Fixed Compact Platform Mounts


  • Mount Beamsplitter Cubes and Right-Angle Prisms
  • Mount Cylindrical Components to Ø1/2" Optical Posts

V-Groove and Prism Clamp System

PCM Post Clamp and PCMV/PCMP Base Adapters Sold Separately

Application Idea

GRIN Fiber Collimator Mounted Using the PCM Post Clamp and PCMV V-Groove Base

BSH1

Mounts 1" Beamsplitters or Right-Angle Prisms

 

BSH2

Mounts 2" Beamsplitters or Right-Angle Prisms

BSH10

Mounts 10 mm Beamsplitters or
Right-Angle Prisms

Related Items


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Click to Enlarge

Right-Angle Prism Mounted Using the BSH1 Prism Mount

Features

  • Five Prism Platform Mounts for Beamsplitter Cubes and Right-Angle Prisms
  • PCM Clamp with PCMP Flat Adapter Holds Prisms or Beamsplitter Cubes
    • Maximum Optic Height: 0.82" (20.8 mm)
  • PCM Clamp with PCMV V-Groove Adapter Holds Cylindrical Objects
    • Minimum Object Diameter: 0.02" (0.6 mm)
    • Maximum Object Diameter: 0.52" (13.2 mm)

Thorlabs offers compact platform mounts for prisms, beamsplitter cubes, and cylindrical objects. Our BSH platform mounts are compatible with beamsplitter cubesright-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.


Posted Comments:
Hee-Jin Lim  (posted 2022-08-09 13:42:23.93)
I am using this well with half inch cube polarizers. It would be more nicer if the proper torque range for a seizing screw is given in specifications. I have experienced several times that excessive torques had produced cracks in glass materials of polarizers. The torque range must be dependent on glass materials, and pressure on materials also depends on friction coefficient of threads. That may not be easy to quantify. Still, I would like to have small hints for starting values of torque.
cdolbashian  (posted 2022-08-15 03:24:10.0)
Thank you for reaching out to us with this inquiry. While we do not have a specific torque value measured for this, as we typically just recommend hand-tightening, I have reached out to you directly with a potential approach to solving this issue.
羿轩 李  (posted 2021-04-19 17:50:27.327)
The spacing of the two M4 screw holes above the BSH1/M is 25.4mm and cannot be mounted on the metric optical plate.
YLohia  (posted 2021-04-22 10:16:59.0)
Thank you for contacting Thorlabs. Since these are counterbored holes, there is enough slop when mounting capscrews to a 25 mm hole pattern breadboard/baseplate. This should still be useable in your application. I have contacted you directly about this.
user  (posted 2020-10-19 13:18:13.957)
Are these mounts (BSH1 or BSH 2) secure enough to hold a prism or beamsplitter cube sideways (e.g. mounted to a vertical breadboard)?
llamb  (posted 2020-10-20 03:28:40.0)
Thank you for contacting Thorlabs. While the BSH- series mounts can hold a prism/beamsplitter sideways, the setup will pose a greater risk for the optic, so it is not recommended. A user may feel inclined to apply extra torque on the BSH- mount's locking screw in order to hold the optic more securely against gravity's pull, which can lead to stress-induced birefringance or even damage.
baldwidp  (posted 2016-11-30 17:09:36.01)
Make a 2" version to hold a 2" beamsplitter cube.
tfrisch  (posted 2016-12-05 10:00:44.0)
Hello, thank you for contacting Thorlabs. I have posted this in our internal engineering forum.
user  (posted 2016-09-20 13:15:19.797)
Please make a version of the BSH1 that can hold 1/2 inch beamsplitters.
jlow  (posted 2016-09-21 04:50:32.0)
Response from Jeremy at Thorlabs: Thank you very much for your suggestions. We will look into making this as part of our stock item.
cbrideau  (posted 2015-10-22 14:03:41.803)
A version of this prism holder that replaces the front plate on a KMS kinematic mount would make for an excellent tip/tilt stage for the prism.
besembeson  (posted 2015-10-28 10:02:01.0)
Response from Bweh at Thorlabs USA: Thanks for the feedback. This could be good for a more compact version of the KM100B and KM100PM (http://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=1811) that are designed for such purposes. We will review this.

