Products Home / Optomechanical Components / Optomechanical Mounts / Optical Mirror Mounts / Polaris® Mirror Mounts / SM-Threaded Polaris Mirror Mounts / Polaris® SM1-Threaded Low-Drift Kinematic Mirror MountsPolaris® SM1-Threaded Low-Drift Kinematic Mirror Mounts
- SM1-Threaded Mounting Bore
- Matched Actuator and Back Plate Threading Minimize Drift and Backlash
- Minimal Temperature-Dependent Hysteresis
- Sapphire Adjuster Seats Prevent Wear Over Time
Application Idea
POLARIS-K1T Mount Shown with a Large Beam Fiber Collimator and AD15F Adapter
POLARIS-K1T2
2 Hex Adjusters
POLARIS-K1T
3 Adjuster Knobs
Please Wait
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Figure 1.2 Each Polaris mount undergoes extensive thermal testing to ensure high-quality performance. Please see the Test Data tab for additional test results.
Click to Enlarge
Figure 1.1 Polaris mounts have two Ø2 mm dowel pin holes by each #8 (M4) counterbore for alignment.
| Quick Links | |
|---|---|
| Ø1" Mounts with 3 Adjusters | |
| Ø1" Mounts with 2 Adjusters | |
| Adjuster Accessories | |
| Lock Nut | |
| Locking Collar | |
| Torque Wrench |
Features
- Machined from Heat-Treated Stainless Steel with Low Coefficient of Thermal Expansion (CTE)
- SM1-Threaded Bore for Mounting Optics, Lens Tubes, or Other Components
- Hardened Stainless Steel Ball Contacts with Sapphire Seats for Durability and Smooth Movement
- Matched Actuator and Back Plate Provide Stability and Smooth Kinematic Adjustment
- Extensive Testing Guarantees Less than 1 μrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab for Details)
- Passivated Stainless Steel Surface Ideal for Vacuum and High-Power Laser Cavity Applications
- Custom Mount Configurations are Available by Contacting Tech Support
Polaris® SM1-Threaded Kinematic Mirror Mounts are the ultimate solution for applications requiring stringent long-term alignment stability.
Optic Retention
All of the mounts sold here feature an SM1-threaded (1.035"-40) bore which allows a variety of optical components to be secured in the mount. Two stainless steel retaining rings are included with each mount; additional retaining rings can also be purchased separately.
Polaris optic bores are precision machined to achieve a fit that will provide optimum beam pointing stability over changing environmental conditions such as temperature changes, transportation shock, and vibration. Performance will be diminished if these mounts are used with optics that have an outer diameter tolerance greater than zero or smaller metric optic sizes (Ø25 mm).
Design
Machined from heat-treated stainless steel, Polaris mounts utilize precision-matched adjusters with ball contacts and sapphire seats to provide smooth kinematic adjustment. As shown on the Test Data tab, these mounts have undergone extensive testing to ensure high-quality performance. The Polaris design addresses all of the common causes of beam misalignment; please refer to the Design Features tab for detailed information.
Post Mounting
The Polaris mirror mounts are equipped with #8 (M4) counterbores for post mounting and Ø2 mm alignment pin holes around the mounting counterbore for precision alignment when paired with our Ø1" Posts for Polaris Mirror Mounts. We also recommend using a torque driver or spanner wrench to accurately install the optic and prevent optical surface distortion. See the Usage Tips tab for more recommendations on mounting configurations.
Cleanroom and Vacuum Compatibility
All Polaris mounts, lock nuts, and locking collars sold on this page are designed to be compatible with cleanroom and vacuum applications. See the Specs tab and the Design Features tab for details.
