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Threaded Manual Beam Shutter

  • Internal and External SM1 Threading
  • Lever-Activated, Light-Tight Shutter
  • Engraving Indicates Closed Position

Application Idea

Enclosed Beam Path with Shutter


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Shutter Selection Guide
Diaphragm Single-Blade
Ø1/4", Ø1/2", and Ø1"
Ø0.29" Manual
Ø1/2" and Ø1"
SM1 Manual Beam Shutter
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SM1SH1 Shown in the Open and Closed Positions
SM1 Manual Beam Shutter
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SM1SH1 Manual Beam Shutter Mounted in a CP33 Cage Plate
SM1 Manual Beam Shutter
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LMR1 Fixed Lens Mount Being Used to Post Mount the SM1SH1 Manual Beam Shutter


  • Open/Close Lever Positions
  • Internal and External SM1 Threading (1.035"-40)
  • SM1 Lens Tube System Compatible
  • Clear Aperture when Open: 7.2 mm (0.29")
  • Shutter is Completely Light-Tight

The SM1SH1 Manual Beam Shutter provides a convenient, labeled switch for propagating a beam through an optical assembly. The lever-actuated shutter is firmly held in position with a precision detent mechanism at both the opened and closed locations.

This aluminum shutter incorporates internal SM1 threads (1.035"-30) on one side and external SM1 threads on the other, making it ideal for use with our lens tube systems. The internally threaded side of the shutter has a metal plate enclosing the shutter mechanism designed to withstand high power and short pulsed beams. Therefore for best performance, this metal plate should face the incoming beam. 

Please note that we do not recommend using the SM1SH1 shutter within a 30 mm cage system, as the cage rods will interfere with the shutter's lever actuator. If it is used in a cage system, we recommend placing the shutter at the end of a branch, as shown in the photo above.

Posted Comments:
andreas.eckstein  (posted 2017-04-19 21:08:59.097)
Hi, we're using the SM1SH1 shutter to contain the output beam from our Coherent RegA (regenerative amplifier) with a pulse length of ca. 30fs and a CW-equivalent output power of ca. 1.5W, and it works very well; the shutter hardly feels warm, and several days of constant usage haven't left a mark on the shutter plate itself. However, this is true only if the shutter is built in metal-plate first. The fact that one of the plates enclosing the shutter mechanism is actually plastic is somewhat surprising, and gave us a nice cloud of blue smoke. An all-metal version of the shutter, possibly even a high-power version with steel plates, would be a nice addition. The existing version could be improved by simply printing arrows on the outer ring designating the preferred (i. e. non-smoke-producing) travel direction for high power/short pulse beams.
tfrisch  (posted 2017-05-16 10:16:35.0)
Hello, thank you for contacting Thorlabs. I have posted your feedback in our internal engineering forum, and I will reach out to you directly to discuss your application.
minami  (posted 2014-06-23 12:42:12.487)
How do you mount this shutter (SM1SH1) to a post?
myanakas  (posted 2014-06-27 08:19:09.0)
Response from Mike at Thorlabs: Thank you for your feedback. The SM1SH1 Threaded Beam Shutter can be post mounted using the SM1RC Lens Tube Slip Ring found here The SM1RC contains a bottom-located 8-32 tap that allows it to be directly connected to any of our 1/2" diameter posts found here Based on this feedback we have updated our website to include information on how the SM1SH1 can be post mounted.
jjurado  (posted 2011-05-09 15:31:00.0)
Response from Javier at Thorlabs to david.merino: Thank you very much for contacting us. We currently do not have a precise laser induced damage threshold value for this shutter; however, since the shutter material is aluminum, the power required in order to ablate it is in the order of tens to hundreds of Watts.
david.merino  (posted 2011-05-09 17:11:26.0)
What is the maximum power from a parallel beam that this shutter would handle? Thanks
Javier  (posted 2010-06-10 09:43:37.0)
Response from Javier at Thorlabs to jc7: yes, the lever would be blocked by the cage rods. We will look into designing a cage compatible shutter based on the SM1SH1. I will contact you directly with more details.
jc7  (posted 2010-06-09 17:39:40.0)
Hello, Would the lever of the SM1-Threaded Manual Beam Shutter (SM1SH1) be blocked by the rods of a 30mm cage system? Thank you, James.
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+1 Qty Docs Part Number - Universal Price Available
SM1SH1 Support Documentation
SM1SH1SM1-Threaded Manual Beam Shutter, Ø7.2 mm Clear Aperture
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