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Fixed Compact Platform Mounts
V-Groove and Prism Clamp System
PCM Post Clamp and PCMV/PCMP Base Adapters Sold Separately
GRIN Fiber Collimator Mounted Using the PCM Post Clamp and PCMV V-Groove Base
Mounts 1" Beamsplitters or Right-Angle Prisms
Mounts 2" Beamsplitters or Right-Angle Prisms
Mounts 10 mm Beamsplitters or
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Right-Angle Prism Mounted Using the BSH1 Prism Mount
Thorlabs offers compact platform mounts for prisms, beamsplitter cubes, and cylindrical objects. Our BSH platform mounts are compatible beamsplitter cubes, right-angle prisms, and prism mirrors and feature a bottom-located tap for post mounting. For additional mounting options, the BSH1(/M) and the BSH2(/M) feature two counterbores for mounting directly to a breadboard. The PCM Clamp for Ø1/2" posts is used in conjunction with either the PCMP Flat Base for prisms or the PCMV V-Groove Base for cylindrical objects.
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View Metric Product List
BSH1 Platform Used to Mount 1" Beamsplitter Cube to a Breadboard
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Each mount except the BSH10(/M) is engraved with an area for labeling and the item # for easy identification.
Thorlabs' Prism Platform Mounts are designed to hold polarizing and non-polarizing beamsplitter cubes as well as with right-angle prisms and prism mirrors. The BSH10(/M) mount features a flexure clamping mechanism that accepts 10 mm +0.0 mm / -0.2 mm cubes and 10 mm ± 0.1 mm right angle prisms. The BSH20(/M), BSH1, and BSH2 accept 20 mm, 1”, or 2” cubes or right-angle prisms, respectively. They feature a side-mounted clamping mechanism that uses rare-earth magnets and dowel pins for opening and alignment. Both types of clamping mechanisms can be actuated using a 5/64" (2.0 mm) hex key.
The BSH10(/M), has a 4-40 (M3) tap for compatibility with our Mini-Series Posts and our Ø12 mm Pedestal Posts with 4-40 (M3) Setscrews. A torque hole in the mount allows a 5/64" balldriver or hex key to pass through and provide extra leverage when tightening the BSH10(/M) to the top of a post.
The BSH20(/M), BSH1(/M), and BSH2(/M) offer an 8-32 (M4) tap for compatibility with our Ø1/2" or Ø1" posts with 8-32 (M4) studs. The BSH1(/M) and BSH2(/M) feature two #8 (M4) or 1/4" (M6) counterbores, respectively, for mounting to an optical table or breadboard. The BSH1(/M) is directly compatible with our Mini-Series breadboards with 8-32 (M4) tapped holes. The AE8E25E (AE4M6M) thread adapter allows the BSH1(/M) to be mounted onto breadboards that have 1/4"-20 (M6) tapped holes. The BSH2(/M) is directly compatible with both our Mini-Series and standard breadboards with 1/4"-20 (M6) tapped holes. Either platform mount can also be mounted using two optical posts to align the prism's optical axis over the breadboard taps.
Please note: To reduce the risk of damage and stress-induced birefringance, we recommend applying as little force as possible when mounting the prism. To help provide guidance on the amount of torque needed, a UV Fused Silica right-angle prism and N-BK7 beamsplitter cube were both tested. For the BSH10, we would not recommend exceeding a mounting torque of 1 lb-in (0.11 N•m) for right-angle prisms or 2.5 lb-in (0.28 N•m) for beamsplitter cubes. For the larger mounts, we would not recommend exceeding a mounting torque of 1.5 lb-in (0.17 N•m) for right-angle prisms or 5.0 lb-in (0.56 N•m) for beamsplitter cubes. We recommend using the TD24 Torque Driver with a 5/64" (2.0 mm) hex driver bit.
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Thorlabs' Compact V-Groove and Platform Mount is ideal for mounting prisms up to 0.82" (20.8 mm) tall or cylindrical objects from 0.02" (0.6 mm) to 0.52" (13.2 mm) in diameter onto a Ø1/2" Optical Post. Its thin 0.65" (16.5 mm) profile allows the mount to easily fit into a space-constrained setup, where a larger mount, such as the KM100B Kinematic Platform Mount, could not. Please note that a complete post clamp mount will require a PCM(/M) Ø1/2" Post Clamp and either a PCMP(/M) Flat or PCMV(/M) V-Groove Base Adapter, all of which are sold separately.
The PCMP(/M) and PCMV(/M) Base Adapters thread onto the 1/4"-20 (M6) end of a Ø1/2" post to provide a stable mounting surface for prisms or cylindrical objects, respectively. To secure the mounted component, the PCM(/M) Post Clamp fits over the post and includes a PM3 or PM3/M Clamping Arm with nylon-tipped setscrew that can be adjusted using a 5/64" (2 mm) hex key. The post clamp is locked in place on the Ø1/2" post using a side-located thumbscrew that can also be secured using a 3/16" (5 mm) hex key. See the photo to the right for a mounting example.