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Cage Cube for Rectangular Optics

  • Holds a Rectangular Optic up to 3 mm Thick at 45° AOI
  • 30 mm Cage System and Ø1" Lens Tube Compatible
  • Secure a Dichroic, Beamsplitter, Mirror, Polarizing Bandpass Filter, or Another Optic


Integrated Filter Mount

Related Items

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CM1-DCH with Lens Tube and Cage System
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The CM1-DCH is 30 mm Cage and SM1 Lens Tube compatible.
CM1-DCH Flat Head Screw for Cover Removal and Filter Replacement
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Two Flat Head Hex Screws are used for Cube Cover Removal and Filter Replacement


  • Mount Rectangular Dichroic Mirrors and Other Optics up to 3 mm Thick
  • Four SM1-Threaded (1.035"-40) Through Ports for Emission and Excitation Filter Attachment
  • 30 mm Cage System Compatible

The CM1-DCH dichroic filter cube holds a rectangular optic, such as a dichroic mirror, beamsplitter, silver mirror, or polarizing bandpass filter up to 36 mm wide, 26 mm tall, and 3 mm thick using an integrated clamp. Its compact size compared to other filter cage cubes reduces the distance between cage components. Two flat head hex screws on the base of the cube can be unscrewed with a 1.5 mm hex key to detach the base from the cube housing, allowing access to the integrated clamp (see the photo below right).

Emission and excitation filters can also be mounted into short lens tubes and attached to the SM1-threaded ports for a full fluorescence imaging filter setup (see the Application tab for more information). CM1-DCH cubes have four 4-40-threaded holes on each face for 30 mm cage system integration and are post mountable via an 8-32 (M4) tap. The cubes can also be connected sequentially using the CM1-CC cage cube connector sold below. Cage cubes can also be connected with cage rods by using our ERSCA Rod Adapters.

Please note: The filter holder base features a modified FFM1 filter holder mount. Our catalog FFM1 is not compatible with the CM1-DCH. Additional CM1-DCH bases may be ordered as a special by contacting tech support.

For a complete selection of our cube-mounted optics please see the Mounted Optics Guide tab.

Fluorescence Filter Set Application

The CM1-DCH can be used along with two SM1L03 lens tubes to hold a complete imaging filter set within a cage system. The emission and excitation filters are mounted in the 0.3" lens tubes attached to the cage cube. Mouse over the photo to see the corresponding components in the table to the right.

Dichroic Cage Cube Imaging Filters Dichroic Cube Rod Rod Rod Rod Rod Rod Rod Rod Rod Rod Rod Rod Imaging Filter Lens Tube
Product DescriptionQty.Photo
(Click to Enlarge)
CM1-DCH Dichroic Cube 1 Dichroic Cage Cube
SM1L03 0.3" Long Lens Tube 2 0.3 inch Lens Tube
Fluorescence Filter Set 1 Fluorescence Filter Set
ER Cage Rods 12 ER Cage Rod

30 mm Cage-Cube-Mounted Optics Selection Guide

The table below provides links to all of our 30 mm Cage-Cube-Mounted optics. For our selection of 16 mm Cage-Cube-Mounted Optics, please see our 16 mm Cage Systems guide.

Non-Polarizing BeamsplittersPolarizing BeamsplittersHigh Power Polarizing Beamsplitters
Non-Polarizing Beamsplitter CubePolarizing Beamsplitter CubeHigh-Power Polarizing Beamsplitter Cube
Pellicle BeamsplitterLaser Line Polarizing BeamsplittersCircular Polarizer
Pellicle BeamsplittersLaser Line Polarizing Beamsplitter CubeCircular / Variable Polarizers
Penta PrismsTurning MirrorsVariable Beamsplitters/Attenuators
Penta PrismsTurning MirrorsVariable Beamsplitters / Attenuators

30 mm Cage Cube Empty Optic Mounts Selection Guide

 Dichroic Mirror HolderEmpty Compact Cage Cube
Rectangular Dichroic Mirrors and FiltersEmpty Compact 30 mm Cage Cube

