Cube-Mounted Pellicle Beamsplitters


  • No Ghosting or Beam Displacement
  • No Chromatic Aberration with Uncollimated Beams
  • SM1 and 30 mm Cage System Compatible

CM1-CC

CM1-BP145B1

CM1-BP145B3

Michelson Interferometer
with Pellicle Beamsplitter

Application Idea

Related Items


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General Specifications
Ports 4, all SM1 Threaded (1.035"-40)
Membrane Material Nitrocellulose
Housing Material Engraved Black Anodized Aluminum
Membrane Thickness 2 µm, 5 µm for 300-400 nm Version
Temperature Range -40 to 70 °C
Index of Refraction 1.5 at 550 nm
Surface Quality 40-20 Scratch-Dig
Transmitted Wavefront Error 0.5λ (Typical)
Reflected Wavefront Error 1λ (Typical)
Item # (Click to View) Wavelength Splitting Ratio
(R:T)
CM1-BP108 Uncoated,
400 nm - 2.4 µm
8:92
CM1-BP145B5 300 - 400 nm 45:55
CM1-BP145B1 400 - 700 nm 45:55
CM1-BP133 635 nm 33:67
CM1-BP150 635 nm 50:50
CM1-BP145B2 700 - 900 nm 45:55
CM1-BP145B3 1 - 2 µm 45:55
CM1-BP145B4 3 - 5 µm 45:55

Features

  • Eliminates Ghosting
  • No Chromatic Aberration with Focused Beams
  • Minimal Change in Optical Path Length
  • SM1-Threaded Entrance and Exit Ports
  • 30 mm Cage System Compatible
  • Connect Two Cage Cubes Side by Side with the CM1-CC Cage Cube Connector

Thorlabs' Ø1" mounted pellicle beamsplitters are ideal for use in applications where chromatic dispersion must be minimized (i.e. cases where focused beams are necessary). These beamsplitters virtually eliminate ghosting since the second surface reflection is superimposed on the first one. However, they are extremely fragile due to the nitrocellulose membrane being microns thick, which exhibits less than 1/2 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. The cubes are post-mountable and have SM1-threaded access ports, making them compatible with our entire line of Ø1" lens tubes and accessories. The cubes are M6 x 0.5 threaded, but include 8-32 and M4 mounting adapters. These Beamsplitter cubes can also be connected to other cage cubes with cage rods and our ERSCB adapters.

Cube Mounted Pellicle Beamsplitter with Port Hole Cover
Click to Enlarge
CM1-BP145B3 Shown with Two SM1CP2 Port Hole Covers (Sold Separately)

Please Note: Pellicle beamsplitters exhibit sinusoidal oscillations in the splitting ratio as a function of wavelength, due to thin film interference effects. See the Thin Film Tutorial tab for more details. These sinusoidal oscillations can be clearly seen in the plots below.

The engraving on the top of the mounts indicates the direction of incident light. This direction is consistent with the light being incident upon the coated surface of the beamsplitter first.

Thorlabs offers three types of mounted beamsplitters: Non-Polarizing Beamsplitting Cubes, Polarizing Beamsplitting Cubes, and the Pellicle Beamsplitters presented below. A large variety of unmounted beamsplitters are also available. For a direct comparison of the performance of our non-polarizing beamsplitting cube, plate, and pellicle at 633 nm, see the Lab Facts tab.

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

Handling Precautions
Our pellicle beamsplitters are manufactured from an extremely thin and fragile membrane. Please do not touch the membrane under any circumstances. Compressed or canned air can be used to clean these beamsplitters, but please exercise caution as the force of the air may be large enough to damage the membrane. Aim the stream of air such that it makes a small angle with the surface, and hold the can sufficiently far away to avoid damaging the membrane. If the pellicle becomes damaged, please contact tech support for information about replacement of the beamsplitter; in these cases, we only charge for the cost of the pellicle.

