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SM1-Threaded Irises and Shutter


  • Lever- or Ring-Actuated Irises with Ø12 mm or Ø25 mm Maximum Aperture
  • Lever-Activated Shutter (Ø7.2 mm Clear Aperture)

SM1D12SZ

Zero-Aperture
Lever-Actuated Iris

SM1D12C

Graduated
Ring-Actuated Iris

SM1SH1

Beam Shutter

SM1D12SS

Stainless Steel
Lever-Actuated Iris

Application Idea

SM1D12C Ring-Actuated Iris
in a 30 mm Cage System

Related Items


Please Wait
Item # Type Control Min Aperture Max Aperture
SM1D12 Spring Steel Iris Lever Ø0.8 mm Ø12 mm
SM1D25 Spring Steel Iris Lever Ø1 mm Ø25 mm
SM1D12SS Stainless Steel Iris Lever Ø0.9 mm Ø11.9 mm
SM1D12SZ Spring Steel Iris Lever Zero Ø11.9 mm
SM1D12D Spring Steel Iris Ring Ø0.8 mm Ø12 mm
SM1D12C Spring Steel Iris Graduated Ringa Ø1 mm Ø12 mm
SM1D12CZ Spring Steel Iris Graduated Ringa Zero Ø12 mm
SM1SH1 Shutter Open/Close Lever Zero Ø7.2 mm
  • The graduated ring has an engraved scale that indicates the actual diameter of the iris in millimeters to within ±0.5 mm.
SM-Threaded Irises
SM05
SM1
SM2
SM3

Features

  • Lever or Ring Aperture Control
  • SM1 (1.035"-40) Internally and Externally Threaded
  • Maximum Aperture up to Ø25 mm (Ø0.98")
  • Zero Aperture Irises Block All Incoming Light in Closed Position

Thorlabs offers internally and externally SM1-Threaded Irises and Beam Shutters for full compatibility with our Ø1" Lens Tubes and other SM1-threaded components. This allows for the easy integration of the components into an optomechanical construction. The irises are housed in an anodized aluminum casing. The leaves of the iris pivot within the outer ring housing and are designed for long-lasting performance over several thousand cycles. The SM1SH1 Beam Shutter is lever-activated for opening and closing the aperture.


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SM1-Threaded, Lever-Actuated Iris Diaphragms

  • SM1 (1.035"-40) Threaded on Both Sides
  • Lever-Controlled, Max Aperture up to Ø25 mm
  • Black Spring Steel and Stainless Steel Leaf Versions Available
  • Zero-Aperture Version Available

These lever-actuated iris diaphragms are SM1-threaded for compatibility with our Ø1" lens tubes and other SM1-threaded accessories. The housing of each iris features an engraved arrow which indicates the direction the lever must be moved to close the aperture.

Our SM1D12 and SM1D25 iris diaphragms offer maximum apertures up to Ø12 mm and Ø25 mm, respectively. The SM1D12 iris has internal SM1 threading on one side and external SM1 threading on the other side (see drawing to the right). Our SM1D25 iris has internal SM1 (1.035"-40) threading on both sides of the housing (see drawing to the right) as well as a full Ø25 mm aperture.

The SM1D12SS iris features stainless steel leaves for use in higher power applications than traditional spring steel irises. The aperture can be continuously varied from the maximum aperture diameter of 11.9 mm to a minimum aperture diameter of 1.0 mm. The lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. An engraved arrow indicates the position the lever must be in to close the iris. We use a magnetic stainless steel in this iris. Due to its hardness, it offers a longer lifetime than typical non-magnetic stainless steel. This iris also has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other.

The SM1D12SZ zero-aperture iris diaphragm is continuously variable from the maximum aperture diameter of 11.9 mm to completely closed (zero aperture). Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. The iris leaves are made from black spring steel and the lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. These irises feature an engraved arrow on the housing which indicates the direction the lever must be moved to close the aperture. As the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris. This housing has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other.

The setscrews on the housings of these irises retain the internal aperture mechanism within the housing and should not be adjusted.