Posted Comments:
user  (posted 2020-09-17 03:01:56.77)
Hi, Is this product for the right turning of light beam? Can I use it as a left-turning mount? Thanks.
YLohia  (posted 2020-09-17 01:34:00.0)
Hello, thank you for contacting Thorlabs. This can be used in either scenario -- the direction of the reflection will depend on the orientation of the FFM1 in the cube mount.
Sami Arja  (posted 2019-11-12 20:14:11.947)
Dear Thorlabs, Is it possible to use the CM1 with BS013 by purchasing the bottom part separately? I am interested to know if I can have a cage mount that is compatible with both DCH/M and BS013. Your advice is highly appreciated. Sami
YLohia  (posted 2019-11-13 10:43:59.0)
Hello Sami, thank you for contacting Thorlabs. The CM1 cannot be used with the BS013 as we don't not offer suitable plates to adapt cubed optics to the CM1 system. We do, however, offer the CCM1-4ER, which would be a good fit for your application.
Gregor Jotzu  (posted 2019-10-18 09:19:58.903)
Dear Thorlabs Team, it would be great to be able to purchase only the part that holds the filter separately. I have a setup where we use the filter cube in a cage construction and it is possible to remove the filter. It would be great if one can replace the filter. I am aware of the DFM1, but there are parts of our seput where we prefer the CM1-DCH. Sincerely, Gregor Jotzu
llamb  (posted 2019-10-22 11:21:40.0)
Hello Gregor, thank you for your feedback. We can certainly offer the bottom assembly of the CM1-DCH as a custom product for now, and I have posted this idea in our internal engineering forum for further review as its own product release. I have reached out to you directly to discuss quoting the bottom assembly as a custom product for the time being.
Craig Prater  (posted 2019-07-31 19:13:05.797)
I just bought one of this and I'm not loving this product. I had been considering using it in an OEM application, but the filter mount does not seem very stable. I can apply slight pressure to the edge of a dichroic installed in this unit filter rock between two positions. I'd like this product if the mounting of the filter in this mount could be more stable and secure for example more like the DFM1. I just don't 'need the kinematic mounting feature (or extra size and cost) of the DFM1.
YLohia  (posted 2019-08-01 10:50:07.0)
Hello, thank you for your feedback. We are always looking for different ways of improving our products. I have posted your comments on our internal engineering forum for further consideration.
schnell  (posted 2017-05-18 14:33:18.503)
How well do these cage cubes hold the rectangular plate beamsplitters from your catalog? I wonder if they provide a stable enough mount to serve as a beamsplitter for interferometry. Also, will the cube hold the plate beamsplitter well enough when mounted vertically, e.g. the output port is facing down? Thank you!
nbayconich  (posted 2017-05-25 05:57:11.0)
Thank you for contacting Thorlabs. I will reach out to you directly regarding the CM1-DCH mounting capabilities. We also have the DFM1 cage cube or the B5C1 cage cube optic mount for Ø1" diameter optics as alternative mounting options.
lothar.schmid  (posted 2014-09-26 22:49:51.087)
The protrusions on the bottom plate partly block the 1'' holes, so that lens tubes cannot be screwed completely in. filing the protrusions down a bit solves the problem, but that's not what I expected from a thorlabs product.
cdaly  (posted 2014-10-11 04:47:06.0)
Response from Chris at Thorlabs: I will contact you directly to discuss this. There should not be an issue when attaching a standard 1" lens tube (SM1Lxx) to the cube as seen in the overview tab of this webpage.
sharrell  (posted 2012-09-13 08:43:00.0)
Response from Sean at Thorlabs: Thank you for sharing your feedback. Even though you were able to find the information you needed on the lens tube compatibility, we'll endeavor to make this information more obvious on the page through adding additional photos of the cube with an SM1 lens tube.
gir  (posted 2012-09-12 23:07:38.0)
I just realized my previous question is answered (in the affirmative) on the overview page. My apologies.
gir  (posted 2012-09-12 22:58:34.0)
Can I mate a SM1LXX lens tube into one of the ports?

Dichroic Cage Cube

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CM1-DCH Support Documentation
CM1-DCHCustomer Inspired! 30 mm Cage Cube with Dichroic Filter Mount
+1 Qty Docs Part Number - Metric Price Available
CM1-DCH/M Support Documentation
CM1-DCH/MCustomer Inspired! 30 mm Cage Cube with Dichroic Filter Mount (Metric)

Cage Cube Connector

CM1-CC Application
Click to Enlarge

View Imperial Product List
Item #QtyDescription
BA2T21Adjustable Mounting Base, 2" x 3" x 3/8"
CM1-CC2Cage Cube Connector for Compact 30 mm Cage Cubes
CCM1-BS014130 mm Cage Cube-Mounted Non-Polarizing Beamsplitter, 700 - 1100 nm, 8-32 Tap
CCM1-PBS252130 mm Cage Cube-Mounted Polarizing Beamsplitter Cube, 620-1000 nm, 8-32 Tap
CCM1-4ER1Compact Clamping 4-Port Prism/Mirror 30 mm Cage Cube, 8-32 Tap
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR21Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
View Metric Product List
Item #QtyDescription
BA2T2/M1Adjustable Mounting Base, 50 mm x 75 mm x 10 mm
CM1-CC2Cage Cube Connector for Compact 30 mm Cage Cubes
CCM1-BS014130 mm Cage Cube-Mounted Non-Polarizing Beamsplitter, 700 - 1100 nm, 8-32 Tap
CCM1-PBS252130 mm Cage Cube-Mounted Polarizing Beamsplitter Cube, 620-1000 nm, 8-32 Tap
CCM1-4ER/M1Compact Clamping 4-Port Prism/Mirror 30 mm Cage Cube, M4 Tap
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
Two CM1-CC Connectors used to Connect Multiple 1.5" Wide Cage Cubes
  • Connect Two 1.5" Wide Cage Cubes Side by Side
  • Compatible with CM1 and CCM1 Series Cage Cubes

The CM1-CC cube connector allows two or more cubes to be connected as shown in the image to the right. Many of our cage cubes are compatible with this connector, including empty cubes, empty dichroic cubes, mounted beamsplitters, mounted penta prisms, and mounted turning mirrors.

Two cage cube-mounted turning mirrors cannot be connected using the CM1-CC due to a lack of Ø6 mm cage rod holes on two sides of the cube.

Alignment Pins
Please note that because dowel alignment pins are used, the connector requires drilled holes on the cube face between the SM1-threaded (1.035"-40) ports. If you have an older cube and would like it updated to have alignment holes for free, please contact Technical Support. Alternatively, the alignment pins are press-fit inside their mounting holes, and can be pressed out for use with cubes that do not have these alignment holes.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-CC Support Documentation
CM1-CCCage Cube Connector for Compact 30 mm Cage Cubes
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