| Item # Suffixa | -K1T | -K1T3 | -K1T1 | -K1T2 |
|---|---|---|---|---|
| Optic Sizes | Ø1" | |||
| Optic Thickness (Max) | 0.34" (8.6 mm) | |||
| Number of Adjusters | Three | Two | ||
| Adjuster Drive | Removable Knobs |
5/64" Hex | Removable Knobs |
5/64" Hex |
| Adjuster Pitch | 100 TPI Matched Actuator/Body Pairs | |||
| Measured Point-to-Point Mechanical Resolution per Adjuster |
5 µrad (Typical) 2 µrad (Achievable) |
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| Measured Adjuster Lock Mechanical Resolution per Adjuster |
5 µrad (Typical) 2 µrad (Achievable) |
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| Resolutionb | ~7.7 mrad/rev | |||
| Front Plate Translation (Max) | 6 mm | N/A | ||
| Mechanical Angular Range (Nominal) | ±4° | |||
| Beam Deviationc After Thermal Cycling | <1 µrad | |||
| Recommended Optic Mounting Torque | 5 - 24 oz-in for 8.6 mm Thick Optics | |||
| Maximum SM-Threaded Component Mounting Torqued | 30 lb-in for SM1-Threaded Parts | |||
| Maximum Front Plate Payload (Torque / Weight) |
1 lb-in (0.11 N·m) / 1 lb (4.5 N) | |||
| Mountinge | Two #8 (M4) Counterbores | |||
| Alignment Pin Holes | Two Ø2 mm Holes for DIN 7-m6 Ground Dowel Pin at Each Counterbore | |||
| Vacuum Compatibilityf | 10-9 Torr at 25 °C with Proper Bake Out; 10-5 Torr at 25 °C without Bake Out DuPont Krytox® LVP High-Vacuum Grease Vapor Pressure: 10-13 Torr at 20 °C ,10-5 Torr at 200 °C EPO-TEK® 353ND (353NDPK) Epoxy Meets Low Outgassing Standards NASA ASTM E595, Telcordia GR-1221 |
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| Operating Temperature Range | -30 to 200 °C | |||
Polaris® Mirror Mounts Test Data
All of the Polaris Low-Drift Kinematic Mirror Mounts have undergone extensive testing to ensure high-quality performance. After mounting the Polaris to a Ø1" stainless steel post, the mirror and post assembly was secured to a stainless steel optical table in a temperature-controlled environment. A beam from an independently temperature-stabilized laser diode was reflected by the mirror onto a position sensing detector. The mirror was secured between the two retaining rings included with the Polaris mount, not using epoxy.
Positional Repeatability After Thermal Shock
Purpose: This testing was done to determine how reliably the mount returns the mirror, without hysteresis, to its initial position. These measurements show that the alignment of the optical system is unaffected by the temperature shock.
Procedure: The temperature of each mirror mount tested was elevated and maintained for a given soak time. Then the temperature of the mirror mount was returned to the starting temperature. The results of these tests are shown in Figures 3.1 - 3.4.
Results: As can be seen in the plots in Figures 3.1 - 3.4, when the Polaris mounts were returned to their initial temperature, the angular position (both pitch and yaw) of the mirrors returned to within 1 µrad of its initial position. The performance of the Polaris was tested further by subjecting the mount to repeated temperature change cycles. After each cycle, the mirror’s position reliably returned to within 1 µrad of its initial position.
For Comparison: To get a 1 µrad change in the mount’s position, the 100 TPI adjuster on a Ø1" Polaris mount needs to be rotated by only 0.05° (1/7200 of a turn). A highly skilled operator might be able to make an adjustment as small as 0.3° (1/1200 of a turn), which corresponds to a 6 µrad change in the mount's position.
Conclusions: The Polaris Mirror Mounts are high-quality, ultra-stable mounts that will reliably return a mirror to its original position after cycling through a temperature change. As a result, the Polaris mounts are ideal for use in applications that require long-term alignment stability.
 Click to Enlarge Figure 3.1 This plot shows the pitch and yaw deviation of a POLARIS-K1T mount as it undergoes a heating and cooling cycle. |
 Click to Enlarge Figure 3.w This plot shows the pitch and yaw deviation of a POLARIS-K1T1 mount as it undergoes a heating and cooling cycle. |
 Click to Enlarge Figure 3.3 This plot shows the final angular position of a POLARIS-K1T mount for 10 consecutive thermal shock tests. The change in temperature is the difference between the starting temperature and the temperature at the end of the test.  Click to Enlarge Figure 3.4 This plot shows the final angular position of a POLARIS-K1T2 mount for 20 consecutive thermal shock tests. The change in temperature is the difference between the starting temperature and the temperature at the end of the test and includes factors such as the variation in room temperature. |
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Figure 4.1 Design Features of Polaris SM1-Threaded Mounts
Several common factors typically lead to beam misalignment in an optical setup. These include temperature-induced hysteresis of the mirror's position, crosstalk, drift, and backlash. Polaris mirror mounts are designed specifically to minimize these misalignment factors and thus provide extremely stable performance. Hours of extensive research, multiple design efforts using sophisticated design tools such as finite element analysis software, and months of rigorous testing went into choosing the best components to provide an ideal solution for experiments requiring ultra-stable performance from a kinematic mirror mount.