SM1D12 Diagram
Click to Enlarge

SM1D12 Mechanical Diagram
SM1D25 Diagram
Click to Enlarge

SM1D25 Mechanical Diagram
SM1D12SS Diagram
Click to Enlarge

SM1D12SS Mechanical Diagram
SM1D12SZ Diagram
Click to Enlarge

SM1D12SZ Mechanical Diagram
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1D12 Support Documentation
SM1D12SM1 Lever-Actuated Iris Diaphragm (Ø0.8 - Ø12 mm)
$61.68
Today
SM1D25 Support Documentation
SM1D25Customer Inspired! SM1 Lever-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
$95.77
5-8 Days
SM1D12SS Support Documentation
SM1D12SSSM1 Lever-Actuated Stainless Steel Iris Diaphragm (Ø1 - Ø11.9 mm)
$76.29
Today
SM1D12SZ Support Documentation
SM1D12SZSM1 Lever-Actuated Zero Aperture Iris Diaphragm, Ø11.9 mm Max Aperture
$78.73
Today

SM1-Threaded, Ring-Actuated Iris Diaphragms

  • SM1 (1.035"-40) Threaded on Both Sides
  • Ring-Controlled, Ø12 mm Max Aperture
  • Graduated and Zero-Aperture Versions Available
  • Black Spring Steel Leaves
  • Locking Setscrew with 0.05" (1.3 mm) Hex

These ring-actuated iris diaphragms are SM1-threaded for compatibility with our Ø1" lens tubes, 30 mm cage systems, and other SM1-threaded accessories. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components. The design of these irises is well suited for integration into a cage system with minimal alignment. To precisely optimize the centration of the iris hole to the optical axis of the cage system, Thorlabs recommends mounting the iris on an XY Translation Mount.

The SM1D12D is our standard SM1-threaded, ring-actuated iris with a Ø12 mm maximum aperture. Thorlabs also offers the CP20S Iris for 30 mm Cage Systems which is integrated into a cage plate for direct mounting to cage rods.

The SM1D12C Graduated Iris offers an additional laser-engraved scale, which indicates the actual diameter of the iris in millimeters to within ±0.5 mm. In applications where the iris cannot be easily viewed, such as the lens tube configuration shown to the lower right, this engraved scale greatly simplifies the process of optimizing the iris diameter.

The SM1D12CZ Zero-Aperture Graduated Iris provides the added benefit of being able to close completely. Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. When the ring is in the closed position, the iris aperture is completely closed (zero aperture), unlike a standard iris, which has a non-zero diameter aperture when in the minimum position. Please note that as the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris.

SM1D12D Diagram
Click to Enlarge

SM1D12D Mechanical Diagram
SM1D12C Diagram
Click to Enlarge

SM1D12C Mechanical Diagram
SM1D12CZ Diagram
Click to Enlarge

SM1D12CZ Mechanical Diagram
SM1D12C Application
Click to Enlarge

SM1D12C Shown Between Two SM1 Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1D12D Support Documentation
SM1D12DSM1 Ring-Actuated Iris Diaphragm (Ø0.8 - Ø12 mm)
$71.15
5-8 Days
SM1D12C Support Documentation
SM1D12CSM1 Graduated Ring-Actuated Iris Diaphragm (Ø1 - Ø12 mm)
$109.29
Today
SM1D12CZ Support Documentation
SM1D12CZSM1 Graduated Ring-Actuated Zero Aperture Iris Diaphragm, Ø12 mm Max Aperture
$124.44
5-8 Days

SM1-Threaded Manual Beam Shutter

  • On/Off Lever Position
  • Clear Aperture when Open: Ø7.2 mm
  • Internal and External SM1 Threads

The positions of the SM1SH1 Manual Beam Shutter are conveniently labeled Open and Closed. The lever-actuated shutter is firmly held in position with a precision detent mechanism at both the opened and closed locations. The shutter has internal SM1 lens tube threads on one side and external SM1 threads on the other side, which makes it ideal for use with our lens tube systems and cage assemblies. The shutter has a Ø0.29" (Ø7.2 mm) clear aperture when open.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1SH1 Support Documentation
SM1SH1SM1-Threaded Manual Beam Shutter, Ø7.2 mm Clear Aperture
$61.14
Today
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