SM1 Lens Tube Compatible Cage Plates
SM1-Threaded (1.035"-40) cage plates and cage cubes allow SM1 Lens Tubes to be integrated into 30 mm Cage Systems by threading the lens tube into the plate. Alternatively, the CP12 cage plate has a Ø1.2" bore through the part, which allows an SM1 lens tube to be slid into it and then locked in place.
Thorlabs introduced the SM Series Threading standards to ensure compatibility over a broad range of product lines. SM-Threaded components offer a simple and efficient solution for building optomechanical structures. The SM-Threaded products available, which include lens tubes and cage system components, fixed and kinematic mounts, irises and diaphragms, and mounted optics, provide flexibility when constructing complex optical systems.
This page contains our SM1-Compatible Cage Plates. For a full selection of available Cage Plates, please visit our Cage Systems navigation menu.
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The CP02(/M) is 0.35" thick and provides a center-located SM1 (1.035"-40) threaded bore that is compatible with our popular Ø1" lens tubes. The center-threaded bore of the CP02(/M) can also directly accept a Ø1" optic up to 0.2" (5 mm) thick. Two SM1RR retaining rings are included. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key.
The CP02T(/M) is 0.5" thick, and allows two cage assemblies to be joined end-to-end. The extra thickness and double locking 4-40 setscrews enable two extension rods to be inserted and firmly locked into place, allowing for a rigid connection of two cage system subassemblies. The center-located SM1 (1.035"-40") tapped hole directly accepts Ø1" optics up to 0.35" (8.89 mm) thick. Two SM1RR retaining rings are included.
For additional convenience, an 8-32 (M4) tapped hole is provided on both cage plates for post mounting applications.
At 4 mm, 6 mm, and 8 mm thick, respectively, the CP4S, CP6S, and CP8S are the thinnest cage plates we offer. They have a center-located SM1 (1.035"-40) threaded bore that is compatible with our SM1 threaded optomechanical components. These plates allow the close spacing of optical components within a cage system. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key. Unlike the CP02(/M) and the CP02T(/M) sold above, these cage plates do not offer an 8-32 (M4) tapped hole for post mounting.
Pictured to the right is the CP4S cage plate being used to mount a SM1FC FC/PC Fiber Adapter Plate within a cage system.
The CP08(/M) improves upon the popular CP02(/M) design providing the same center-located SM1 (1.035"-40) threaded bore and 8-32 (M4) mounting hole, but a more stable clamping mechanism for our standard ER rods. This cage plate uses an enhanced clamping mechanism that increases the surface area in contact with the ER rods. The CP08(/M) uses four side-located 4-40 (M3) cap screws for securing the ER rods. The center-threaded bore of the CP08(/M) can also directly accept a Ø1" optic up to 0.2" (5 mm) thick just like the CP02(/M). One SM1RR retaining ring is included.
The CP12 cage plate is desinged to allow our SM1 Lens Tubes to slide into the cage plate and be locked in position with a nylon-tipped setscrew. This is ideal for situations where it is not desirable to thread the lens tube into one of our threaded cage plates. It will also allow our Ø1.2" free-space isolator packages to be integrated into a 30 mm cage system. A double-bore design gives three points of contact for stable and secure mounting. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key.
Please note that this cage plate does not feature a tapped mounting hole, unlike many of our other cage plates. Due to the bore size, there would be interference between the threaded stud on our Ø1/2" posts and the clear aperture of the bore. Therefore, this cage plate cannot be used directly with Ø1/2" Posts, and a cage system utilizing this plate must be supported using a different method. For a post-mountable solution, consider our SM1RC or SM1TC lens tube clamps, but note that these parts are not cage compatible.
The CP07 and CP07T are ideal for mounting small cage subassemblies into optomechanical mounts designed for Ø2" optics (such as our KS2 Ø2" kinematic mirror mount) or SM2-series threads (such as our SM2-series lens tubes). Both plates feature an SM1 (1.035"-40) tapped hole for mounting Ø1" optics up to 0.2" (5 mm) thick. Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key. One SM1RR retaining ring is included. Pictured to the right is the CP07T cage plate being used in a 4-axis alignment system that can be used with laser diode modules and fiber collimators.
The CP07 has a smooth Ø2" outer diameter, which works well with Ø2" mounts with a setscrew, while the CP07T has SM2 (2.035"-40) external threads.
Thorlabs' 30 mm cage to Ø1/2" post adapters allow the integration of our post-mounted components into our 30 mm cage system. The front face of this clamp is similar to the CP02(/M) cage plate and accommodates our Ø6 mm ER cage rods which are secured using the side-located locking setscews and are 30 mm apart. The center-located SM1 (1.035"-40) threaded bore, which is compatible with our popular Ø1" lens tubes, directly accepts a Ø1" optic up to 0.19" (4.8 mm) thick. Two SM1RR retaining rings are included.
The tail stock of this adapter has a double-bored through-hole and a spring-loaded thumbscrew that provide three-point contact for Ø1/2" posts for secure placement. Two versions are available, providing either 10 mm [CPTR10(/M)] or 20 mm [CPTR20(/M)] separation between the post center and the back of the cage plate.
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QRC1A Quick-Release Clamp Mounted Within a 30 mm Cage System
The QRC1A cage mount is equipped with a spring-loaded dovetail clamp that secures or releases the cage mount to two of the four ER rods in the cage structure. The cage plate has internal SM1 threading that allows for components up to 0.2" (5 mm) thick to be secured with the included SM1RR retaining ring. In addition, components up to 5/16" (7.9 mm) thick (not including length of threaded stub, OD = 1.2" (30 mm)) with external SM1 threading can be attached without sacrificing the ability to remove the cage plate from a closed cage system. For instance, all of the SM1 threaded ND filters can be used with this cage plate.
