Prealigned for Reflective Beams to Exit Within ±20 arcmin of 90º
Thorlabs' CM1-BS, CM1-PBS and CM1-BP lines of beamsplitters provide additional flexibility when building optical devices from our 30 mm cage system and lens tube products. The mounted beamsplitters are aligned so that the exit beam is within ±20 arcmin of 90°. Due to this alignment, mounted beamsplitters can reduce the time needed for prototyping, experimenting, and production. Each cube can be mounted on imperial and metric posts by utilizing the included thread mounting adapters. Please click here to view all of our beamsplitter options, including the unmounted versions of the cube beamsplitters utilized in these offerings. An empty cube is also available so that customers can mount their own optics.
* Transmission and reflection data is based on that of the beamsplitter coating and does not account for the BBAR surface coating.
Cube Mounted Pellicle Beamsplitters
Item #
CM1-BP145B1
CM1-BP145B2
CM1-BP145B3
CM1-BP145B4
CM1-BP108
CM1-BP133
CM1-BP150
Wavelength
400 - 700 nm
700 - 900 nm
1.0 - 2.0 µm
3.0 - 5.0 µm
Uncoated
635 nm
635 nm
Splitting Ratio
45:55
8:92
33:67
50:50
Ports
4 Ports With SM1 (1.035"-40) Thread
Membrane Material
Nitrocellulose
Housing Material
Engraved Black Anodized Aluminum Housing
Membrane Thickness
2 µm
Temperature Range
-40 to 125 °C
Index of Refraction
1.5 at 550 nm
Scratch-Dig
40-20
Transmitted Wavefront Error
0.5λ Typcial
Reflected Wavefront Error
<λ/inch
Non-Polarizing Beamsplitter Cubes
Theoretical % Transmission of the Beamsplitting Surface
Theoretical % Reflectivity of AR Coating on the Faces of the Beamsplitting Cubes
CM1-BS013
Please Click on Graph for Data
CM1-BS014
Please Click on Graph for Data
CM1-BS015
Please Click on Graph for Data
Polarizing Beamsplitter Cubes
Pellicle Beamsplitter Plots
CM1-BP108
CM1-BP133
CM1-BP150
CM1-BP145B1
CM1-BP145B2
CM1-BP145B3
CM1-BP145B4
Note: The sinusoidal oscillation resulting from thin film interference effects has been averaged for these curves.
Cage System Overview
The Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision machined building blocks designed for high flexibility and accurate alignment. Among the most essential of these fundamental components are cage plates and cage assembly rods.
16 mm, 30 mm, and 60 mm Cage System Standards
Thorlabs offers three standards defined by the center-to-center spacing of the cage assembly rods (see image to right). The 16 mm SP series is designed for use with Ø1/4" and Ø1/2" optics. The 30 mm cage standard, using CP series cage plates, is ideally suited for compact assemblies based around Ø1/2" and Ø1” optics. Lastly, the 60 mm cage standard, using LCP series cage plates, is designed for Ø1” and Ø2” optics.
Standard Mating Parts
The flexibility inherent to the Cage Assembly System lies within its reliance on well-defined mounting and thread standards designed for direct interfacing with a wide range of specialized products.
The three most prevalent thread standards are our SM05 series (0.535”-40 thread), SM1 series (1.035”-40 thread), and SM2 series (2.035”-40 thread), all of which were defined to house the industries most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards.
A broad range of optomechanical positioning mounts and rigid construction components are designed for interfacing with the 16 mm, 30 mm, and 60 mm cage assembly rod spacing. (See Visual Navigation Product Overview).
Dimensions of Standard Plates
16 mm
30 mm
60 mm
Thread Series
SM05
SM1
SM2
Hole to Hole Length
16 mm, 0.63″
30 mm, 1.18″
60 mm, 2.36″
Total Length
25 mm, 0.98″
41 mm, 1.60″
71.1 mm, 2.8″
Total Depth
6.35 mm, 0.25″
8.9 mm, 0.35″
12.7 mm, 0.50″
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Posted Comments:
Poster: Thorlabs
Posted Date: 2010-08-03 13:08:33.0
Response from Javier at Thorlabs to Paul: Thank you for your update. I will take a look at our stock parts and evaluate them based on your input.
Poster: paulwb.at.work
Posted Date: 2010-08-02 20:09:24.0
Hi Javier, an update on the interference issue. I hadnt mounted actual beamsplitter cubes in the clamps until today, and the top plate of the cube clamp (the triangular section with felt on the underside) appears to have interference issues with the small ER screws. I have only tested this with one cube, but Im going to take a file to the other clamps just in case. Judging by the depth of the gouge left after my (a tad forceful--ahem) attempt at insertion, it should be a matter of a few strokes of the file.
Poster: Thorlabs
Posted Date: 2010-07-22 08:49:08.0
Response from Javier at Thorlabs to paul.at.work: Thank you for your feedback. We are discussing adding these changes to the CM1-4ER reusable cube internally. Having access to the three internal screws that hold the optic without having to dissasemble the mount is definitely an advantage, so we will look into adding clearance holes on the top of the cube. We will also investigate your second concern. I will keep you updated about any changes.
Poster: paulwb.at.work
Posted Date: 2010-07-21 15:32:10.0
Concerning the CM1-4ER.
I understand that some people need this cube to be light tight in different ways, but adding three holes in the top shell, giving access to the three cube holder screws, would allow the glass cube to be freed and adjusted manually from the side holes, without having to disassemble the rest of the cage mount setup. Drilling these out was not fun.
