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Item #	Qty	Description
BSH1	1	Platform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, 8-32 Tap
PBS254	1	1" Polarizing Beamsplitter Cube, 1200 - 1600 nm
AE8E25E	2	Adapter with Internal 8-32 Threads and External 1/4"-20 Threads, 0.38" Length
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Item #	Qty	Description
BSH1/M	1	Platform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, M4 Tap
PBS254	1	1" Polarizing Beamsplitter Cube, 1200 - 1600 nm
AE4M6M	2	Adapter with Internal M4 x 0.7 Threads and External M6 x 1.0 Threads, 10.0 mm Length
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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 for easy identification.

• Mount 10 mm, 1/2" (12.5 mm), 20 mm, 1" (25.0 mm), or 2" (50.0 mm) Beamsplitter Cubes and Right-Angle Prisms 
• Compact, Low-Profile Design with Secure Clamping
• Tapped for Post Mounting
• BSH1(/M) and BSH2(/M) Feature Counterbores for Breadboard Mounting

Thorlabs' Prism Platform Mounts are designed to hold polarizing and non-polarizing beamsplitter cubes as well as right-angle prisms and prism mirrors. The BSH10(/M) and BSH05(/M) mounts feature a flexure clamping mechanism, and accept 10 mm or 1/2" cubes or right-angle prisms, respectively. The BSH20(/M), BSH1(/M), and BSH2(/M) 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.  The BSH05(/M), 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 BSH10(/M) and BSH05(/M) have a torque hole on the side, which allows a 5/64" balldriver or hex key to pass through and provide extra leverage when tightening the mount to the top of a post.

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 and BSH05, 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.

• Amount of Optic Obscured by Mount

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Item #	Qty	Description
PCM	1	Post Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
PCMP	1	Flat Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
TR4	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
PH4	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
PS991	1	Dove Prism, A = 10 mm, N-BK7, Uncoated
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Item #	Qty	Description
PCM/M	1	Post Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
PCMP/M	1	Flat Base Adapter for PCM(/M) Mount, M6 Threaded Stud
TR100/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
PH100/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
PS991	1	Dove Prism, A = 10 mm, N-BK7, Uncoated
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PCM Clamp and PCMP Base Used to Mount a Prism

• Mount Prisms or Cylindrical Objects to 1/4"-20 (M6) End of our Ø1/2" Optical Posts
• PCM(/M) Ø1/2" Post Clamp Secures Objects Mounted on Base Adapters
• PCMP(/M) Flat Adapter Holds Prisms or Beamsplitter Cubes
  • Maximum Optic Height: 0.82" (20.8 mm)
• PCMV(/M) V-Groove Adapter Holds Cylindrical Objects
  • Minimum Object Diameter: 0.02" (0.6 mm)
  • Maximum Object Diameter: 0.52" (13.2 mm)

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.