Thorlabs Lab Fact: Beamsplitter Package Matters

We present laboratory measurements of the polarization angle, split ratio, and total throughput power of a beam transmitted through Thorlabs plate, cube, and pellicle beamsplitters. While all non-polarizing beamsplitters function similarly, the exact performance is different for different types of beamsplitter. Each type of beamsplitter contains its own advantages and disadvantages compared to other types of beamsplitters. Appropriate choice of beamsplitter is essential to sensitive experimental systems. We present a complete analysis and comparison of optical parameters for three common types of non-polarizing beamsplitters.

For our experiment we used the former generation HRS015 stabilized HeNe laser (replaced by the HRS015B) as the light source for our investigation. A linear polarizer is used to set the laser beam's polarization axis to 45° in order to provide equal s- and p-polarized light incident on the beamsplitter. The beamsplitter under investigation was then placed in the beampath, and its split beams directed to appropriate detectors. The total power though the optic, polarization states, split ratios, and angle of incidence effects were investigated under this configuration.

Lab Facts Complete Summary

The plots below summarize the measured results for all three types of beamsplitters. From these graphs the performance of each optic can be easily compared to one another. The bottom left plot summarizes the results for the total power throughput for each optic. The total power throughput is measured as the fraction of input power. While the plate and pellicle beamsplitters perform rather similarly, the cube shows signs of absorption inside the optic. Additionally, this plot shows the relative insensitivity of throughput power to angle of incidence. The bottom middle graph summarizes the results for the output polarization angle for each optic. The cube shows the most similar polarization angles between the reflected and transmitted beams, with the plate producing the largest difference in polarization between beams. The bottom right plot summarizes the results for the split ratio, as a fraction of input power, for the beamsplitters. Here it can be shown that the plate beamsplitter demonstrates the most ideal for 50/50 power splitting. For details on the experimental setup employed and the results summarized here, please click here.

Beamsplitter Selection Guide

Thorlabs' portfolio contains many different kinds of beamsplitters, which can split beams by intensity or by polarization. We offer plate and cube beamsplitters, though other form factors exist, including pellicle and birefringent crystal. For an overview of the different types and a comparison of their features and applications, please see our overview. Many of our beamsplitters come in premounted or unmounted variants. Below is a complete listing of our beamsplitter offerings. To explore the available types, wavelength ranges, splitting/extinction ratios, transmission, and available sizes for each beamsplitter category, click More [+] in the appropriate row below.

Plate Beamsplitters

Non-Polarizing Plate Beamsplitters
Polarizing Plate Beamsplitters
  • 45° AOI Unless Otherwise Noted
  • 30 arcmin Wedge on Round Optics Only
  • Designed for use with P-polarized light.

Cube Beamsplitters

Non-Polarizing Cube Beamsplitters
Polarizing Cube and Polyhedron Beamsplitters

Pellicle Beamsplitters

Non-Polarizing Pellicle Beamsplitters

Crystal Beamsplitters

Polarizing Crystal Beamsplitters
  • Mounted in a protective box, unthreaded ring, or cylinder.
  • Available unmounted or mounted in a protective box or unthreaded cylinder.

Other

Other Beamsplitters

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 Beamsplitters Polarizing Beamsplitters High Power Polarizing Beamsplitters
Non-Polarizing Beamsplitter Cube Polarizing Beamsplitter Cube High-Power Polarizing Beamsplitter Cube
Pellicle Beamsplitter Laser Line Polarizing Beamsplitters Circular Polarizer
Pellicle Beamsplitters Laser Line Polarizing Beamsplitter Cube Circular / Variable Polarizers
Penta Prisms Turning Mirrors Variable Beamsplitters/Attenuators
Penta Prisms Turning Mirrors Variable Beamsplitters / Attenuators

30 mm Cage Cube Empty Optic Mounts Selection Guide

Dichroic Mirror Holder Empty Compact Cage Cube
Rectangular Dichroic Mirrors and Filters Empty Compact 30 mm Cage Cube

Thin-Film Interference Effect

Reflectance Curve showing Thin-Film Interference Effects

The plots below, which show transmission as a function of wavelength, depict a sinusoidal fluctuation that is caused by interference effects. These effects will occur for all pellicle beamsplitters and are sometimes averaged out when data is displayed.

