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SM1-Compatible Manual Rotation Mounts
Internal SM05 Threads External SM1 Threads
Rotation Mount for Ø1" Optics and Two SM1 Lens Tubes
High-Precision Rotation Mount for Ø1" Optics
Cage System Rotation Mount for Ø1" Optics
High-Precision Rotation Platform
This page is a compilation of all of the SM1 (1.035"-40) threaded manual rotation mounts. Thorlabs also has similar compilations of SM threaded rotation mounts for Ø1/2" (12.7 mm) and Ø2" (50 mm) optics. If SM threading is not a primary requirement for the rotation mount, please see our complete line of manual and motorized rotation mounts.
The PRM1(/M) high-precision rotation mount for Ø1" optics combines 360° of continuous manual rotation with precise, backlash-free micrometer adjustment. The SM1 (1.035"-40) threaded inner bore accepts Ø1" optics up to 0.50" (12.7 mm) thick as well as any of our SM1-threaded components. Optics are secured with one SM1RR retaining ring, which is included with each mount.
The rotation dial face features a laser-engraved scale marked at 1° increments and can be rotated manually using the knurled outer surface (see drawing to the right). The thumbscrew, located on the lower right side of the mount, locks the dial face and engages the micrometer for fine adjustment. When locked, the micrometer provides ±7° of rotation at approximately 2.4 arcmin per micrometer division.
The PRM1(/M) is ideal for mounting either our SM1PM10 or SM1PM15 Polarizing Prism Mounts, both of which feature compatible SM1 threading. It can be purchased bundled with our SM1PM10 (Item# PRM1GL10 (PRM1GL10/M)). Together they provide 360° of high precision rotation for either our 10 mm Glan-Laser or Glan-Taylor Polarizer (sold separately).
The PRM1(/M) is also compatible with our 30 mm cage system. The cage system can be mounted to the unit using ER cage assembly rods attached to the four 4-40 tapped holes located on the rotation dial face (there are no 4-40 tapped holes on the back of the mount). When using this product the entire 30 mm cage system will be rotated, not just the optic. Pairing this with our CPR1 Rotating Cage Plate will allow for a rotating cage segment between the PRM1 and a fixed cage system.
The RSP1(/M) Continuous Rotation Mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.47" (11.9 mm) thick. Secure the optic with the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.
This mount has a knurled edge for adjusting rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.
The RSP1C(/M) Continuous Rotation Mount offers the same features as the RSP1 featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP1 above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.51" (12.8 mm) thick. Secure the optic's position using the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.
This mount has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. Unlike the RSP1 featured above, the front dial scale can be unlocked and rotated so that the scale can be aligned to the axis of an optic (e.g., fast axis of a wave plate) for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.
This animation shows the movable scale of the RSP1X15 being rotated to align with the fast axis of a wave plate; it also shows the engagement of the indexing mechanism.
The RSP1X15(/M) and RSP1X225(/M) rotation mounts for Ø1" optics feature both continuous 360° rotation and stepped rotation in increments of 15° for the RSP1X15(/M) or 22.5° for the RSP1X225(/M). The top of each mount has a setscrew that, when loosened with a 5/64" (2.0 mm) hex key or balldriver, allows for smooth, continuous, 360° rotation. Tightening the setscrew engages a detent mechanism that forces the mount to rotate in discrete increments. The mounted optic is retained in the central SM1-threaded (1.035"-40) bore using the included SM1RR retaining ring.
In addition, the engraved scale can be unlocked and rotated independently of the optic so that the markings can be aligned with respect to the mounted optic. For example, the zero of the engraved scale can be aligned with the fast axis of a wave plate or the polarization axis of a linear polarizer. To help with the alignment, an engraved arrow extends the zero mark all the way to the outside edge of the SM1-threaded bore used to mount the optic. This animation to the right details the operation of the RSP1X15.
This animation shows the CLR1 being installed in an SM1 lens tube setup. The wave plate installed in the CLR1 rotates, while the lens tubes remain stationary.
The CLR1(/M) is a rotation mount designed for use with Ø1" round cylindrical lenses and other rotationally sensitive optics within a lens tube system. As round cylindrical lenses only focus or expand light in one dimension, they are not easily aligned within a standard lens mount or lens tube. This rotation mount can be sandwiched between two lens tubes to provide rotation of the mounted optic without disturbing the attached lens tubes.
The back side of this mount utilizes an SM1 (1.035"-40) quick release adapter, which allows the mount to be quickly disconnected and reconnected to a lens tube setup. Please note that this adapter must be removed while inserting an optic in the mount, but once the optic is mounted, the adapter can be reattached. A convenient top-located setscrew can be tightened with a 0.05" (1.3 mm) hex key or balldriver to secure the rotational position of the mount.
The LM1-A is an SM1 threaded mounting carriage for Ø1" (Ø25 mm) optics that can be nested inside of an LM1-B (LM1-B/M) post mountable ring. The engraved angular scale on the outside edge of the LM1-A mounting carriage makes it easy to orient the carriage inside of the mounting ring.