Also, I had to file down the four corners on the base plate as the small screws that the cage mount ER rods use caused interference when putting the top shell and the base plate together. 15 seconds with a coarse file was all that was needed per corner, but it still was tedious to do 9+ cubes.
Poster: jens
Posted Date: 2009-12-16 19:12:53.0
A reply from Jens at Thorlabs: you are right that at the moment the cage mounting holes and the cage connector holes if not used will result in a solution which is light tight solution. Our engineering team started to look into this and we will update the offering soon.
Poster: wankuang
Posted Date: 2009-12-16 18:28:00.0
Please separate lens tube mount from 30mm cage mount. Or create a separate cube only for lens tube. The threads for 30mm cage on the cube makes the cube not light tight.
Poster: klee
Posted Date: 2009-11-18 11:03:59.0
A response from Ken at Thorlabs to sunduo_0606: All the ports have internal SM1 thread, so you can use the SM1CP2 end cap to cover the unused side.
Poster: sunduo_0606
Posted Date: 2009-11-18 10:01:31.0
Hi,
I bought CM1-BS103 Cube Mounted Beam splitter from your company. I wonder is there any cap for it, which can protect the unused side.
Many thanks for your help.
Best regards,
Danny
Poster: Laurie
Posted Date: 2008-11-07 14:00:42.0
Response from Laurie at Thorlabs to jp.hadden: The CM1-4E cube mount does indeed accept our 1" beamsplitter cubes. I apologize if you found the presentation to be a bit confusing. We will endeavor to make it clearer.
Poster: jp.hadden
Posted Date: 2008-11-07 09:03:24.0
A bit confused about what size beamsplitter cube should fit into the empty cube.
I am presuming the 25.4mm cube is the right one - but the interior measuments dont seem to be clear on the specs or drawings (unless im mistaken)
Poster: Laurie
Posted Date: 2008-05-12 12:38:34.0
Response from Laurie at Thorlabs to cordero: The short answer to your question is that yes, a 26 x 37 x 1 mm dichroic filter can be mounted in the CM1-4E. However, we may have a better option, which involves using our C4W, B5C, and B4C together. I will personally email you with more details. Thank you for your interest in our products!
Poster: cordero
Posted Date: 2008-05-12 11:04:08.0
Hello
I need to mount a rectangular dichroic filter whose dimensions are 26 x 37 x1 mm in a 30 mm cage, at 45 degrees. So far, the CM1 prism/mirror cage cube mount has been the best possibility that I have found. Could you tell me if the filter will fit the cube? Also, how difficult ot would be to align the filter?
Thanks
Ms Cordero
3 Models Covering the Wavelength Range of 400 to 1600 nm
Splitting Ratio of 50:50
Four SM1-Threaded Ports
4-40 Tapped Holes for 30 mm Cage
Each mounted non-polarizing beamsplitter cube incorporates one of our 1" (25.4 mm) non-polarizing beamsplitter cubes into a housing that has four SM1-threaded (1.035"-40) access ports and a set of tapped holes that accept our Ø6 mm cage rods.
An antireflection coating is deposited on each face of the beamsplitting cube so as to minimize unwanted reflections (see the tabs above for specifications and typical performance plots).
Our CM1-PBS series of mounted polarizing beamsplitter cubes utilizes our 1" (25.4 mm) polarizing beamsplitter cubes. Each cube is mounted in a 30 mm cage system compatible housing, which also offers four SM1 threaded ports. As these cubes offer cage and lens tube system compatibility, they can be used in a variety of applications.
Eliminates Ghosting and Minimizes Dispersion
Various Splitting Ratios Available
30 mm Cage System Compatible
SM1-Threaded Ports
These cube-mounted pellicle beamsplitters virtually eliminate ghosting since the second surface reflection is superimposed on the first one. However, they are extremely fragile due to their 2 µm thick nitrocellulose membrane, which exhibits less than ½ wave of variation at 635 nm across its 25 mm diameter. To provide maximum protection from damage, these beamsplitters are housed inside a 30 mm cage-system-compatible cube, are post-mountable, and have SM1-threaded access ports, making them compatible with our entire line of Ø1" lens tubes and accessories. Please Note: The sinusoidal oscillation resulting from thin film interference effects has been averaged for the plot shown under the Graphs tab.
CM1-4E and CM1-4ER Compatible with 30 mm Cage System and SM1 Lens Tubes Four SM1-Threaded Ports Cube is Post Mountable via 8-32 or M4 Threaded Stud Accepts 1" Cubes and 25 mm Right Angle Prisms Prism Alignment Pins Provide Accuracy of ±20 arcmin
The CM1-4ER is similar to the CM1-4E, but does not require the optic to be glued in to the mount. Instead the optic is clamped within the CM1-4ER by tightening three screws. If you ever need to swap the optic in this mount or to use the optic in a different application, simply loosen the three screws to release the optic. The top image to the right shows a right angle prism mounted in a CM1-4ER with the outer housing removed.
The CM1-CC cube connector allows two or more CM1 style cubes to be connected as shown in the image above. Please note that the CM1-CC requires drilled holes on the CM1 cube next to the SM1 threaded ports as the cube connector has alignment pins. The current CM1 series CM1-4E and CM1-4ER empty cubes, mounted beamsplitters, and mounted turning mirrors are compatible with the cube connector. If you have an older CM1 series cube and would like it updated for free, please contact Technical Support.
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3 Models Covering the Wavelength Range of 400 to 1600 nm
CM1-BS013
- Cube-Mounted Polarization-Insensitive Beamsplitter, 400 - 700 nm
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Compatible with 30 mm Cage System and SM1 Lens Tubes