Thermal Hysteresis
The temperature in most labs is not constant due to factors such as air conditioning, the number of people in the room, and the operating states of equipment. Thus, it is necessary that all mounts used in an alignment-sensitive optical setup be designed to minimize any thermally induced alignment effects. Thermal effects can be minimized by choosing materials with a low coefficient of thermal expansion (CTE), like stainless steel. However, even mounts made from a material with a low CTE do not typically return the mirror to its initial position when the initial temperature is restored. All the critical components of the Polaris mirror mounts are heat treated prior to assembly since this process removes internal stresses that can cause a temperature-dependent hysteresis. As a result, the alignment of the optical system will be restored when the temperature of the mirror mount is returned to the initial temperature.
The method by which the mirror is secured in the mount is another important design factor for the Polaris; these Polaris mounts offer excellent performance without the use of adhesives. Instead, they have SM1-threaded bores and two stainless steel retaining rings that hold the optic in place. The holding force provided by the stainless steel retaining rings is sufficient to keep the mirror locked into place regardless of the ambient temperature. This bore also allows other SM1-threaded components to be secured in the mounts.
Crosstalk
Crosstalk is minimized by carefully controlling the dimensional tolerances of the front and back plates of the mount so that the pitch and yaw actuators are orthogonal. In addition, sapphire seats are used at all three contact points. Standard metal-to-metal actuator contact points will wear down over time. The polished sapphire seats of the Polaris mounts, in conjunction with the hardened stainless steel actuator tips, maintain the integrity of the contact surfaces over time.
Drift and Backlash
In order to minimize the positional drift of the mirror mount and backlash, it is necessary to limit the amount of play in the adjuster as well as the amount of lubricant used. When an adjustment is made to the actuator, the lubricant will be squeezed out of some spaces and built up in others. This non-equilibrium distribution of lubricant will slowly relax back into an equilibrium state. However, in doing so, this may cause the position of the front plate of the mount to move. The Polaris mounts use adjusters matched to the body that exceed all industry standards so very little adjuster lubricant is needed. These adjusters have a smooth feel that allows the user to make small, repeatable adjustments.
Cleanroom and Vacuum Compatibility
All Polaris mounts sold on this page are designed to be compatible with cleanroom and vacuum chamber applications. They are chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, they are assembled in a clean environment and then double vacuum bagged to eliminate contamination when transported into a cleanroom.
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Figure 4.2 Polaris Mounts are Shipped Inside Two Vacuum Bag Layers
The sapphire contacts are bonded into place using a NASA-approved low outgassing procedure. In addition, DuPont LVP High-Vacuum (Krytox) Grease, an ultra-high vacuum compatible, low outgassing PTFE grease, is applied to the adjusters. These features provide high vacuum compatibility and low outgassing performance. When operating at pressures below 10-5 Torr, we highly recommend using an appropriate bake out procedure prior to installing the mount in order to minimize contamination caused by outgassing. Please note that the 8-32 and M4 cap screws included with the Polaris mounts are not rated for pressures below 10-5 Torr.
Cleanroom-Compatible Packaging
Each vacuum-compatible Polaris mount is packaged within two vacuum bag layers after assembly in a clean environment, as seen in Figure 4.2. The vacuum-tight fit of the bags stabilizes the mount, limiting translation of the front plate due to shocks during transportation. The tight fit also minimizes rubbing against the bag, preventing the introduction of bag material shavings that would contaminate the clean mount.
In the vacuum-sealing process, moisture-containing air is drawn out of the packaging. This eliminates unwanted reactions on the surface of the mount without the need for desiccant materials. The vacuum bags protect the mount from contamination by air or dust during transport and storage, and the double-vacuum bag configuration allows for a straightforward and effective cleanroom entry procedure. The outer bag can be removed outside of the cleanroom, allowing the contaminant-free inner bag to be placed into a clean container and transferred into the cleanroom while retaining the benefits of vacuum-bag packaging. Inside the cleanroom, the mount can be removed from the inner bag when ready for use.