Platform Mounts for Beamsplitter Cubes and Right-Angle Prisms


Click to Enlarge

View Imperial Product List
Item #QtyDescription
BSH11Platform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, Imperial
PBS25411" Polarizing Beamsplitter Cube, 1200 - 1600 nm
AE8E25E2Adapter with Internal 8-32 Threads and External 1/4"-20 Threads, 0.38" Length
View Metric Product List
Item #QtyDescription
BSH1/M1Platform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, Metric
PBS25411" Polarizing Beamsplitter Cube, 1200 - 1600 nm
AE4M6M2Adapter with Internal M4 x 0.7 Threads and External M6 x 1.0 Threads, 10.0 mm Length

BSH1 Platform Used to Mount 1" Beamsplitter Cube to a Breadboard

Click to Enlarge

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 birefringence, 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.

Item # Compatible Optics Mounting Holes Clamping Lip Heighta Clamping Screw Hex
BSH10(/M) 10.0 mm Cubes and Right-Angle Prisms One 4-40 (M3) Tap 0.063" (1.6 mm) 5/64" (2.0 mm)
BSH05(/M) 0.50" or 12.5 mm Cubes and Right-Angle Prisms One 8-32 (M4) Tap 0.075" (1.9 mm)
BSH20(/M) 20.0 mm Cubes and Right-Angle Prisms One 8-32 (M4) Tap 0.075" (1.9 mm)
BSH1(/M) 1.00" or 25.0 mm Cubes and Right-Angle Prisms One 8-32 (M4) Tap
Two #8 (M4) Counterbores
0.075" (1.9 mm)
BSH2(/M) 2.00" or 50.0 mm Cubes and Right-Angle Prisms One 8-32 (M4) Tap
Two 1/4" (M6) Counterbores
0.1" (2.5 mm)
  • Amount of Optic Obscured by Mount
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
BSH10 Support Documentation
BSH10Platform Mount for 10 mm Beamsplitters and Right-Angle Prisms, 4-40 Tap
$43.50
Today
BSH05 Support Documentation
BSH05Platform Mount for 1/2" or 12.5 mm Beamsplitters and Right-Angle Prisms, 8-32 Tap
$48.93
Today
BSH20 Support Documentation
BSH20Platform Mount for 20 mm Beamsplitters and Right-Angle Prisms, 8-32 Tap
$65.24
7-10 Days
BSH1 Support Documentation
BSH1Platform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, Imperial
$51.02
Today
BSH2 Support Documentation
BSH2Platform Mount for 2" or 50.0 mm Beamsplitters and Right-Angle Prisms, Imperial
$70.68
Today
+1 Qty Docs Part Number - Metric Price Available
BSH10/M Support Documentation
BSH10/MPlatform Mount for 10 mm Beamsplitters and Right-Angle Prisms, M3 Tap
$43.50
Today
BSH05/M Support Documentation
BSH05/MPlatform Mount for 1/2" or 12.5 mm Beamsplitters and Right-Angle Prisms, M4 Tap
$48.93
Today
BSH20/M Support Documentation
BSH20/MPlatform Mount for 20 mm Beamsplitters and Right-Angle Prisms, M4 Tap
$65.24
Today
BSH1/M Support Documentation
BSH1/MPlatform Mount for 1" or 25.0 mm Beamsplitters and Right-Angle Prisms, Metric
$51.02
Today
BSH2/M Support Documentation
BSH2/MPlatform Mount for 2" or 50.0 mm Beamsplitters and Right-Angle Prisms, Metric
$70.68
Today

Compact V-Groove and Platform Mount for Prisms and Cylindrical Objects


Click to Enlarge

View Imperial Product List
Item #QtyDescription
PCM1Post Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
PCMP1Flat Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
PH41Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
PS9911Dove Prism, A = 10 mm, N-BK7, Uncoated
View Metric Product List
Item #QtyDescription
PCM/M1Post Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
PCMP/M1Flat Base Adapter for PCM(/M) Mount, M6 Threaded Stud
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
PH100/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
PS9911Dove Prism, A = 10 mm, N-BK7, Uncoated
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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PCM Support Documentation
PCMPost Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
$42.44
Today
PCMP Support Documentation
PCMPFlat Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
$18.19
Today
PCMV Support Documentation
PCMVV-Groove Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
$18.19
Today
+1 Qty Docs Part Number - Metric Price Available
PCM/M Support Documentation
PCM/MPost Clamp Mount for Ø1/2" (12.7 mm) Posts (Base Adapter Sold Separately)
$42.44
Today
PCMP/M Support Documentation
PCMP/MFlat Base Adapter for PCM(/M) Mount, M6 Threaded Stud
$18.19
Today
PCMV/M Support Documentation
PCMV/MV-Groove Base Adapter for PCM(/M) Mount, M6 Threaded Stud
$18.19
Today