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Right-Angle Beamsplitter Mounts for 30 mm Cage Systems


  • Split a Beam at 90° with Ø1" Beamsplitters or Dichroic Mirrors
  • Available with Kinematic Tip/Tilt or Rotation
  • 30 mm Cage System Compatible

C45P

Kinematic Mount
±1° Tip and Tilt Adjustment

Application Idea

Split a beam at 90° using the C45P Right-Angle Kinematic Cage Mount and create a perpendicular arm with the CP30 Right-Angle Cage Adapter.

C45M1

Nested Rotation Mount
360° Optic Cell Rotation

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Features

  • Mount Ø1" Optics at a 45° Angle to the Cage System's Optical Axis
  • Kinematic Mount for Tip and Tilt Adjustment
  • Rotation Mount with Nested Optic Cell for 360° Adjustment
  • 30 mm Cage System Compatibility

These Right-Angle Beamsplitter Cage Mounts secure a Ø1" optic within a 30 mm cage system at a 45° angle to the optical axis. Both mounts have two through holes at 90° for perpendicular transmitted beams. The C45P mount incorporates a flexure mechanism that provides ±1° of kinematic pitch and yaw adjustment. The C45M1 incorporates a nested optic cell that provides 360° of rotation adjustment.

The C45P is ideal for mounting transmissive optics like beamsplitters and beam samplers. The kinematic pitch and yaw adjustment can direct the reflected or transmitted beam to center the beam in a cage system or direct the beam to a specific target. The C45P secures the optic with a 5/64" (2.0 mm) nylon-tipped setscrew and features two 6.0 mm through holes with locking setscrews for cage rods to pass through.

The C45M1 can be used to rotate optics mounted at 45° in a cage system. The mount rotates in the 45° plane. The rotation mount can be used to mount wedged compensation plates to correct for angular deviation in the beam introduced by wedged optics upstream. The C45M1 can also rotate polarizing plate beamsplitters to align the reflected and transmitted polarization states relative to the cage system. The SM1-threaded, nested optic cell is removable to allow for quick optic changes, and the flexure locks allow the mount to snap into existing cage systems.


Posted Comments:
sasha  (posted 2018-08-30 05:43:01.4)
We found a problem when using C45P mirror mount if we want to move its position along cage rods. Each position change requires to make a new angular adjustment. Do you have any ideas for how to improve the "stability" of the C45P within a cage system ?
llamb  (posted 2018-09-17 06:08:42.0)
Thank you for your feedback. While not designed so much as a translation stage, the C45P should hold its kinematic position as the adjustment screws will not move. There may be a few sources affecting this consistency however, such as varying locking of the mount on the cage rods. I have reached out to you directly to troubleshoot further.

Right-Angle Kinematic Beamsplitter Mount

C45P and CPX1 Used for Beam Centering
Click to Enlarge
View Imperial Product List
Item #QtyDescription
C45P1Right-Angle Kinematic Mount for Ø1" Optics, 30 mm Cage Compatible
CPX1130 mm Translating Cage Segment Plate, 8-32 Tap
CP30130 mm to 30 mm Cage System Right-Angle Adapter
CP023SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
BSW101Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 400 - 700 nm, t = 5 mm
ER3-P42Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
View Metric Product List
Item #QtyDescription
C45P1Right-Angle Kinematic Mount for Ø1" Optics, 30 mm Cage Compatible
CPX1/M130 mm Translating Cage Segment Plate, M4 Tap
CP30130 mm to 30 mm Cage System Right-Angle Adapter
CP02/M3SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
BSW101Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 400 - 700 nm, t = 5 mm
ER3-P42Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
In this 90° cage system setup, the incoming beam enters from the left side. The beam transmitted by the beamsplitter in the C45P mount undergoes an offset. This is corrected for by the CPX1(/M) Translating Cage Segment Plate.
C45P Mount Features
Click to Enlarge

All Setscrews Have 5/64" (2.0 mm) Hex
  • Mount Ø1" Optics at a 45° Angle to the Cage System's Optical Axis
  • Kinematic Mount with Flexure Design for ±1° Tip and Tilt Adjustment
  • 30 mm Cage System Compatibility with Two Ø6.0 mm Through Bores
  • Maximum Clear Aperture for Beamsplitting: Ø0.58" (14.8 mm)
  • All Setscrews Feature a 5/64" (2.0 mm) Hex
Beam Deviation Due to Parallel Optic at 45°
Click to Enlarge

Beam Deviation Due to Parallel Optic at 45°

Thorlabs' C45P Right-Angle Flexure Mount secures a Ø1" optic within a 30 mm cage system at a 45° angle to the optical axis. The mount incorporates a flexure mechanism that provides ±1° of kinematic pitch and yaw adjustment to correct for small angular offsets in the reflected beam, such as those created by the 30 arcmin wedge in some plate beamsplitters. The pitch and yaw axes are actuated using two adjustment screws that are shown in the image to the right. Note: the kinematic adjustment screws should not be overdriven past the ±1° hard stops. Doing so may severely damage the flexure mechanism.