Click for Details
Figure 5.1 Spanner Bits and the TD24 Torque Driver Can Be Used to Mount Optics in SM-Threaded Polaris Mirror Mounts
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Figure 5.2 POLARIS-K1T with Mounted Large Beam Fiber Collimator using the AD15F Thread Adapter
Through thermal changes and vibrations, the Polaris kinematic mirror mounts are designed to provide years of use. Below are some usage tips to ensure that the mount provides optimal performance.
Match Materials
Due to its relatively low coefficient of thermal expansion, stainless steel was chosen as the material from which to fabricate the front and back plates of the Polaris mounts. When mounting, we recommend using components fabricated from the same material, such as our Ø1" Posts for Polaris Mirror Mounts and Non-Bridging Clamping Arms.
Use a Wide Post
The Polaris' performance is optimized for use with our Ø1" Posts and our POLARIS-CA1(/M) clamping arm. These posts are made of stainless steel and provide two lines of contact with the mount, which help confine the bottom of the mount during variations in the surrounding temperature, thereby minimizing potential alignment issues.
Optic Mounting
Since an optic is prone to movement within its mounting bore, all optics should be mounted with the Polaris out of the setup to ensure accurate mounting that will minimize misalignment effects. As shown in Figure 5.1, we recommend using a TD24 torque wrench with an SPB1 Spanner Bit for SM1-threaded Polaris mounts. See the Specs tab for the recommended torque. Over torquing the optic retaining rings can result in dramatic surface distortions.
Mounting SM1-Threaded Components
Since the front plate of the Polaris mount can move independently from the back plate, it is important to secure the front plate while mounting SM-threaded components. This ensures that the front plate will not rotate with respect to the back plate and crack the sapphire seats at the contact point between the two plates.
Front Plate’s Position
These Polaris mounts are designed to allow adjustments of up to 8°. To achieve the best performance, it is recommended that the front plate be kept as parallel as possible to the back plate. This ensures the highest stability of the adjustments.
Mount as Close to the Table’s Surface as Possible
To minimize the impact of vibrations and temperature changes, it is recommended that your setup has as low of a profile as possible. Using short posts will reduce the Y-axis translation caused by temperature variations and will minimize any movements caused by vibrations. Mount the Polaris directly onto a flat surface such as a breadboard using a 8-32 to 1/4"-20 thread adapter (AE8E25E) or M4 x 0.7 to M6 x 1.0 adapter (AE4M6M). Using this mounting method, the instability introduced by a post will be eliminated.
Video 5.3 Lock nut installation demonstrated with the POLARIS-LN1 lock nut on one of our low-distortion Polaris mounts. To install a lock nut without cross threading, gently place the lock nut against the end of the adjuster. "Unscrew" the nut until the threads of the nut and the adjuster align; then thread the nut onto the adjuster.
Polish and Clean the Points of Contact
We highly recommend that the points of contact between the mount and the post, as well as the post and the table, are clean and free of scratches or defects. For best results, we recommend using a polishing stone to clean the table’s surface and a polishing pad (LF1P) for the top and bottom of the post as well as the bottom of the mount.
Not Recommended
We do not recommend taking the adjusters out of the body, as it can contaminate the threading. This can reduce the fine adjustment performance significantly. Also, do not pull the front plate away as it might stretch the springs beyond their operating range or crack the sapphire seats.
Adjuster Lock Nuts
The mounts below are compatible with the POLARIS-LN1 lock nuts for long-term stability or applications that are exposed to shock and vibration. The beam can be held on target with the adjuster thumbscrew or hex key while lightly tightening the lock nut by hand or with a thin-head wrench or cone wrench. For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened by hand to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). If long term stability is required, the torque wrenches below can be used to apply the appropriate amount of torque to each lock nut (see Table 714C for torque values). The POLARIS-LN1 lock nuts have a 13 mm hex.