The graph to the right depicts the actual measured percent reflectance of an 8:92 beam sampler without averaging the sinusoidal oscillations that result from thin film interference. The frequency and amplitude of the pattern depends on four factors: the thickness of the film, the thickness of any coating present, the angle of incidence of the incoming light, and the polarization of the incoming light.

Q: What is a thin film?
A layer of material is referred to as a thin film if the thickness of the layer is on the order of the wavelength of incident radiation in the film medium. The relationship between the wavelength of light in air and that in the film is given by

Relationship between wavelength in air and film

For the pellicle beamsplitters featured here, the information under the Specs tab states that nfilm = 1.5 at 550 nm. Therefore, for this incident wavelength, the wavelength in the pellicle membrane itself is

Wavelength of 550 nm light in pellicle beamsplitter


Posted Comments:
Mengnan Xu  (posted 2024-06-17 14:05:43.957)
Hi. I would like to know the clear aperture of CM1-BP145B3. And how about the parallelism tolerance of the two surfaces of the pellicle beamsplitter in the cube. Also, I would appreciate if you have the flatness information of the pellicle beamsplitter.
cdolbashian  (posted 2024-06-28 11:43:58.0)
Thank you for reaching out to us with this inquiry. Typically the CA is ~90% of the optical surface. In this case, since the beamsplitter itself is 1", then the CA would be ~22.8mm. That being said, the beamsplitter is oriented 45° with respect to the normal surface of the cube, and thus the horizontal CA will be further reduced by a factor of √2 ~ 1.41 yielding approximately 16.2mm horizontal CA and 22.8mm vertical CA. While we do not have the flatness information, the parallelism is 1 fringe per 1" at 633nm.
Vincent Mall  (posted 2023-09-14 14:42:00.583)
Hello, I am looking to use the CM1-BP145B2 as a beam merger and I was wondering if it makes a difference from which direction the beam enters the Beamsplitter. Is the transmit/reflect behavior of the splitter the same on the front- and backside of the pellicle? Kind regards
cdolbashian  (posted 2023-09-25 11:28:09.0)
Thank you for reaching out to us with this inquiry. We expect very similar performance when this component is used in reverse.
Nathan Schorn  (posted 2023-02-02 10:15:33.053)
Hello, I am inquiring about your BP108 pellicle beam splitter (8:92 R:T ratio). I was wondering if it is possible to get a pellicle that is the reverse. Where it reflects 92% of the beam and only transmits 8%. Thank you! Nathan Schorn
cdolbashian  (posted 2023-02-17 01:54:02.0)
Thank you for reaching out to us with this inquiry Nathan! This is potentially something we can do. I have contacted you directly to discuss this potential custom. For future custom requests, please feel free to contact our Solutions team: TechSales@thorlabs.com.
Scott P  (posted 2022-06-01 11:12:21.633)
What is the angular precision is between the pellicle and cube for its rated wavelengths? I did not see it listed. Specifically CM1-BP145B1.
jdelia  (posted 2022-06-02 08:26:48.0)
Thank you for contacting Thorlabs. We specify a +/- 20 arcmin angular tolerance. This can be found called out in the lower left-hand corner of our CAD drawing.
eirini.tagkoudi  (posted 2018-03-19 16:07:08.15)
I would like to kindly ask you what is the damage threshold for the specific pellicle beam-splitter since i am using high peak power lasers and I am not sure if this optical component is the most suitable. Thank you in advance.
YLohia  (posted 2018-03-30 01:02:41.0)
Hello, thank you for contacting Thorlabs. While the laser induce damage threshold is still an undetermined spec for CM1-BP145B3, we recommend limiting the incident CW power density to 2 W/cm^2 for the coated pellicles in general as a guideline. Unfortunately, we currently do not have a pulsed LIDT spec.
kbeloshenko  (posted 2018-01-29 12:25:59.283)
Dear sir! Please tell me what components I need to use for prepare the Michelson Interferometer with Pellice Beamsplitter. I would like to use 400-1000 nm optical range. Very best regards Konstantin Beloshenko
tfrisch  (posted 2018-02-06 11:08:43.0)
Hello, thank you for contacting Thorlabs. Strictly speaking, a Michelson interferometer requires a source, a beamsplitter, two mirrors, and a viewing screen or detector. Then, optomechanical components are required to align those. We have a Michelson Interferometer Educational Kit (see link below). Even if that is more than you are looking for, we list the kit components so you can pick the pieces you want for your application. That would be a good place to start, but I will reach out to you directly to discuss your needs. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10107&tabname=Kit%20Components
