Cage System Covers

  • Enclose a Beam Path Within a 16 mm, 30 mm, or 60 mm Cage System
  • Sold in Packs of 4, Each 24" Long


For 16 mm Cage


For 30 mm Cage


For 60 mm Cage

Application Idea

The C30L24 and C60L24 covers shown enclosing a cage system.

CP33 Cage Plates

30 mm to 60 mm Cage Plate Adapter

Related Items

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16 mm Cage System Cover
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Every cover has a tab that creates an extra light seal layer and helps in installing and removing in a cage system.
16 mm Cage System Cover
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C16L24 cage system covers are shown enclosing a 16 mm cage system. Each cover features tracks that allow it to snap onto the cage rods.  


  • 24" Long Snap-On Covers for 16 mm, 30 mm, or 60 mm Cage Systems
  • Block Stray or Unwanted Light
  • Keep Beam Path Clean of Dust and Other Contaminants
  • Easy to Cut to Desired Length; See the Cutting Tutorial Tab
  • Sold in Packs of 4

Thorlabs' Cage System Covers are designed to enclose 16 mm, 30 mm, or 60 mm cage systems. They can protect users from stray beams or wavelengths that are invisible to the naked eye, as well as prevent ambient light, dust, and other contaminants from accessing the beam path. Made from high impact polystyrene plastic, the cage covers are sold in 24" lengths, which can be easily cut to the desired length by the user; see the Cutting Tutorial tab for details.

Each cover features a tab on one side that provides an additional light seal and an area to grip during installation and removal. The covers snap onto the cage rods, as shown in the images to the right. To remove, simply pull the tab to release the cover.

Please note that these cage system covers are not light tight and should not be used in high-power applications.

To Cut the Cage System Covers: 

Click to Enlarge

Step 1: Measure the length required to cover the cage system setup.

Click to Enlarge

Step 2: Using a utility knife or saw, score the legs of the cover at the desired length.

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Step 3: Bend the cover until it snaps along the scored cuts.

Posted Comments:
Felix Beinlich  (posted 2021-07-21 10:34:03.28)
I can just agree with Yongjin. Cutting as indicated in the tutorial is not working at all. The edges are completely askew and thus do not cover the end areas where the adapter/optic plates are. Without a mitre box saw this product is absolutely not working.
YLohia  (posted 2021-07-29 02:40:26.0)
Thank you for the feedback. We're sorry to hear about the difficulty in getting this product to work as advertised. We will consider revising the web documentation to better reflect this.
Yongjin Sung  (posted 2020-10-22 19:53:05.657)
The cutting is painful. The suggested method (cut the leg and snap) does not make a sharp edge (hope you try it yourself). I tried a hot knife, which worked better but is not perfect. It is also very tricky to use. Can you please provide any other suggested cutting method?
llamb  (posted 2020-10-26 05:00:27.0)
Thank you for your feedback. For a sharper edge, you can consider using a mitre box saw, which can be acquired at hardware stores for relatively cheap. I have reached out to you directly to discuss cutting options as well.
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Cage System Covers

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
C16L24 Support Documentation
C16L2416 mm Cage System Cover, 24" Long, Pack of 4
C30L24 Support Documentation
C30L24Customer Inspired! 30 mm Cage System Cover, 24" Long, Pack of 4
C60L24 Support Documentation
C60L2460 mm Cage System Cover, 24" Long, Pack of 4