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Goniometer Stages


  • Pure Rotational Motion About a Fixed Point Above the Stage
  • 1° Graduation Marking on Side
  • Accuracy of 10 arcmin

GN1

GNL10

GN05

GNL18

GNL20

GN2

Virtual Rotation Points
of Stacked Stages Align

Related Items


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Features

  • Pure Rotational Motion About a Virtual Point
  • 1° Graduation Marks on Side
  • Backlash-Free Spring-Loaded Design
  • Fully Lockable
  • Small Platform Goniometer Stage: 1" x 1"
  • Large Platform Goniometer Stage: 1.5" x 1.5"
    (Available Motorized)

A goniometer or goniometric stage is a device used to rotate an object precisely, within a small angular range, about a fixed point in space. Goniometers are similar to linear stages, but, rather than providing linear movement, the stage partially rotates about a fixed point above the mounting surface of the stage. In our two product lines, the distance from the point of rotation to the mounting surface was designed so that two different goniometer models may be stacked in an XY configuration and both stages will rotate about the same point. Our goniometers use a backlash-free leadscrew in the smaller GN series and a precision micrometer for enhanced angular positioning of the top plate in the larger GNL series.

Point of Rotation Diagram

Our goniometers offer unobstructed, pure rotational motion about their point of rotation over the angle of rotation (see image to the right). The compact, stackable design allows one model to be fastened to the top plate of another aligning their points of rotation. In the GN series, the GN05(/M) mounts atop the GN1(/M). In the GNL series, the GNL10(/M) mounts atop the GNL18(/M). These two axis stage setups can be purchased as a single package [GN2(/M) or GNL20(/M) respectively].

The precision dovetail design, accompanied by a backlash-free lead screw and a vernier scale, provides accurate and repeatable positioning. A side mounted setscrew can be used to lock the platform in position.

The GN series goniometers provide an array of four 2-56, four 4-40 (M2.5 x 0.45), and eight 6-32 (M3 x 0.5) taps for mounting. This series can be either post mounted via an 8-32 (M4) tap or mounted to a mini series breadboard via the slotted mounting holes.

Alternatively, the GNL series offers twelve 4-40 (M2.5 x 0.45) and sixteen 6-32 (M4 x 0.7) taps. See below or the Specs tab for mounting hole position. Our PM3(/M) and PM4(/M) clamping arms feature 6-32 (M4) threads, allowing them to be attached to most goniometers.

Single-Axis Goniometers

Item #GN05(/M)GN1(/M)GNL10(/M)GNL18(/M)
Distance to Point of
Rotation from Top Surface
0.50" (12.7 mm)1.00" (25.4 mm)1.00" (25.4 mm)1.75" (44.5 mm)
Rotation±15o±10o±10o±5o
Accuracy10 arcmin (0.167°)
Load Capacity0.25 lbs (0.113 kg)1.0 lb (0.45 kg)
Goniometer Dimensions
(W x D x H)
1.00" x 1.00" x 0.50"
(25.4 mm x 25.4 mm x 12.7 mm)
1.50" x 1.50" x 0.75"
(38.1 mm x 38.1 mm x 19.1 mm)
Base Plate Dimensions
(W x D x H)
1.00" x 1.85" x 0.20"
(25.4 mm x 47.0 mm x 5.1 mm)
Imperial Goniometers: 1.50" x 2.50" x 0.20"
Metric Goniometers: 38.1 mm x 62.7 mm x 5.1 mm
Body MaterialAnodized Aluminum

Dual-Axis Goniometers

Item #GN2(/M)GNL20(/M)
Distance to Point of
Rotation from Top Surface
0.50" (12.7 mm)1.00" (25.4 mm)
Rotation±10o / ±15o±5o / ±10o
Accuracy10 arcmin (0.167°)10 arcmin (0.167°)
Load Capacity0.25 lbs (0.113 kg)1.0 lb (0.45 kg)
Goniometer Dimensions1.00" x 1.00" x 1.00"
(25.4 mm x 25.4 mm x 25.4 mm)
1.50" x 1.50" x 1.50"
(38.1 mm x 38.1 mm x 38.1 mm)
Base Plate Dimensions1.00" x 1.85" x 0.20"
(25.4 mm x 47.0 mm x 5.1 mm)
GNL20: 1.50" x 2.50" x 0.20"
GNL20/M: 38.1 mm x 62.7 mm x 5.1 mm
Body MaterialAnodized Aluminum

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GNL Series Mounting Options

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GN Series Mounting Options
Item #% Weight Reduction% CO2 Reduction
GNL10 39% 58%
GNL18 39% 58%
Smart Pack

Smart Pack

  • Minimize CO2 Footprint
  • Reduce Non-Recyclable Packing Materials
  • Improve Packaging Integrity
  • Saves on Shipping Costs

Thorlabs' Green Initiative is aimed at reducing waste. To that end, we have begun to re-engineer our product packaging. The GL10 and GL18 are now shipped in re-engineered packaging that minimizes the use of non-recyclable materials.