schneider  (posted 2017-09-28 12:41:33.773)
Just a hint: I use CM1-BP108 pellicle beamsplitters in an optical trap to split the laser to a segmented position detector (PDQ80A). The problem is, that when I use them in reflection, the pellicle acts as a microphone membrane picking up the noise in the lab (pumps etc.), which results in several peaks in my frequency spectra due to the membrane vibrations and, thus, a shift of the laser in the detector. In transmission the laser is almost unaffected by the pellicle.
tfrisch  (posted 2017-10-02 07:02:44.0)
Hello, thank you for contacting Thorlabs. Because the transmitted wavefront error is a refractive effect and the path length is very short, I'd expect the transmitted path to be affected far less by vibrations as you note. I will reach out to you directly to discuss your application.
roland.bege  (posted 2015-06-24 11:03:00.127)
I have a beam splitter CM1-BP108 uncoated. My question is, what is the damage threshold if I have a collimated beam with a diameter of 3 mm. I would like to us it for powers up to 5 W at around 1100 nm. Thanks
besembeson  (posted 2015-08-18 12:24:13.0)
Response from Bweh at Thorlabs USA: The uncoated pellicle will withstand that power level, cw or pulsed. Note that localized heating of the film may change the thickness slightly causing a change in the R/T. Changing the incidence angle will help tune the R/T ratio if critical for application.
steven.woodruff  (posted 2013-06-24 12:20:28.693)
This looked to be what I needed, then looked at the cad drawing. The beamsplitter is circular and needs to be elliptical so that there is full beam transmission through the BS. Look at reflector telescopes to see the usefulness of an elliptical mirror, it has a circular shape when viewed at 45 degrees. Steve
tcohen  (posted 2013-07-11 16:25:00.0)
Response from Tim at Thorlabs: Thank you for your feedback. We do carry elliptical mirrors but currently all of our pellicles are circular. I am checking into our ability to provide this and I will contact you to keep you updated.
jlow  (posted 2013-01-04 09:44:40.02)
Response from Jeremy at Thorlabs: If the pellicle inside is damaged, we can take back the cube-mounted pellicle for repair. In such a case, we will only charge the price of the replacement pellicle.
farrell  (posted 2012-12-21 17:28:21.01)
I am worried about the lifetime of cube mounted Pellicle beam splitter. I agree they are better protected, however they are also 4 times more expensive than the unmounted type. Is it possible to purchase an unmounted type an insert it into the cube as a replacement if/when needed?
tcohen  (posted 2012-07-05 14:03:00.0)
Response from Tim at Thorlabs: We currently do not have empirical data for the CM1-BP145B1 LIDT. However, we recommend not exceeding 2W/cm^2 for these beamsplitters. Please use this as a reference, but note that other factors, as described in our LIDT tutorial at http://www.thorlabs.de/tutorials.cfm?tabID=27503, will vary this number.
doron.azoury  (posted 2012-07-05 15:21:35.0)
Can you provide the damage threshold of CM1-BP145B1 (pellical beamsplitter), for cw laser? Thanks.
tcohen  (posted 2012-05-01 19:07:00.0)
Response from Tim at Thorlabs: Thank you for your feedback. You are correct that these are averaged graphs and that individual parts will have oscillations from interference. We note this in the footnote as you mentioned and also provide a “Tutorial” tab on the Pellicle Beamsplitters page describing this interference effect. If you would like to see an example of this curve for a specific part number, please contact us at techsupport@thorlabs.com so we may provide you with this data.
user  (posted 2012-05-01 11:32:42.0)
The thin film interference referred to in the footnote to the graphs can be excessive. The graphs are from averaged data that hides these oscillations. Ask for a representative graph prior to purchase.
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8:92 (R:T) Cube-Mounted Pellicle Beamsplitter, Uncoated: 400 - 2400 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP108 Support Documentation
CM1-BP108Cube-Mounted Pellicle Beamsplitter, 8:92 (R:T), Uncoated, 400 - 2400 nm
$280.35
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45:55 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 300 - 400 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP145B5 Support Documentation
CM1-BP145B530 mm Cage Cube-Mounted Pellicle Beamsplitter, 45:55 (R:T), 300 - 400 nm
$325.49
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45:55 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 400 - 700 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