The CRM05 Ø1/2" Rotation Mount is designed with an external SM1 thread (1.035"-40), allowing the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 0.26" (6.5 mm) thick. Optics are held in the mount with a SM05RR retaining ring (one included). Two notches along the mount’s circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place. The knurled edge of the CRM05 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount’s perimeter, ensuring there is always a witness line in a convenient and easily readable position. Tighten the 2-56 setscrew to lock the mount into position, preventing further rotation.
The CRM1 (CRM1/M) is designed to mount Ø1" (Ø25 mm) optics up to 10 mm thick in an SM1 threaded rotation carriage. The optic is secured using the included SM1RR retaining ring (the SPW602 spanner wrench is ideal for tightening this retaining ring). For thicker optics, any of our SM1 series of lens tubes can be threaded into the carriage or the CRM1L can be used instead. The smooth rotation mechanism allows for precise positioning of the rotation carriage. The CRM1(/M) is designed to be mounted in a 30 mm cage structure.
This animation shows the manual rotation and micrometer engagement of the CRM1P.
The CRM1P(/M) is designed to mount Ø1" (Ø25.4 mm) optics up to 9.4 mm thick in an SM1 threaded rotation carriage. The optic is secured using the included SM1RR retaining ring (the SPW602 spanner wrench is ideal for tightening this retaining ring). For thicker optics, any of our SM1 series of lens tubes can be threaded into the carriage. The smooth rotation mechanism on the CRM1P(/M) can be manually rotated to any position. When the rotation carriage is locked, the high-precision, backlash-free micrometer can then be used to fine tune the position of the rotation carriage over a range ±7°. The animation to the right illustrates how the CRM1P(/M) is used. The Vernier scale provides a resolution of 5 arcmin between consecutive marks. As the mount is rotated across the entire Vernier scale, there is a cumulative error of up to ±12.28 arcmin. The CRM1P(/M) is compatible with the 30 mm cage system and the 8-32 (M4) tapped mounting hole allows the rotation mount to be secured on a TR series post.
This mount is also mechanically compatible with Ø25.0 mm optics, but we only recommend this for applications in which the centration of the optics is not critical.
The PR01(/M) Precision Rotation Platform combines easy-to-use manual rotation with high-precision, backlash-free micrometer adjustment. While the platform dial is in an unlocked state, continuous smooth rotation can be measured using the 1º graduation marks. When locked via the steel thumbscrew (visible in image above), the dial is adjusted by a ±5º micrometer drive system, offering 5 arcmin resolution from the side vernier. For even higher angular resolution, the vernier can be used to calibrate the micrometer head graduations to as low as 1 arcmin across a ±5º range with an accuracy of better than 1%. The PR01(/M) has a load capacity of 25 pounds.
The SM1 (1.035"-40) tapped hole provides a Ø0.94" (24 mm) clear aperture at the base and 0.75" (19 mm) of usable thread. An array of 1/4"-20 (M6), #6-32 (M4), and #4-40 tapped holes offer a range of mounting options. While the 1/4"-20 (M6) tapped holes are for general purpose mounting, the #6-32 (M4) tapped holes provide compatibility with our PM1/PM2 series of clamping arms for applications including prism mounting. The #4-40 tapped holes are spaced for direct compatibility with our 30 mm Cage System rod spacing.
For optomechanical applications requiring a solid center rather than the SM1 tapped hole, the PR01A adapter plate is available.
Four 1/4" (M6) clearance slots are spaced for direct fastening to an optical table. An additional 1/4"-20 (M6) tapped hole on the edge opposite the micrometer drive allows for vertical mounting.
The XYR1(/M) is a low profile XY axis translation stage with continuous rotation about the Z axis. The central SM1-threaded through-hole allows the stage to be used in an imaging application that requires illumination from underneath the sample. The stage contains an array of 1/4"-20 (M6) and 8-32 (M4) tapped holes for mounting samples and components. In addition, the stage has eight 4-40 tapped holes around the central through-hole so that it can be used with Thorlabs' 30 mm or 60 mm cage system without the use of adapters.
The X and Y axis micrometers on the translation stage have a travel range of 1/2" (13 mm). An engraved angular scale along the outer edge of the stage's mounting surface allows the user to set the angular orientation of the stage, which can then be fixed using a locking setscrew. Locking the rotation axis does not prevent translation along the X and Y axes. To prevent attached components from interfering with the stage’s rotation or translation, the top surface of the rotation platform is above the frame of the XYR1(/M).
This stage is also compatible with Microscope Slide Spring Clips. The XYR1(/M) has 3 alignment holes for the Ø1/8" × 1/4" dowel pins (included with the SLH1). These dowel pins center the middle of a 1" × 3" microscope slide over the through hole, as well as allow the user to repeatedly and accurately position the slides on the stage. The spring clips include two 8-32 (M4) threaded shoulder screws with a 3/32" (2.5 mm) hex socket for simple attachment to the stage.