Over the course of a year, the re-engineered packaging across our product line is projected to reduce our CO2 footprint by more than 16,184 kg and reduce packaging by over 13,893 pounds! As we move through our product line, we will label re-engineered packages with our green Smart Pack sticker (above).


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Posted Comments:
Poster:yichen_chuang
Posted Date:2016-02-17 23:11:07.903
Hi, a bead and the lock screw went off when I tried to mount the GN1 to a post. Now the goniometer only rotates one way but the other direction we have to manually "push" it to rotate. Is there anyway we can fix it? (the bead was missing unfortunately...) thanks!
Poster:besembeson
Posted Date:2016-03-03 02:23:48.0
Response from Bweh at Thorlabs USA: I will contact you to send this for repair.
Poster:j.fischer
Posted Date:2015-12-30 12:04:43.757
Hi, I would like to use a GN05/M or GN2/M upside down, meaning that I would like to attach my load where the base-plate is right now and I would mount the GN2/M where now the load is supposed to be (likely using a custom baseplate). Is the baseplate removable? Can it be attached to the top surface, or is there another easy way to mount the top surface to another large surface (with custom bores and threads)?
Poster:besembeson
Posted Date:2016-01-04 02:11:11.0
Response from Bweh at Thorlabs USA: Thanks for contacting Thorlabs. You can use this in the upside down configuration, with reduced load capacity. The base plate is connected to the mounting plate through four cap screws so it can be removed. The mounting plate only has threaded holes (around the central mounting area) so attaching this to the top plate (that also has threaded holes) is not recommended. I will contact you if a special adapter plate is needed.
Poster:mark.preddy
Posted Date:2014-07-31 17:04:38.28
I'm considering this goniometer for a vacuum application but am concerned about the lubrication of the dovetails. The device appears to be anodized aluminum, if this is the case, would lubrication be necessary? If they are not aluminum, out of curiosity, what are they made of?
Poster:cdaly
Posted Date:2014-08-07 10:25:09.0
Response from Chris at Thorlabs: Thank you for your inquiry. The main body of the goniometer is made form anodized aluminum. The stage uses apiezon grease, which is vacuum compatible, but the micrometer does not. We may be able to provide one as a custom vacuum version without the micrometer, but due to the tight tolerances on these parts, we would not be able to strip the anodization and would need to make them from scratch.
Poster:alrun.thuemen
Posted Date:2014-05-07 12:05:12.29
We use this Gonoimeter 6 times in our jig. And in some positions the restoring force is not strong enough. Is it possible to change the spring? If yes, do you have alternatives? Do you have think about caps in different colors for the srews. I think it could be very helpful for making instructions how to use jigs. Thx, Thümen
Poster:cdaly
Posted Date:2014-05-08 04:27:33.0
Response from Chris at Thorlabs: Thank you for your inquiry. There may be a possibility of replacing the spring in a custom version to increase the restoring force, but we would likely not be able to provide this at lower quantities. I will contact you directly to discuss this further with you. We would not be able to provide customer color coded actuator screws for the goniometers however.
Poster:mgez
Posted Date:2014-01-13 09:39:52.97
Hi, We need to replace the goniometer spring in GNL 10/M and 18/M - Does it have a part no we can order ? where we can find/buy it? Thx, Motti Gez Lumio
Poster:jlow
Posted Date:2014-01-15 08:25:00.0
Response from Jeremy at Thorlabs: We will contact you for a quote on the springs.
Poster:cbrideau
Posted Date:2013-06-24 21:06:17.773
Can you please tell me how much the GN2 goniometer weighs?
Poster:pbui
Posted Date:2013-06-27 11:03:00.0
Response from Phong at Thorlabs: The GN2 weighs 0.10 pounds.
Poster:
Posted Date:2013-05-17 08:31:20.473
Could you please suggest a method of affixing one of these goniometers to th RP01/M rotation stage?
Poster:cdaly
Posted Date:2013-05-21 13:19:00.0
Response from Chris at Thorlabs: Thank you for using our web feedback. There's really no direct way to mount the two together. You could use a plate such as C1520/M which will attach to the top of the stage with an M6 threaded stud to give you a good mounting surface for the goniometer, but this is probably going to block the reference marking. Would it be possible to use the PR01/M instead? This has a large enough surface with appropriate mounting holes that the goniometer can be mounted directly to. We also have the TTR001 stage available with tip/tilt/rotation adjustment, though it would not have the full 360 degree range of the RP01.
Poster:tcohen
Posted Date:2012-09-13 13:14:00.0
