrate Thickness 1.0 ± 0.25 mm
Surface Flatness (Over Clear Aperture) <5λ at 632.8 nm
Surface Quality 60-40 Scratch-Dig
Parallelism <3 arcmin
  • Click Link for Detailed Specifications on the Substrate
Item # NDY10A
NDY10B
NDY20A
NDY20B
NDYR10A
NDYR10B
NDYR20A
NDYR20B
Optical Density @ Edge 0.04 OD 0.04 OD 1.0 OD 2.0 OD
Transmission @ Edge 91.2% 91.2% 10% 1%
Optical Density @ Center 1.0 OD 2.0 OD 0.04 OD 0.04 OD
Transmission @ Center 10% 1% 91.2% 91.2%

Optical Density

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 reflection of the incident light. For higher transmission and less reflection, 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.

Apodizing Filters

1 - 0 OD Apodizing Filter
Click to Enlarge

Click Here for Raw Data
2 - 0 OD Apodizing Filter
Click to Enlarge

Click Here for Raw Data

 

Reverse Apodizing Filters

0 - 1 OD Reverse Apodizing Filter
Click to Enlarge

Click Here for Raw Data
0 - 2 OD Reverse Apodizing Filter
Click to Enlarge

Click Here for Raw Data

Posted Comments:
ypk  (posted 2018-10-22 02:11:30.023)
Will the product work for 1 mm diameter He-Ne laser beam. If not, can you please give a customary quote for the same.
YLohia  (posted 2018-10-22 09:58:39.0)
Hello, thank you for contacting Thorlabs. Unfortunately, this filter is not suitable for a 1mm diameter beam. I will contact you directly to discuss the possibility of offering a custom filter.
kirk.mckenzie  (posted 2015-10-17 19:13:34.97)
This is a great product. I would like this to be made for a 1mm beam (that is 10x smaller than the current version). I would be happy to by such a product as a custom job. If possible please quote me on 10 of modified version of ND20A. Thank you! Kirk
besembeson  (posted 2015-10-27 05:44:15.0)
Response from Bweh at Thorlabs USA: We will contact you via email for a custom quotation if possible since we will need new mask designs to get the desired profile for such a beam diameter.

Unmounted Apodizing Filters

  • Ø25 mm, Unmounted Apodizing Filters for 350 - 1100 nm
  • 0.04 to 1 OD or 0.04 to 2 OD Radially Variable Coating (Edge to Center)
  • Produces a Near-Flat Intensity Profile from a Gaussian Input

Thorlabs’ Ø25 mm apodizing filters produce a near-flat-top intensity profile from a Gaussian input. These unmounted filters are compatible with any Ø1" optical mount capable of accepting a 1.0 mm thick optic (such as the LMR1, SCL03, or CP33). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDY10B Support Documentation
NDY10BCustomer Inspired! Unmounted Ø25 mm Apodizing Reflective ND Filter, OD: 0.04 - 1
$199.11
5-8 Days
NDY20B Support Documentation
NDY20BCustomer Inspired! Unmounted Ø25 mm Apodizing Reflective ND Filter, OD: 0.04 - 2
$199.11
Today

Unmounted Reverse Apodizing Filters

  • Ø25 mm, Unmounted Reverse Apodizing Filters for 350 - 1100 nm
  • 0.04 to 1 OD or 0.04 to 2 OD Radially Variable Coating (Center to Edge)
  • Produces a Near-Gaussian Intensity Profile from a Flat-Top Input

Thorlabs’ Ø25 mm apodizing filters produce a near-Gaussian profile from a constant, flat-top input. These unmounted filters are compatible with any Ø1" optical mount capable of accepting a 1.0 mm thick optic (such as the LMR1, SCL03, or CP33). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDYR10B Support Documentation
NDYR10BCustomer Inspired! Unmounted Ø25 mm Reverse Apodizing Reflective ND Filter, OD: 0.04 - 1
$199.11
Today
NDYR20B Support Documentation
NDYR20BCustomer Inspired! Unmounted Ø25 mm Reverse Apodizing Reflective ND Filter, OD: 0.04 - 2
$199.11
Today

Mounted Apodizing Filters

  • Ø25 mm, Mounted Apodizing Filters for 350 - 1100 nm
  • 0.04 to 1 OD or 0.04 to 2 OD Radially Variable Coating (Edge to Center)
  • Produces a Near-Flat Intensity Profile from a Gaussian Input

Thorlabs’ Ø25 mm apodizing filters produce a near-flat-top intensity profile from a Gaussian input. These mounted filters featuring internal and external SM1 (1.035"-40) threading, making them compatible with any SM1-threaded mount (such as the LMR1 or TRF90). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDY10A Support Documentation
NDY10ACustomer Inspired! Mounted Ø25 mm Apodizing Reflective ND Filter, OD: 0.04 - 1
$215.34
Today
NDY20A Support Documentation
NDY20ACustomer Inspired! Mounted Ø25 mm Apodizing Reflective ND Filter, OD: 0.04 - 2
$215.34
Today

Mounted Reverse Apodizing Filters

  • Ø25 mm, Mounted Apodizing Filters for 350 - 1100 nm
  • 0.04 to 1 OD or 0.04 to 2 OD Radially Variable Coating (Center to Edge)
  • Produces a Near-Gaussian Intensity Profile from a Flat-Top Input

Thorlabs’ Ø25 mm reverse apodizing filters produce a near-Gaussian profile from a constant, flat-top input. These mounted filters featuring internal and external SM1 (1.035"-40) threading, making them compatible with any SM1-threaded mount (such as the LMR1 or TRF90). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NDYR10A Support Documentation
NDYR10ACustomer Inspired! Mounted Ø25 mm Reverse Apodizing Reflective ND Filter, OD: 0.04 - 1
$215.34
Today
NDYR20A Support Documentation
NDYR20ACustomer Inspired! Mounted Ø25 mm Reverse Apodizing Reflective ND Filter, OD: 0.04 - 2
$215.34
Today
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