30 mm Cage-Compatible Beam Turning Cubes
 The Turning Mirror is a right-angle prism with a front-surface coating on the hypotenuse and is designed to have the beam path as shown. Features- Prealigned, Removable Right-Angle Mirror in 30 mm Cage Cube
- 30 mm Cage and SM1 Lens Tube Compatible
- Compatible with Fluorescence Filter Cube Systems
- Easily Swap Between Transmission or Right-Angle Reflection Modes
- Includes One of Four Premounted Right-Angle Mirrors:
- Silver-Coated (MRA25-P01) Mirror
- Gold-Coated (MRA25-M01) Mirror
- Dielectric-Coated, 400 - 750 nm, (MRA25-E02) Mirror
- Dielectric-Coated, 750 - 1100 nm, (MRA25-E03) Mirror
Thorlabs' Beam Turning Cubes provide the ability to swap between transmissive and right-angle-deflected beam paths within a 30 mm Cage System. This cube is ideal for laser steering applications. Using the same innovative kinematic design as the Fluorescence Filter Cubes, the Beam Turning Cube consists of a base and top with insert. The top includes a pre-mounted right-angle mirror (see selection below). The top of each cube is engraved with a diagram of the mirror location and indicates the light path through the cube. The same base included in the Fluorescence Filter Cube is provided in the Beam Turning Cube, thereby enabling exchange between right-angle mirrors/prisms and fluorescence filter sets. The Beam Turning Cube is a 2.0" (50.8 mm) light-tight square cube that contains a pre-aligned, mounted optic for easy integration into Thorlabs' SM1 (1.035"-40) Lens Tube and 30 mm Cage Systems. All four sides have an SM1-threaded port for Ø1.0" (Ø25.4 mm) optics and four 4-40 tapped holes on 30.0 mm centers for compatibility with Thorlabs' Cage Systems. The Beam Turning Cube has a bottom-located 1/4"-20 (M6) tap that is directly compatible with our Ø1" and Ø1.5" mounting posts. The cubes can also be directy attached to our Ø1/2" posts using a user-supplied 1/4"-20 (M6) setscrew; alternately, an AE8E25E (AE4M6M) adapter can be used for compatibility with our Ø1/2" posts' 8-32 (M4) threaded studs. For details on all of the mounting features, please see the mechanical drawing above. The cube tops (DFMT2) and bases (DFMB and DFMB/M) are available separately. The DFMT2 tops are not provided with mirrors, which is ideal for customers who wish to mount their own turning mirror or other right angle prism into our cubes. Please note that the cube is designed to hold right-angle prisms with sides measuring 25 mm x 25 mm.
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| Item # | DFM(/M)-P01 | DFM(/M)-M01 | DFM(/M)-E02 | DFM(/M)-E03 |
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| Mirror Item # | MRA25-P01 | MRA25-M01 | MRA25-E02 | MRA25-E03 | | Hypotenuse Coating | Protected Silver | Protected Gold | Dielectric 400 - 750 nm | Dielectric 750 - 1100 nm | | Reflectivity | Ravg >97.5% (450 nm - 2 μm)
Ravg >96% (2 - 20 μm) | Ravg >96% (800 nm - 20 μm) | Refer to GraphsTab | Refer to Graphs Tab | | Substrate Material | BK7 | BK7 | BK7 | BK7 | | Dimensional Tolerance | ±0.1 mm | ±0.1 mm | ±0.1 mm | ±0.1 mm | Surface Quality
(Coated Surface) | 40-20 Scratch-Dig | 40-20 Scratch-Dig | 10-5 Scratch-Dig | 10-5 Scratch-Dig | Flatness
(Coated Surface) | λ/10 @ 632.8 nm
(70% of Face Length and Width) | λ/10 @ 632.8 nm
(70% of Face Length and Width) | λ/10 @ 632.8 nm
(70% of Face Length and Width) | λ/10 @ 632.8 nm
(70% of Face Length and Width) | | 45°-45°-90° Prism Angular Tolerance | ±3 arcmin | ±3 arcmin | ±3 arcmin | ±3 arcmin | | Damage Threshold | 3 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø1.000 mm | 2 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø1.000 mm | 0.25 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.803 mm | 1.0 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.133 mm
0.5 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.433 mm |
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All data shown below is for unpolarized light, unless otherwise stated. The shaded regions in the graphs denote the ranges over which we recommend using these optics. Protected Silver Coating (450 nm - 20 µm)Protected Gold Coating (800 nm - 20 µm)
These plots show the reflectivity 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)
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Additional Microscopy Optomechanics
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Cube-Mounted Kinematic Beam Turning Mirrors
