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Gimbal Mounts

  • Pure Rotational Motion About Center of Mirror Face
  • Hardened Steel Inserts for Durability and Stability


with Ø1" Optic
(Not Included)



Cage Assembly
Sold Separately

Cage Turret Mount
with Gimbal Motion

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  • Hardened Steel Inserts
  • Durable and Stable Design
  • Pure Rotation without Translation
  • Mirror Rotation Centered About (Post) Mounting Axis
  • Fabricated from Black Anodized Aluminum

Thorlabs offers a series of gimbal mounts that provide rotation without translation; in each case, rotation occurs about the center of optic's front surface. These mounts are designed to eliminate angular or positional crosstalk when steering a beam of light and utilize hardened steel inserts to reinforce all key wear points. The GMB1(/M) features fully lockable adjusters to maintain the desired optical alignment. The KC45D can also be locked down through the inclusion of our locking collars. These mounts feature the highly stable design consistent throughout our entire line of kinematic and gimbal mounts.

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Posted Comments:
Posted Date:2017-01-22 14:23:18.817
Is it possible to use gimbal mount replacing its manual actuators with two motorized ones? In order to use it as alternative to galvomirror? If yes what motorized actuator do you suggest?
Posted Date:2016-05-04 21:55:04.29
Although the GM100/M is presented as metric, the M4 tapped holes are 0.5in and 1in apart, and not 25mm! Can you make the M4 tapped holes 25mm apart? Thanks
Posted Date:2016-05-05 11:37:14.0
Response from Bweh at Thorlabs USA: We will review this drawing. You can contact me at for updates.
Posted Date:2016-04-08 04:21:51.93
when i control the pitch and yaw to get light alignment, if it doesn't working, what should i do?
Posted Date:2016-04-11 11:53:22.0
Response from Bweh at Thorlabs USA: I will contact you to further discuss your application.
Posted Date:2013-07-25 15:47:36.893
You really need to make a GMB1S serie for square optics, built with extreme low tolerance on the horizontal alignment (fixed roll at 0°). Everytime you sell a $70 grating, Newport sells a $300 gimball mount, just because your KGM serie is so not convincing: they lack the roll axis and can't even be placed on the rotation axes of the GMB1, or any KMxxx.
Posted Date:2013-07-25 18:45:00.0
Response from Chris at Thorlabs: Thank you for your feedback. I have begun an internal discussion with our engineers regarding your request. We are currently in the final stages of designing a gimbal prism mount and I believe we may be able, with some redesign, offer this as a grating solution as well.
Posted Date:2013-03-08 18:03:55.66
What is the angle per revolution for the GM100/M? The pdf cad drawing says 0.035deg/rev, while for the GM100 it says 0.35deg/rev. On my GM100/M I am seeing about 75% of the 0.35 value, so about 0.26deg/rev. What is it supposed to be and how much variation can I expect to see from the spec across the adjustment range? thanks!
Posted Date:2013-03-14 14:41:00.0
Response from Jeremy at Thorlabs: It seems that we made a mistake on the drawing for this. Please note that the angular displacement per revolution of the knob is not linear. I will e-mail you the angular displacement data for a GM100 we have on hand. Thank you for letting us know about this. We will be updating the web drawings shortly.
Posted Date:2013-02-18 08:16:20.493
How does the Gimbal mount compare to the Polaris mount with respect to long term stability and angular positioning performance?
Posted Date:2013-02-27 15:50:00.0
Response from Chris at Thorlabs: Unfortunately we do not have any data directly comparing the gimbal points to the Polaris line. My sense is that the Polaris mounts are more thermally stable as this is one of the main reasons behind the design. i will contact you directly to discuss this further.
Posted Date:2012-04-19 15:41:00.0
Response from Tim at Thorlabs: Thank you for your feedback. The point of rotation for both axes is located at the center of the mounted optic’s surface. This does not have translational movement, but pitch and yaw. I will contact you with more information.
Posted Date:2012-04-18 23:14:43.0
Where is the gimbal axes located within this mount? Obviously the center of the aperture for x and y, but z is not obvious.
Posted Date:2011-07-14 13:17:00.0
Response from Javier at Thorlabs to avle: The purpose of the two setscrews located at the top and bottom of the GM100 is not for locking the rotation of the mount. They are used to secure the back plate of the mount in place while the front plate rotates through the two gimbal axes.
Posted Date:2011-07-13 17:47:01.0
are the two set screws seen in the GM100 used for locking position of the mount?

