SM1 Compatible Rotation Mounts
This page is a compilation of all of the SM1(1.035"-40) threaded rotation mounts. Thorlabs also has a 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.
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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" (12 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 to lock the rotation of the mount.
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.
This animation details the operation of the RSP1X15.
The RSP1X15 rotation mount features both continuous 360° rotation and 15° stepped rotation for Ø1" optics. The optic is retained in the central SM1-threaded (1.035"-40) bore using the included SM1RR retaining ring. The top of the mount has a setscrew that, when loosened, allows for smooth, continuous, 360° rotation. Tightening the setscrew engages a detent mechanism that forces the mount to rotate in discrete 15° increments. 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. The animation to the right shows the moveable 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 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(/M) below). 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 XYR1 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.
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.
The PR01 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 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.
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 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 put 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 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 is designed to be mounted in a 30 mm cage structure.
The PRM1Z8E (PRM1/MZ8E) bundles the PRM1Z8 (PRM1/MZ8) Motorized Rotation Mount with our TDC001 T-Cube DC Servo Motor Controller, an ideal companion for smooth, continuous motion that can be automated via the software interface. Older units will require a firmware upgrade before they can be used with the Z8 series motors. An upgrade is included with the latest APT software, which can be downloaded here. The bundle ships complete with a TPS001 universal power supply, which includes a location-specific adapter.
The PRM1Z8E (PRM1/MZ8E) are supplied with 19.6" (0.5 m) of cable. An 8 ft (2.5 m) extension cable (PAA632) is available separately.
The CRM05 Ø1/2" Rotation Mount is designed with an external SM1 thread (Ø1.035"-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 (Ø0.535"-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.
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The PRM1Z8 can be Post-Mounted in Multiple Configurations
The PRM1Z8 is a small, compact, motorized rotation mount and stage that accepts Ø1" optics and SM1-threaded components. Two SM1RR retaining rings are included to secure optical components in this aperture. Rotation is driven via a DC servo motor that provides 1 arcsecond of resolution over the entire 360° of rotation. The user can measure the angular displacement by using the Vernier dial in conjunction with the graduation marks that are marked on the rotating plate in 1° increments. The rotating platform features four 4-40 holes, four 8-32 (M4) holes and four 6-32 (M3) holes to allow for the addition of accessories.
The TDC001 DC Servo Controller is the ideal companion for achieving smooth, continuous motion that can be automated via the software interface. Older units will require a firmware upgrade before they can be used with the Z8 series motors. An upgrade is included with the latest APT software, which can be downloaded here. The PRM1Z8 is supplied with 19.6" (0.5 m) of cable for connecting to a controller and an 8 ft (2.5 m) extension cable (PAA632) is also available separately. The rotation stage/mount is equipped with a home limit switch to facilitate accurate automated rotation, ensuring absolute angular positioning and continuous rotation of the stage over multiple 360° cycles.
Normally the PRM1Z8 is mounted horizontally on a flat surface using the counter-bored 1/4"-20 (M6) holes in the main body. For complete flexibility, the stage/mount can be mounted vertically using the 8-32 (M4) threaded holes in various locations (as shown to the left). When in the vertical orientation, the reduced thickness of the stage is extremely beneficial for optical path applications where space is limited.
Ø6 mm ER cage rods for a 30 mm cage system can be attached to the rotating dial of the PRM1Z8 using the four, 4-40 tapped holes. To restrict rotation of a cage assembly to a specific segment of a cage system, we recommend using the PRM1Z8 in combination with a CPR1 rotating cage segment (shown in the video to the right).
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 rotating platform features several accessories. The central aperture has a standard SM1 internal thread, for compatibility with a range of optics. Four #4-40 holes are provided so that the PRM1Z8 can be incorporated into a cage system. Additional threaded mounting holes allow for the addition of accessories or post mounting.
The PRM1SP1 (PRM1SP1/M) accessory plate is fixed to the rotating top plate by two 6-32UNC (M3) bolts (supplied), allowing any of Thorlabs' standard 3 mm tongue & groove accessories (optic mounts, diode holders, fiber chucks etc) to be used. Using this plate, the total deck height becomes 1.1" (28 mm).
The PRM1SP3 base plate is similar to the PRM1SP2 described opposite, but delivers a total deck height of 2.26" (57.5 mm). If used together with the PRM1SP1 described above, the deck height is 2.43" (62.5 mm) and is compatibe with our range of 3-axis stages (NanoMax, MicroBlock, PiezoBlock and RollerBlock).
The PRM1SP2 base plate is used to provide a more stable installation solution, with a deck height of 1.15" (29 mm). If used together with the PRM1SP1 described above, the deck height is 1.32" (34 mm).
Please see the PRM1Z8 product page for more details.