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STK01 Removable 30 mm Cage Plate Being Mounted Within a 30 mm Cage System
The STK01 cage plate allows Ø1" optics to be inserted or removed from a closed 30 mm cage structure. The cage plate uses two bands that are locked in place with the internal SM1 (1.035"-40) threading Ø1" optics up to 0.20" (5mm) thick to be secured in the cage plate using the included SM1RR retaining ring. In addition, components up to 5/16" (7.9 mm) thick (not including length of threaded stub, OD = 1.2" (30 mm)) with external SM1 threading can be attached without sacrificing the ability to remove the cage plate from a closed cage system. For instance, all of the SM1 threaded ND filters can be used with this cage plate.
The CP90F consists of a back plate compatible with the 30 mm cage system and a mounting carriage (front plate) that is magnetically coupled with pairs of rare earth magnets to the back plate. For stability, precision, and repeatability, the mounting carriage contacts the back plate at three points. Each point of contact is a ball bearing on the mounting carriage resting in the groove formed by two parallel steel pins. Since the axes defined by the three sets of pins share a common point of intersection, the system is properly constrained (kinematic). The mounting carriage can be easily inserted or removed from the fully assembled cage system by separating it from the back plate, rotating it sideways, and then extracting it from the cage.
The internal SM1 threading allows components up to 0.20" (5.1 mm) thick to be secured in the mounting carriage with the included SM1RR retaining ring. Components with external SM1 threading, like the SM1A7 alignment guide, can be threaded onto the mounting carriage. However, components mounted in this way (OD = 1.2" (30 mm)) cannot extend more than 3/16" (4.7 mm) beyond the face of the mounting carriage without sacrificing the ability to remove the mounting carriage and component from a closed cage system. The lateral repeatability specification (10 µm) indicates that the X, Y, and Z position of the mount will not vary by more than 10 µm after being removed and replaced, while the 1 µrad angular repeatability refers to the rotation of the optic not changing by more than 1 µrad.
Both the CP90F and CP90F-B cage rod through holes have side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key.
The LCP02(/M) cage plate provides a convenient means for coupling 30 mm and 60 mm cage assemblies via our Ø6 mm ER Cage Rods. The centered SM1 (1.035"-40) tapped hole directly accepts optics up to 0.35" (9 mm) thick (SM1RR retaining rings sold separately). Each cage rod through hole is accompanied by a side-located locking 4-40 setscrew, which can be secured using a 0.05" hex key. The LCP02(/M) also has an 8-32 (M4) tapped hole for Ø1/2" post mounting. The surface with the 8-32 (M4) tap is not wide enough to support Ø1" posts.
Additionally, two of these cage plates can be used to straddle a 30 mm cage subassembly in such a way that the entire assembly [LCP02(/M), 30 mm subsystem, and LCP02(/M)] can slide along the 60 mm cage rods as a single optomechanical unit. A 16 mm cage assembly can also be easily integrated by utilizing the SP05 cage plate adapter (sold above).
The C4W offers four planar cube faces with 4-40 tapped holes for mounting cage system rods centered on an SM1 (1.035"-40) threaded hole. The "top" and "bottom" faces of the cube are machined with Ø1.75" (44.5 mm) holes and tapped holes designed for mounting our Cage Cube Plates (featured below).
The C6W offers the same machined face options as the C4W with the exception of two opposing faces machined with Ø6 mm through-holes rather than 4-40 tapped holes. This allows cage rods to pass through the cube, rather than be fastened to it. This unique feature allows the cube to be translated along the cage rods, and then locked in place with the included setscrews.
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BS127CAM Beamsplitter Cube Adapter Mounted in the CM1-4ER Cage Cube (Optic and Adapter Sold Separately)
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CM1-4ER with Penta Prism (Optic Sold Separately)
These 1.5" wide cage cubes directly accept a 1" square optic, such as a beamsplitter cube or right-angle prism, with adapters available here for mounting a 5 mm (0.20"), 10 mm (0.39"), 12.7 mm (0.50"), or 20 mm (0.79") beamsplitter cube. The base of the cube has an 8-32 (M4) tap to attach to Ø1/2" Posts. Shown to the far right is a 12.7 mm (0.50") beamsplitter cube being mounted in the CM1-4ER using the BS127CAM Beamsplitter Cube Adapter. Two cage cubes can be connected using ER rods and ERSCA Cage Rod Adapters.
The optic is clamped within the cube by tightening three hex screws of a tension plate (see image above), allowing the user to replace the optic with any other compatible optic when necessary. The optic must sit flush against the three corners of the cube base. Do not over tighten the tension plate, this can damage the optic. The image above shows a penta prism mounted in a CM1-4ER with the outer housing removed.
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A C4W and C6W Cage Cube connected to a 1.5" wide CM1-4ER Compact Cage Cube using the C4W-CC and CM1-CC Cube Connectors, respectively.
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C4W-CC Connecting Two 2" Wide Cage Cubes
The C4W-CC allows our 2" wide 30 mm cage cubes to be connected together as shown in the image to the right. Our C4W and C6W cubes are both compatible with this connector. This connector can also be used to connect one 2" wide 30 mm cage cube, such as our C4W or C6W, with a 1.5" wide 30 mm cage cube.