Response from Tim at Thorlabs: The main scale has 1 degree graduations and the Vernier scale increments in 10 arcmin graduations as you noted. If the central line on the Vernier is aligned with a degree mark on the moving platform, this is read in degrees. The line on the Vernier scale that is aligned with one on the rotation dial is the value read in 10 arcmins to give a finer scale to read between the main degree graduations. I will contact you to discuss this and your calculation further.
Poster:huub.de.graaf
Posted Date:2012-09-13 09:53:49.0
I am also struggling with the use of the goniometers. I assumed 1 line (marker) on the goniometer is equivalent to 10 arcmin. This however would mean that 6 full rotations of the goniometer creates a tilt of 25 deg (25*6*10= 1500 arcmin = 25 deg). Somehow I think this is not correct. Please give the correct scale factor.
Poster:jjurado
Posted Date:2011-08-09 18:36:00.0
Response from Javier at Thorlabs to tech: Thank you very much for your feedback. We will considering adding documentation with instructions on the use of the Vernier scale engraved on our goniometers to the website or to the final product. In the meantime, I will contact you with this information.
Poster:tech
Posted Date:2011-08-09 16:03:16.0
Why dont you offer any instructions on how to use your goniometers? Specifically,instructions on how touse the vernier scales to obtain the stated accuracy? Just because I bought one of your stages doesnt mean I know how to use it. I assumed instructions would come with the device, but no. Obviously you guys are much more interested in selling your products than you are in making sure your customers know how to use the products.
Poster:bdada
Posted Date:2011-04-13 15:47:00.0
Response from Buki at Thorlabs to Harald: The maximum load is limited by the pulling force of the springs inside. Therefore, it should be the same even when it is mounted upside down. If you have further questions, please email TechSupport@thorlabs.com
Poster:harald.hovland
Posted Date:2011-04-13 17:09:56.0
I am interested in a product to mount a camera vertically and adjust it with reasonably good precision. The GNL20/M might be an option if i can mount the goniometer upside-down and hang the camera under the goniometer. The question is if the goniometer can be mounted this way and support this (negative) load. The camera with lens weights approx. 350 gram, and i could probably manage to produce an extra bracket weighing less than 100 g to be within the 1 lb stated. I assume the weight limit is stated for nominal (not upside-down) operation, though?
Poster:Greg
Posted Date:2011-01-13 08:22:38.0
A response from Greg at Thorlabs to johannes.trapp: In order to change the adjuster, a bushing is needed with the same dimensions as the stock bushing. Unfortunately, we do not have any other bushings that will fit the GN2/M without a redesign of the product. We will contact you to discuss this further.
Poster:johannes.trapp
Posted Date:2010-12-21 09:00:01.0
Hallo, is there a possibility to change the screws for the GN2/M in order to achieve a higher precision? If so, which screws are compatible? thanks
Poster:Thorlabs
Posted Date:2010-06-28 13:29:27.0
Response from Javier at Thorlabs to david.thompson: we offer thread adapters that may work for mounting different optics or other components onto the GNL10. For example, if you are looking to mount a prism, you can use our our PM1 and PM2 clamping arms, which have #6-32 threads. We could also discuss the design of a custom plate, although the use of such a plate would shorten the distance to the point of rotation of the stage. I will contact you directly to discuss your application a bit further.
Poster:david.thompson
Posted Date:2010-06-27 17:33:08.0
I just bought two of these. I didnt look carefully enough at the mounting holes. My lab is basically standardized on 1/4-20. So most of my mounts will not interface easily with these goniometers. Can you recommend an adapter plate? It would be great if that were listed as a possible accessory on this page.
Poster:ghegenbart
Posted Date:2008-06-26 09:27:59.0
The GNxx/M series products have M3 mounting holes. Please add information on the pitch to the drawings. Both M3-0.20 and M3-0.25 are common, so it may happen that a user has M3 screws that dont fit and he is wondering why.
Poster:bob
Posted Date:2008-01-21 10:34:53.0
Dear Sir, This appears to be some thing that We are looking for. May I request you to send us a little more detailed Brochure, for Prism measurements. a. Please confirm whether it is possible to have a digital readout hooked to the above Angles measurement of Prism . b. Will it be possible to have a computer Interface with the said instrument. Please reply even if the accesories are to be procured from else where since we are looking for a total set up with a digital readout and computer interface. In case This instrument is compatible for the accessories mentioned above then perhaps that is what we are looking for. You may suggest also about the vendors who could supply the digital readouts and computer interface suitable and compatinle to your instrument. We are trying to measure the refractive Angles and not mearly reflective angles whcih may please be noted. We shall be obliged for an early reply. Best regards. BOB