Full Gimbal Mount for Ø1" Optics

  • True Gimbal Design
  • Maximum Optic Thickness: 0.25" (6.4 mm)
  • Mounts Ø1" (25.4 mm) Optics
  • Fine Adjustment Provides ±15° at 1°/rev
  • Fully Lockable Design
  • Superior Kinematic Performance Without Crosstalk

GMB1 optic mount, which is designed to hold Ø1" (Ø25.4 mm) optics up to 0.25" (6.4 mm) thick, features true gimbal motion in order to eliminate crosstalk when steering a beam of light. The point of rotation for both axes is located at the center of the mounted optic’s surface. Utilizing locking thumbscrews and fine pitch adjusters, the GMB1 offers both coarse adjustment and fine tuning.The coarse adjustment allows 360° of manual positioning for both angular degrees of freedom. The fine adjustment allows for ±15° of control, with rotation of the control knob yielding 1° of angular displacement per revolution. The yaw can be adjusted in a similar fashion using the thumbscrew and setscrew closest to the post. After the desired pitch and yaw position is established, the entire mount can be easily locked into place by tightening both thumbscrews and both setscrews. The minimal profile of this mount is ideal for tight beam paths. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
GMB1 Support Documentation
GMB1Customer Inspired!Ø1" Full Gimbal Mount, 360° Adjustable, One Retaining Ring Included
+1 Qty Docs Part Number - Metric Price Available / Ships
GMB1/M Support Documentation
GMB1/MCustomer Inspired!Ø25.4 mm Full Gimbal Mount, Metric, 360° Adjustable, One Retaining Ring Included

Gimbal Mounts for Ø1" or Ø2" Optics

GM200 Gimbal Mirror Mount
Click to Enlarge
The photo above shows the front (left) and back (right) of the GM200 Gimbal mirror mount.
  • True Gimbal Design
  • Maximum Optic Thickness: 0.63" (16 mm)
  • GM100 - Mounts Ø1" (25.4 mm) Optics
  • GM200 - Mounts Ø2" (50.8 mm) Optics
  • Designed for Intra-Cavity Use
  • Angular Range of ±2.5° (GM100) or ±2.0° (GM200)
  • Graduated Adjuster Knobs, 100 TPI Adjusters

Thorlabs' Gimbal Mirror Mounts are designed for intra-cavity use, and incorporate a true gimbal design that locates the optical surface directly on the axis of rotation. The design provides pure rotational motion without angular or positional crosstalk.

Two adjustment knobs (graduated with 50 divisions per revolution) are located on the top surface of the mount, making them easily accessible even if the mount is integrated into an optical cavity. They provide excellent angular positioning performance. The GM100 is designed to hold Ø1" (Ø25.4 mm) optics, while the GM200 is meant for Ø2" (Ø50.8 mm) optics. The mounts are SM1- (1.035"-40) or SM2-threaded (2.035"-40), respectively, for compatibility with our lens tubes and accessories, and each mount includes a retaining ring for securing the optic.

Please Note: Due to the internal drive mechanism, the adjustment knobs on these mounts do not provide perfectly linear motion. For specific measurements, please click here.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
GM100 Support Documentation
GM100Ø1" Gimbal Mirror Mount, Imperial, One Retaining Ring Included
GM200 Support Documentation
GM200Ø2" Gimbal Mirror Mount, Imperial, One Retaining Ring Included
3-5 Days
+1 Qty Docs Part Number - Metric Price Available / Ships
GM100/M Support Documentation
GM100/MØ25.4 mm Gimbal Mirror Mount, Metric, One Retaining Ring Included
GM200/M Support Documentation
GM200/MØ50.8 mm Gimbal Mirror Mount, Metric, One Retaining Ring Included

Ø1" Gimbal Mount for the 30 mm Cage System

KC45D Application
Click to Enlarge

The photos above show the KC45D Gimbal mount in different 30 mm cage system configurations.

  • True Gimbal Design
  • Maximum Optic Thickness: 0.24" (6 mm)
  • Mounts Ø1" Optics
  • Compatible with Thorlabs' 30 mm Cage System
  • Full 360º Rotation of Optic Holder
  • ±30º Rotation on the Optic Holder Saddle

The KC45D Turret Mount is designed to allow a Ø1" optic to be rotated about a point in the center of a 30 mm cage assembly with true gimbal motion. The optic holder is free to rotate through 360º. Once its coarse angular orientation is set, the fine adjustment mechanism (i.e., two 100 TPI adjusters offering an adjustment per revolution of 13 mrad/rev) can be used for precise alignment, using the HKTS-5/64 hex key thumbscrew or any other 5/64" hex key or balldriver. The second angular degree of freedom is achieved by rotation of an intermediate saddle. This saddle connects the optic holder to the cage assembly and is free to rotate ±30º.The optic is secured against the back lip of the SM1 (1.035"-40) center tapped region using the included SM1RR Retaining Ring.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
KC45D Support Documentation
KC45DCage Assembly Turret Mount Ø1" Optics
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