Square Precision Pinholes


  • Precision Pinholes in Blackened Stainless Steel Foils
  • Mounted in Ø1" Disks
  • Pinhole Sizes from 100 μm to 1 mm Square

S100QK

S200QK

S1000QK

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Features

  • Square Pinhole Sizes from 100 µm to 1 mm
  • Stainless Steel Foils with Black-Oxide Conversion Coating
  • Radius of Curvature of the Corners: ≤5 µm
  • Mounted in Ø1" Black-Anodized-Aluminum Housings

Single, mounted, precision square pinholes offer small optical apertures for applications with a small field of view, such as direct imaging of samples or creating a digital hologram. Square pinholes allow for increased sensitivity due to more efficient tiling compared to circular pinholes. The pinholes offered here use stainless steel foils with a black-oxide conversion coating, are available in sizes from 100 µm to 1 mm, and are mounted in Ø1" black-anodized-aluminum housings.

Precision Pinhole and Slit Options
Thorlabs' precision pinholes and optical slits are available with an assortment of fabrication materials and coatings. The choice of a particular size and material should depend on the application. Low-power applications may benefit more from the absorbance of blackened stainless steel foils. High-power applications may need the high damage threshold and reflectance of gold-plated copper foils, the high melting point and lower reflectance of our tungsten foils, or the high melting point of our molybdenum foils paired with the low reflectance (4% @ 800 nm) of their black-coated front side. Please see the Foil Materials and Foil Reflectance tabs for more information. Our stocked pinhole and slit offerings are summarized in the table to the right.

In addition to single pinholes, Thorlabs also offers pinhole wheels that contain 16 radially-spaced pinholes that are lithographically etched onto a chrome-plated fused silica substrate. These wheels allow the user to test multiple pinhole sizes within a setup.

If you do not see what you need among our stock pinhole and slit offerings, it is possible to special order pinholes and slits that are made with different foil materials, have different hole sizes and shapes, incorporate multiple holes in one foil, or provide different hole configurations. Customized pinhole housings are also available. Please contact Tech Support to discuss your specific needs.

Upon request, these pinholes are available with item-specific test reports at an additional cost. Please contact Tech Support for details.

Item # Pinhole
Size
Pinhole Dimensional
Tolerance
Radius of Curvature
of Pinhole Corners
Foil
Thickness
Pinhole
Material
Housing
Material
Housing
Size
S100QK 100 µm x 100 µm ±4 µm ≤5 µm 50 µm 300 Series Stainless Steel,
Black-Oxide Conversion Coating
6061-T6 Aluminum Ø1"
S200QK 200 µm x 200 µm ±6 µm
S500QK 500 µm x 500 µm ±10 µm
S1000QK 1000 µm x 1000 µm

Precision Pinholes and Slits
Thorlabs offers precision pinholes with blackened stainless steel, gold-plated copper, tungsten, or molybdenum foils. Our pinholes with stainless steel foils are blackened on both sides for increased absorbance and are available from stock in circles from Ø1 µm to Ø2 mm and squares from 100 µm x 100 µm to 1 mm x 1 mm. Our pinholes with gold-plated copper foils, plated with gold on one side and black-oxide coated on the reverse, are available with pinhole diameters from 5 µm to 2 mm. Our pinholes with tungsten foils are uncoated and available with pinhole diameters from 5 µm to 2 mm. Lastly, our pinholes with molybdenum foils have an absorptive polymer coating on the front sides and are available with pinhole diameters from 5 µm to 2 mm. We also offer slits in blackened stainless steel foils from stock with slit widths from 5 to 200 µm.

If you do not see what you need among our stock pinhole and slit offerings, it is also possible to special order pinholes and slits that are made with different foil materials, have different hole sizes and shapes, incorporate multiple holes in one foil, or provide different hole configurations. Please contact Tech Support to discuss your specific needs. For more information on the properties of the bulk materials from which the pinholes are fabricated, see the table below.

Material Properties
Depending on the application, it can be important to consider the material properties of the pinhole or slit. The material used to construct the aperture can have varying levels of melting point, density, and thermal conductivity, as detailed in the table below.

