Full Aperture Obstruction Targets


  • Low-Reflectivity Chrome Targets: Ø50 µm - Ø2500 µm
  • Chrome OD ≥2.5 for the 400 - 1050 nm Wavelength Range
  • Ø1" Soda Lime Glass Substrates
  • >Ø22.86 mm Clear Aperture

R1D50P

Ø50 µm
Obstruction Target

R1D500P

Ø500 µm Obstruction Target

R1D2500P

Ø2500 µm Obstruction Target

Related Items


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General Specifications
Substrate Soda-Lime-Glass
Substrate Thickness 1.5 ± 0.2 mm
Substrate Diameter 25.4 +0.0 / -0.1 mm
Clear Aperture >22.86 mm
Obstruction Centration Tolerancea ±0.2 mm
Chrome Optical Density (OD) ≥2.5 (400 - 1050 nm) 
Transmitted Wavefront Error <λ @ 633 nm
Surface Quality 60-40 Scratch-Dig
  • X and Y tolerance of how centered the obstructions are on the substrate.
R1D200P Obstruction Target
Click to Enlarge

R1D1000P Obstruction Target Secured in the LMR1 Optic Mount

Features

  • Low-Reflectivity Chrome Obstruction Targets: Ø50 µm - Ø2500 µm
  • Obstructions Centered on Ø1" Soda Lime Glass Substrates
  • Chrome OD ≥2.5 (400 - 1050 nm)
  • >Ø22.86 mm Clear Aperture

Thorlabs' Full Aperture Obstruction Targets consist of a low-reflectivity chrome obstruction centered on a soda-lime glass substrate. The full aperture opening outside the obstruction diameter is >Ø22.86 mm. They are designed for applications such as zero-order beam blocking, investigating stray light, darkfield microscopy, or phase imaging.

The positive obstructions consist of low-reflectivity (AR coated) chrome, which reduces back reflections from the opaque chrome target improving imaging contrast. The AR coating results in < 10% light reflected from the target from 300 - 500 nm. Please see the Graphs tab for data on the AR coating over a wider wavelength range. The chrome target also provides an OD ≥2.5 from 400 - 1050 nm.

The targets can be secured in Ø1" optic mounts; translation mounts are available for precise target alignment along the XY or XYZ axes.

Item # R1D50P R1D100P R1D200P R1D300P R1D400P R1D500P R1D1000P R1D1500P R1D2000P R1D2500P
Obstruction Diameter Ø50 µm Ø100 µm Ø200 µm Ø300 µm Ø400 µm Ø500 µm Ø1000 µm Ø1500 µm Ø2000 µm Ø2500 µm
Obstruction Diameter Tolerance ±2 µm ±5 µm ±10 µm ±15 µm ±20 µm
Substrates Spectra
Click to Enlarge

Click Here to Download Transmission Data
This graph shows the transmission of the soda lime glass substrate.
Substrates Spectra
Click to Enlarge

Click Here to Download Target Data
This graph shows the spectral reflectance of low-reflectivity chrome (blue line) and soda-lime-glass (red line). The reflectance data of the soda-lime glass accounts for reflection returning from both the front and back surfaces of the substrate. In the 300 - 500 nm range, the low-reflectivity chrome positive obstruction targets reflect <10% of incident light.
Substrates Spectra
Click to Enlarge

Click Here to Download Target Data
The Optical Density of the Low-Reflectivity Chrome Obstructions vs. Wavelength

Posted Comments:
Ian Oldenburg  (posted 2023-10-23 16:39:19.78)
Can you make these full apperature obstruction targets on a 2inch optic?
cdolbashian  (posted 2023-10-27 04:46:42.0)
Thank you for reaching out to us with this inquiry. We indeed can make such an obstruction. I have contacted you directly to gather some more information regarding specifications of your custom.
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Full Aperture Obstruction Targets

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
R1D50P Support Documentation
R1D50PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø50 µm Target
$75.14
Lead Time
R1D100P Support Documentation
R1D100PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø100 µm Target
$75.14
7-10 Days
R1D200P Support Documentation
R1D200PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø200 µm Target
$75.14
7-10 Days
R1D300P Support Documentation
R1D300PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø300 µm Target
$75.14
7-10 Days
R1D400P Support Documentation
R1D400PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø400 µm Target
$75.14
7-10 Days
R1D500P Support Documentation
R1D500PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø500 µm Target
$75.14
Lead Time
R1D1000P Support Documentation
R1D1000PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø1000 µm Target
$75.14
Today
R1D1500P Support Documentation
R1D1500PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø1500 µm Target
$75.14
Today
R1D2000P Support Documentation
R1D2000PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø2000 µm Target
$75.14
Today
R1D2500P Support Documentation
R1D2500PØ25.4 mm Positive Obstruction Target, Soda Lime Glass, Ø2500 µm Target
$75.14
Today