A nylon-tipped setscrew is used to secure the optic in the mount's double-bored hole. The minimum thickness for optics that can be secured by these mounts is 0.12" (3.0 mm). An optic spacer is necessary to mount optics thinner than 0.12" (3.0 mm). The screws for optic retention, kinematic adjustment, and cage rod locking can all be actuated using a 5/64" (2.0 mm) hex key or balldriver (sold separately).

Transmissive optics like beamsplitters and beam samplers will refract the transmitted beam as illustrated in the diagram to the left. A CPX1(/M) Translating Cage Segment Plate can be used in conjunction with the C45P to compensate for the offset of the beam as shown in the image to the far right.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
C45P Support Documentation
C45PRight-Angle Kinematic Mount for Ø1" Optics, 30 mm Cage Compatible
$159.65
Lead Time

Right-Angle Nested Rotation Beamsplitter Mount

C45M1 Correcting for Wedge Angle
Click for Details
View Imperial Product List
Item #QtyDescription
CPX1130 mm Translating Cage Segment Plate, 8-32 Tap
C45P1Right-Angle Kinematic Mount for Ø1" Optics, 30 mm Cage Compatible
C45M11Right-Angle Nested Rotation Mount for Ø1" Optics, 30 mm Cage Compatible
CP30130 mm to 30 mm Cage System Right-Angle Adapter
BSW101Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 400 - 700 nm, t = 5 mm
BCP43101Ø1" UVFS Beamsplitter Compensation Plate, 45° AOI AR Coating: 400 - 700 nm, t = 5 mm
CP021SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
ER3-P42Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
View Metric Product List
Item #QtyDescription
CPX1/M130 mm Translating Cage Segment Plate, M4 Tap
C45P1Right-Angle Kinematic Mount for Ø1" Optics, 30 mm Cage Compatible
C45M11Right-Angle Nested Rotation Mount for Ø1" Optics, 30 mm Cage Compatible
CP30130 mm to 30 mm Cage System Right-Angle Adapter
BSW101Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 400 - 700 nm, t = 5 mm
BCP43101Ø1" UVFS Beamsplitter Compensation Plate, 45° AOI AR Coating: 400 - 700 nm, t = 5 mm
CP02/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
ER3-P42Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
In this 90° cage system setup, the incoming beam enters from the left side. The beam transmitted by the wedged beamsplitter in the C45P mount undergoes a lateral offset and an angular deviation. The angular deviation is corrected for by the rotation of the compensation plate in the C45M1. The CPX1(/M) Translating Cage Segment Plate compensates for the offset.
C45P Mount Features
Click to Enlarge

All Setscrews Have 5/64" (2.0 mm) Hex
  • Rotate Ø1" Optics at 45° in a Cage System
  • Nested Optic Mount Allows Quick Optic Changes
  • Mount Optics up to 0.20" (5 mm) Thick
  • Flexure Lock Securely Clamps to Cage Rods
  • Maximum Clear Aperture for Beamsplitting: Ø0.44" (11.2 mm)
  • All Setscrews Feature a 5/64" (2.0 mm) Hex

Thorlabs' C45M1 Right-Angle Nested Rotation Mount secures a Ø1" optic within a 30 mm cage system at a 45° angle to the optical axis. The rotating optic cell allows for 360° of rotation to correct for angular offsets in the transmitted beam, such as those created by the 30 arcmin wedge in some plate beamsplitters.

An included SM1RR retaining ring is used to secure the optic in the mount's threaded hole. The maximum thickness for optics that can be secured by these mounts is 0.20" (5.0 mm). The flexure locks allow the mount to be slipped into an existing cage system and snapped into place. Note that the optic cell must be removed before inserting the mount into a cage system. The optic cell can be secured in the mount after the mount has been locked to the cage rods. The screws for locking the optic cell and the cage rods can all be actuated using a 5/64" (2.0 mm) hex key or balldriver (sold separately).

Most Thorlabs beamsplitters feature a 30 arcmin wedge to minimize ghosting effects. This wedge causes the transmitted light to exit the beamsplitter along a path that is not parallel to the cage system axis as shown in the diagram to the right. The rotating optic cell in the C45M1 allows the angle created by the wedge to be controlled and redirected. To compensate for the angle introduced by a wedged optic, we recommend using the C45M1 with a beamsplitter compensation plate in conjunction with a C45P, sold above. The C45M1 should be placed immediately downstream of the C45P as shown in the image above. The C45M1 can be rotated to redirect the beam to be parallel with the cage axis. The CPX1(/M) Translating Cage Segment Plate can then be used to recenter the cage system around the beam, which will have experienced a lateral offset caused by the thickness of the optics.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
C45M1 Support Documentation
C45M1Right-Angle Nested Rotation Mount for Ø1" Optics, 30 mm Cage Compatible
$77.25
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