Material Properties
Material 300 Series Stainless Steela Copperb Tungsten Molybdenumc
Melting Point 1390 - 1450 °C 1085 °C 3422 °C 2623 °C
Density 8.03 g/cm3 8.96 g/cm3 19.25 g/cm3 10.28 g/cm3
Brinell Hardness 170 MPa 878 MPa 2570 MPa 1500 MPa
Damage Thresholdd (10 ns Pulse, 1 kHz @ 355 nm) 1.54 MW/mm2 4.82 MW/mm2 9.39 MW/mm2 6.34 MW/mm2
Thermal Expansion Coefficient 16.2 (µm/m)/°C 16.7 (µm/m)/°C 4.5 (µm/m)/°C 5.0 (µm/m)/°C
Specific Heat @ 20 °C 485 J/(K*kg) 385 J/(K*kg) 134 J/(K*kg) 250 J/(K*kg)
Thermal Conductivity 16.2 W/(m*K) 401 W/(m*K) 173 W/(m*K) 138 W/(m*K)
Thermal Diffusivity @ 300 K 3.1 mm2/s 111 mm2/s 80 mm2/s 54.3 mm2/s
  • Stainless steel pinholes and slits are blackened on both sides to increase absorbance. The material properties will be predominantly that of bulk stainless steel.
  • Gold-plated copper pinholes have a thin coating of gold on one side of the bulk copper foil. With a beam incident on this side, reflectance will be that of gold (95% @ 800 nm) while thermal properties will be predominantly copper-based.
  • Molybdenum pinholes have an absorptive coating on the front side. The material properties will be predominantly that of bulk molybdenum.
  • Damage threshold data refers to the bulk materials listed here only.

Reflectance Graphs of Foil Materials and Coatings

The reflectance of the foil material or coating affects performance in a variety of applications. Below are presented reflectance graphs for the materials and coatings that are offered with our circular and square precision pinholes, as well as our mounted optical slits. The raw reflectance data can be found here

Click to Enlarge
The front of the molybdenum foil circular precision pinholes have a low-reflectance absorptive polymer coating. The rear of these pinholes leaves the molybdenum foil bare.
Click to Enlarge
The front of the gold-plated copper foil circular precision pinholes have a low-reflectance PVD black coating. The rear of these pinholes leaves the gold-plated copper foil bare.
Apertures Selection Guide
Aperture Type Representative Image
(Click to Enlarge)
Description Aperture Sizes Available from Stocka
Single Precision Pinholesa
Circular Pinholes in Stainless Steel Foils Ø1 µm to Ø2 mm
Circular Pinholes in Gold-Plated Copper Foils Ø5 µm to Ø2 mm
Circular Pinholes in Tungsten Foils Ø5 µm to Ø2 mm
Circular Pinholes in Molybdenum Foils Ø5 µm to Ø2 mm
Square Pinholes in Stainless Steel Foils 100 to 1000 µm Square
Slitsa 3 mm Long Slits in Stainless Steel Foils Slit Widths: 5 to 200 µm
Annular Apertures Annular Aperture Obstruction Targets on
Quartz Substrates with Chrome Masks
Ø300 µm or Ø2 mm Pinholes with ε Ratiosb of 0.85, 
Ø1 mm Pinholes with ε Ratiosb of 0.05 0.1, or 0.85
Pinhole Wheels Manual, Mounted, Chrome-Plated Fused Silica Disks
with Lithographically Etched Pinholes
Each Disk has 16 Pinholes from Ø25 µm to Ø2 mm and
Four Annular Apertures (Ø100 µm Hole, 50 µm Obstruction)
Motorized Pinhole Wheels with Chrome-Plated Glass Disks
with Lithographically Etched Pinholes
Each Disk has 16 Pinholes from Ø25 µm to Ø2 mm and
Four Annular Apertures (Ø100 µm Hole, 50 µm Obstruction)
  • Single precision pinholes and slits can be special ordered with different aperture sizes, foil materials, shapes, and hole distributions than those offered from stock. Please contact Tech Support with inquiries.
  • Ratio of the Obstruction Diameter to the Pinhole Diameter

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