Goniometers: Small Platform


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Small Platform Goniometer Dimensions

Click for Details

Mounting Options
Item #GN05(/M)GN1(/M)GN2(/M)
Distance to Point Rotation from Top Surface 0.50" (12.7 mm) 1.00" (25.4 mm) 0.50" (12.7 mm)
Rotation ±15o ±10o ±10o / ±15o
Accuracy 10 arcmin (0.167°)
Load Capacity 0.25 lbs (0.113 kg)
Goniometer Dimensions (W x D x H) 1.00" x 1.00" x 0.50"
(25.4 mm x 25.4 mm x 12.7 mm)
1.00" x 1.00" x 1.00"
(25.4 mm x 25.4 mm x 25.4 mm)
Base Plate Dimensions (W x D x H) 1.00" x 1.85" x 0.20"
(25.4 mm x 47.0 mm x 5.1 mm)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
GN05 Support Documentation
GN05Small Goniometer with 1/2" Distance to Point of Rotation, ±15º Adjustment
$141.00
Today
GN1 Support Documentation
GN1Small Goniometer with 1" Distance to Point of Rotation, ±10º
$146.00
Today
GN2 Support Documentation
GN2Small Dual-Axis Goniometer, 1/2" Distance to Point of Rotation, 2 Goniometers and Base
$287.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
GN05/M Support Documentation
GN05/MSmall Goniometer with 12.7 mm Distance to Point of Rotation, ±15º, Metric
$141.00
Today
GN1/M Support Documentation
GN1/MSmall Goniometer with 25.4 mm Distance to Point of Rotation, ±10º, Metric
$146.00
Today
GN2/M Support Documentation
GN2/MSmall Dual-Axis Goniometer, 12.7 mm Distance to Point of Rotation, 2 Goniometers and Base, Metric
$287.00
Today

Goniometers: Large Platform


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Large Platform Goniometer Dimensions

Click for Details

Mounting Options
Item #GNL10(/M)GNL18(/M)GNL20(/M)
Distance to Point of Rotation from Top Surface 1.00" (25.4 mm) 1.75" (44.5 mm) 1.00" (25.4 mm)
Rotation ±10o ±5o ±5o / ±10o
Accuracy 10 arcmin (0.167°)
Load Capacity 1.0 lb (0.45 kg)
Goniometer Dimensions (W x D x H) 1.50" x 1.50" x 0.75"
(38.1 mm x 38.1 mm x 19.1 mm)
1.50" x 1.50" x 1.50"
(38.1 mm x 38.1 mm x 38.1 mm)
Base Plate Dimensions (W x D x H) Imperial Goniometers: 1.50" x 2.50" x 0.20"
Metric Goniometers: 38.1 mm x 62.7 mm x 5.1 mm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
GNL10 Support Documentation
GNL10Large Goniometer, 1" Distance to Point of Rotation, ±10º
$259.00
Today
GNL18 Support Documentation
GNL18Large Goniometer, 1.75" Distance to Point of Rotation, ±5º
$267.00
Today
GNL20 Support Documentation
GNL20Large Dual-Axis Goniometer, 1" Distance to Point of Rotation, 2 Goniometers and Base
$525.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
GNL10/M Support Documentation
GNL10/MLarge Goniometer, 25.4 mm Distance to Point of Rotation, ±10º, Metric
$259.00
Today
GNL18/M Support Documentation
GNL18/MLarge Goniometer, 44.5 mm Distance to Point of Rotation, ±5º, Metric
$267.00
Today
GNL20/M Support Documentation
GNL20/MLarge Dual-Axis Goniometer, 25.4 mm Distance to Point of Rotation, 2 Goniometers and Base, Metric
$525.00
3-5 Days
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