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+1 Qty Docs Part Number - Universal Price Available
CM1-BP145B1 Support Documentation
CM1-BP145B130 mm Cage Cube-Mounted Pellicle Beamsplitter, 45:55 (R:T), 400 - 700 nm
$325.49
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33:67 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 635 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP133 Support Documentation
CM1-BP13330 mm Cage Cube-Mounted Pellicle Beamsplitter, 33:67 (R:T), 635 nm
$312.44
Lead Time
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50:50 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 635 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP150 Support Documentation
CM1-BP15030 mm Cage Cube-Mounted Pellicle Beamsplitter, 50:50, 635 nm
$312.44
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45:55 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 700 - 900 nm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP145B2 Support Documentation
CM1-BP145B230 mm Cage Cube-Mounted Pellicle Beamsplitter, 45:55 (R:T), 700 - 900 nm
$325.49
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45:55 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 1.0 - 2.0 µm

Click Here for Raw Data for the 250 – 2500 nm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP145B3 Support Documentation
CM1-BP145B330 mm Cage Cube-Mounted Pellicle Beamsplitter, 45:55 (R:T), 1 - 2 µm
$325.49
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45:55 (R:T) Cube-Mounted Pellicle Beamsplitter, Coating: 3.0 - 5.0 µm

Click Here for Raw Data for the 0.25 – 20.0 µm Wavelength Range

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CM1-BP145B4 Support Documentation
CM1-BP145B430 mm Cage Cube-Mounted Pellicle Beamsplitter, 45:55 (R:T), 3 - 5 µm
$325.49
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Cage Cube Connector

C4W-CC Application
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View Imperial Product List
Item #QtyDescription
C4W130 mm Cage Cube
C6W130 mm Cage Cube, Ø6 mm Through Holes
CCM1-4ER1Compact Clamping 4-Port Prism/Mirror 30 mm Cage Cube, 8-32 Tap
C4W-CC130 mm Cage Cube Connector for C4W and C6WR Series Cubes
CM1-CC1Cage Cube Connector for Compact 30 mm Cage Cubes
View Metric Product List
Item #QtyDescription
C4W130 mm Cage Cube
C6W130 mm Cage Cube, Ø6 mm Through Holes
CCM1-4ER/M1Compact Clamping 4-Port Prism/Mirror 30 mm Cage Cube, M4 Tap
C4W-CC130 mm Cage Cube Connector for C4W and C6WR Series Cubes
CM1-CC1Cage Cube Connector for Compact 30 mm Cage Cubes
A C4W and C6W Cage Cube connected to a 1.5" wide CCM1-4ER Compact Cage Cube using the C4W-CC and CM1-CC Cube Connectors, respectively.
CM1-CC Application
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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
CM1-CC Connecting Multiple 1.5" Wide Cage Cubes
  • Connect Two 1.5" Wide Cage Cubes Side by Side
  • Connect a 1.5" Wide Cage Cube to a 2" Wide Cage Cube
  • Compatible with CM1 or CCM1 Series Cage Cubes

The CM1-CC cage cube connector allows two or more CM1 or CCM1 style cubes to be connected as shown in the image to the right. The CM1 and CCM1 series of cage cubes, which are all compatible with this connector, include empty cubes, empty dichroic cubes, mounted beamsplitters, mounted penta prisms, and mounted turning mirrors. The CM1-CC cage cube connector includes four 4-40 button-head screws, two 4-40 flat-head screws, four washers, and a 1/16" hex key.

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.

We also offer the C4W-CC to connect two 2" wide 30 mm cage cubes. Both C4W-CC and CM1-CC cage cube connectors can be used to connect one 1.5" wide 30 mm cage cube, such as our CCM1-4ER(/M), with a 2" wide 30 mm cage 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
$53.47
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