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60 mm Cage Rotation Mounts
Rotating 30 mm Cage Assembly
Thorlabs offers two rotation mounts for integrating optics and mechanical assemblies with 60 mm cage systems. The LCRM2(/M) Rotation Mount is designed to provide 360° of continuous rotation for Ø2" (50.8 mm) optics. Alternatively, other optomechanical components can be mounted in the SM2-threaded (2.035"-40) rotation carriage to integrate other optic sizes and shapes with a 60 mm cage system, as shown in the photo above (see the Application tab for details). The LCP02R(/M) rotation mount provides fine rotation adjustment over a ±8° range for SM1-threaded components mounted in a 60 mm cage system.
LCRM2 - Creating a Rotating 30 mm Cage Assembly Within a 60 mm Cage System
Thorlabs' versatile cage system can be used to create complex optical systems with elements that are aligned along a common optical axis. The cage system is available in three different sizes (16 mm, 30 mm, and 60 mm rod spacings), with a wide selection of accessories available as well as cage size adapters that allow for interoperability of different cage sizes. Smaller cage assemblies may be mounted within larger ones where clearances allow, as in the Application Idea above.
Design & Construction
In the Application Idea above, a 30 mm cage assembly is mounted on a CP07T SM2-Threaded Round Cage Plate, which is threaded into an LCRM2 60 mm Cage Rotation Mount (available below). The 30 mm cage assembly consists of a TO-can laser diode and collimation optics. Rotating the laser diode in conjunction with its collimation optics allows the polarization axis of the TO can laser diode to be rotated while maintaining a collimated, approximately Gaussian beam.
The Ø9 mm TO can laser diode is mounted in an LDH9-P2 30 mm Cage Collimation Mount and SR9 ESD Protection/Strain Relief Cable. The collimated elliptical output of the laser diode is corrected for using cylindrical lenses mounted in CYCP Cylindrical Lens Mounts. ER1.5 Cage Assembly Rods must be substituted for the ER2 rods that are included with each CYCP mount. This provides the necessary clearance for the 30 mm cage assembly to rotate unobstructed within the 60 mm cage assembly.
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Rotating 30 mm Cage Assembly Within 60 mm Cage System
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.
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 below). The 16 mm cage, 30 mm cage, and 60 mm cage standards are designed to accomodate Ø1/2", Ø1", and Ø2" optics, respectively. Specialized cage plates that allow smaller optics to be directly inserted into our larger cage systems are also available.
The flexibility of our Cage Assembly System stems from well-defined mounting and thread standards designed to directly interface 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 industry's most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards.
An example of the standard cage plate measurements determining cage system compatibility.
Rotation Mount and Stage Selection Guide
Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.
Manual Rotation Mounts
Manual Rotation Stages
Motorized Rotation Mounts and Stages
The LCRM2(/M) Rotation Mount is designed to mount Ø2" (50.8 mm) optics up to 0.51" (13 mm) thick in an SM2-threaded (2.035"-40) rotation carriage. The optic is secured using the included SM2RR retaining ring (the SPW604 spanner wrench is ideal for tightening this retaining ring). For thicker optics, any of our SM2 series of lens tubes can be threaded into the carriage. The smooth rotation mechanism allows for precise positioning of the rotation carriage. The mount is compatible with the 60 mm cage system and can be mounted on a Ø1/2" optical post using the 8-32 (M4) tapped mounting hole on the bottom side of the rotation mount.
The LCRM2(/M) mount is also compatible with the CP07T SM2-Threaded Round Cage Plate which allows 30 mm cage assemblies to be used inside a 60 mm cage system. This is illustrated in the Application Idea above. For more details, please see the Application tab.
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The LCP02R allows for fine adjustment of optic rotation in 60 mm cage systems.
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Loosening all three setscrews along the edge of the front face allows the SM1-threaded rotation plate to be removed. It can be installed in reverse, which brings the SM1 threads flush with the front surface of the mount.
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The back plate of the LCP02R is 60 mm cage compatible and has an SM1-threaded bore.
Thorlabs' LCP02R(/M) 60 mm Cage System Rotation Mount with SM1 threads provides ±8° of rotation adjustment for SM1-threaded components integrated with 60 mm cage systems. Three setscrews around the edge of the front face can be loosened using a 1/16" (1.5 mm) hex key to allow manual 360° rotation. Once these screws are tightened, fine rotation adjustment is achieved via a threaded adjuster. A fine adjustment scale engraved on the side of the mount has graduations every 1° with a range of ±8°. For motorized adjustments, the manual adjuster can be replaced with a Z812 servo motor actuator that provides a total of 13° of fine rotation adjustment.
The back plate of the mount features four through holes for ER cage rods that are compatible with Thorlabs' 60 mm cage system. The front and back plates of the mount have 0.20" (5.1 mm) deep internal SM1 (1.035"-40) threads, allowing Ø1" lens tubes and other SM1-threaded components to be integrated with the rotation mount. Alternatively, Thorlabs USB C-mount cameras or Scientific Cameras can be attached to one of the SM1-threaded bores in the LCP20R rotation mount via the SM1A39 SM1 to C-Mount Adapter.
A side located setscrew that accepts a 0.050" hex key helps to prevent the rotation angle from being displaced by accidental contact. Two 1/4"-20 (M6) taps in the back plate allow the LCP02R to be post mounted.