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30 mm Cage-Compatible Beam-Turning Cubes
Cube Top Features Removable Mounting Bar for Installing Alternate Optic
DFM1-M01 Beam Turning Cube shown with Ø6 mm Cage Rods
Cube Top with Silver-Coated Right-Angle Mirror (Bottom not Shown)
Orient the right-angle mirror in the cube as illustrated to reflect the incident beam. The cube top is engraved with a similar diagram showing the intended beam path.
Click to Enlarge ERSCA Cage Rod Adapters are Used to Connect the
DFM1-E03 Turning Cube to a VBA05-780 Variable Beamsplitter Cube
Thorlabs' Beam-Turning Cubes provide the ability to quickly switch between transmissive and right-angle-deflected beam paths within a 30 mm Cage System. Each beam-turning cube consists of a kinematic top and base. Each base has four SM1-threaded (1.035"-40) ports surrounded by four 4-40 tapped holes for compatibility with 30 mm cage systems. Each matching top features a 25 mm x 25 mm right-angle mirror with one of four reflective coatings: protected silver, protected gold, or dielectric-coated over 400 - 750 nm or 750 - 1100 nm. For mirror specifications and graphs, please see the Specs and Graphs tabs, respectively.
Magnets in the base and top of the beam turning cube ensure repeatable positioning of the cube within a cage system. The ports are at an optical axis height of 1.25" and 30 mm for the imperial and metric versions, respectively. The top of each cube is engraved with a diagram of the mirror location and indicates the light path through the cube (please refer to the diagram to the right to determine how to orient the beam turning cube within your system).
Additional cube tops (sold separately below) can be used to exchange optics and to quickly switch between transmissive and left- or right-deflected beam paths. This is ideal for laser steering applications. The cube base is also separately available for purchase. The same base is used in Thorlabs' Fluorescence Filter Cube System, enabling a user to exchange right-angle mirrors/prisms and fluorescence filter sets within an aligned optical setup. Two adjacent kinematic cubes can be connnected using the Cage Cube Connector (sold separately below); the connector can be attached via the 4-40 tapped holes and unthreaded alignment holes surrounding each port.
Thorlabs' also offers empty cage cubes for installing user-provided right-angle mirrors.
The shaded regions in the graphs denote the ranges over which we guarantee the specified reflectance. Please note that the reflectance outside of these bands is typical and can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.
Protected Silver Coating (450 nm - 20 µm)
Protected Gold Coating (800 nm - 20 µm)
These plots show the reflectance of our -E02 (400 - 750 nm) and -E03 (750 - 1100 nm) dielectric coatings for a typical coating run. The shaded region in each graph denotes the spectral range over which the coating is highly reflective. Due to variations in each run, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective. If you have any concerns about the interpretation of this data, please contact Tech Support. For applications that require a mirror that bridges the spectral range between the dielectric coatings, please consider a metallic mirror.
-E02 Coating (400 - 750 nm)
Click for Details
Each beam turning cube includes an installed right-angle mirror. Remove the mounting bar using a 3/32" hex key (included) to replace the optic with a user-provided mirror.
These 30 mm Cage-Compatible Beam-Turning Cubes each consist of a post-mountable cube base and a removable top equipped with a right-angle mirror. The cube top is magnetically retained in the cube base, allowing for repeatable removal and insertion of optics in an aligned setup. Each top features a pre-mounted right-angle mirror for easy integration into Thorlabs' SM1 (1.035"-40) lens tube and 30 mm cage systems. For users that want to install their own optics, we offer empty 30 mm Cage Cubes for Right-Angle Mirrors.
Cube tops have two SM1-threaded ports to mount Ø1" optics (up to 5.0 mm thick) against the back lip (two SM1RR retaining rings included). The mounting bar for holding the right-angle mirror within the cage cube can be removed using the included 3/32" hex key (see the image to the right). These cube tops are right-turning; empty left-turning cube tops are available below to easily adjust the handedness of the laser direction. The ports are at an optical axis height of 1.25" and 30 mm for the imperial and metric versions, respectively.
All four sides of the turning cube base have an SM1-threaded port and four 4-40 tapped holes for compatibility with Ø6 mm cage rods. Each cube base has three bottom-located 1/4"-20 (M6) tapped holes that are directly compatible with top taps of our Ø1" and Ø1.5" posts, and the bottom tap of our Ø1/2" posts, using a user-supplied 1/4"-20 (M6) setscrew. Alternatively, a AE8E25E (AE4M6M) thread adapter can be used for compatibility with the top tap of our Ø1/2" posts.
Empty beam-turning cube tops, bottom, and a cover plate are also sold separately below.
Click to Enlarge
DFM1B base shown with CPS532 and no top (top), a DFM1T2 top with MRA25-P01 mirror (middle), and DFM1T4 top with the same mirror installed (bottom).
These Kinematic Beam-Turning Cube Tops (Item #'s DFM1T2 and DFM1T4) and Base (Item # DFM1B(/M)) are ideal for mounting and exchanging right-angle mirrors or prisms within an aligned experimental setup.
The DFM1T2 and DFM1T4 cube tops are designed to hold right-angle prisms or mirrors with sides measuring 25 mm x 25 mm. Two SM1-threaded ports on the cube tops are available to mount Ø1" optics (up to 5.0 mm thick) against the back lip (two SM1RR retaining rings included). The mounting bar for holding the right-angle mirror within the cage cube can be removed using the included 3/32" hex key. The DFM1T2 holds a right-angle mirror in a right-turning orientation, and the DFM1T4 in a left-turning orientation. Thus, replacing the DFM1T2 top with the DFM1T4 results in a 180° change in beam direction (see image to the right). These tops are compatible with the Beam-Turning Cubes sold above as well as Thorlabs' Fluorescence Filter Cube Systems.
Magnetic retention of a cube top within the base allows for repeatable removal and insertion of optics in an aligned setup. All four sides of the DFM1B turning cube base have an SM1-threaded port and four 4-40 tapped holes for compatibility with Ø6 mm cage rods. Each cube base has three bottom-located 1/4"-20 (M6) tapped holes that are directly compatible with top taps of our Ø1" and Ø1.5" posts, and the bottom tap of our Ø1/2" posts, using a user-supplied 1/4"-20 (M6) setscrew. Alternatively, a AE8E25E (AE4M6M) thread adapter can be used for compatibility with the top tap of our Ø1/2" posts.The ports on the cage cube base are at an optical axis height of 1.25" and 30 mm for the imperial and metric versions, respectively.
The DFM1C Cage Cube Cover is also available for users who need a top cover for when a turning mirror is not installed within the cube. When used with the SM1CP2 End Cap, this top cover reduces the amount of stray light entering through the top or unused ports.
Click to Enlarge
Two DFM1-P01 Beam Turning Cubes Connected Using the C4W-CC Cage Cube Connector
The C4W-CC Cage Cube Connector allows two kinematic beam turning or fluorescence filter cubes to be connected together as shown in the image to the right. Two pins on the C4W-CC are accepted by drilled holes on either side of any of the SM1-threaded (1.035"-40) ports on the cage cube faces to maintain alignment. Fluorescence filter and beam turning cubes can still be removed and inserted while the cube housings are connected.
The C4W-CC is also compatible with our 30 mm cage cubes.