To avoid cross threading the POLARIS-LN1 during installation, place it against the adjuster and "unscrew" the lock nut until you feel a slight drop, then thread the lock nut onto the adjuster (see Video 5.3). Each lock nut is pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and has been tested for adjuster fit.
| SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 0.535"-40.0 UNS-2A | Internal Thread, 0.535"-40.0 UNS-2B | ||
| Max Major Diameter | 0.5340" | Min Major Diameter | 0.5350" |
| Min Major Diameter | 0.5289" | Min Pitch Diameter | 0.5188" |
| Max Pitch Diameter | 0.5178" | Max Pitch Diameter | 0.5230" |
| Min Pitch Diameter | 0.5146" | Min Minor Diameter (and 83.3% of Thread) | 0.508" |
| Max Minor Diameter | 0.5069" | Max Minor Diameter (and 64.9% of Thread) | 0.514" |
| RMS Threading: Objective, Scan, and Tube Lenses | |||
|---|---|---|---|
| External Thread, 0.800"-36.0 UNS-2A | Internal Thread, 0.800"-36.0 UNS-2B | ||
| Max Major Diameter | 0.7989" | Min Major Diameter | 0.8000" |
| Min Major Diameter | 0.7934" | Min Pitch Diameter | 0.7820" |
| Max Pitch Diameter | 0.7809" | Max Pitch Diameter | 0.7866" |
| Min Pitch Diameter | 0.7774" | Min Minor Diameter (and 83.3% of Thread) | 0.770" |
| Max Minor Diameter | 0.7688" | Max Minor Diameter (and 64.9% of Thread) | 0.777" |
| C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras | |||
|---|---|---|---|
| External Thread, 1.000"-32.0 UN-2A | Internal Thread, 1.000"-32.0 UN-2B | ||
| Max Major Diameter | 0.9989" | Min Major Diameter | 1.0000" |
| Min Major Diameter | 0.9929" | Min Pitch Diameter | 0.9797" |
| Max Pitch Diameter | 0.9786" | Max Pitch Diameter | 0.9846" |
| Min Pitch Diameter | 0.9748" | Min Minor Diameter (and 83.3% of Thread) | 0.966" |
| Max Minor Diameter | 0.9651" | Max Minor Diameter (and 64.9% of Thread) | 0.974" |
| SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 1.035"-40.0 UNS-2A | Internal Thread, 1.035"-40.0 UNS-2B | ||
| Max Major Diameter | 1.0339" | Min Major Diameter | 1.0350" |
| Min Major Diameter | 1.0288" | Min Pitch Diameter | 1.0188" |
| Max Pitch Diameter | 1.0177" | Max Pitch Diameter | 1.0234" |
| Min Pitch Diameter | 1.0142" | Min Minor Diameter (and 83.3% of Thread) | 1.008" |
| Max Minor Diameter | 1.0068" | Max Minor Diameter (and 64.9% of Thread) | 1.014" |
| SM30 Threading: Ø30 mm Lens Tubes | |||
|---|---|---|---|
| External Thread, M30.5 x 0.5 – 6H/6g | Internal Thread, M30.5 x 0.5 – 6H/6g | ||
| Max Major Diameter | 30.480 mm | Min Major Diameter | 30.500 mm |
| Min Major Diameter | 30.371 mm | Min Pitch Diameter | 30.175 mm |
| Max Pitch Diameter | 30.155 mm | Max Pitch Diameter | 30.302 mm |
| Min Pitch Diameter | 30.059 mm | Min Minor Diameter (and 83.3% of Thread) | 29.959 mm |
| Max Minor Diameter | 29.938 mm | Max Minor Diameter (and 64.9% of Thread) | 30.094 mm |
| SM1.5 Threading: Ø1.5" Lens Tubes | |||
|---|---|---|---|
| External Thread, 1.535"-40 UNS-2A | Internal Thread, 1.535"-40 UNS-2B | ||
| Max Major Diameter | 1.5339" | Min Major Diameter | 1.535" |
| Min Major Diameter | 1.5288" | Min Pitch Diameter | 1.5188" |
| Max Pitch Diameter | 1.5177" | Max Pitch Diameter | 1.5236" |
| Min Pitch Diameter | 1.5140" | Min Minor Diameter (and 83.3% of Thread) | 1.508" |
| Max Minor Diameter | 1.5068" | Max Minor Diameter (and 64.9% of Thread) | 1.514" |
| SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems | |||
|---|---|---|---|
| External Thread, 2.035"-40.0 UNS-2A | Internal Thread, 2.035"-40.0 UNS-2B | ||
| Max Major Diameter | 2.0338" | Min Major Diameter | 2.0350" |
| Min Major Diameter | 2.0287" | Min Pitch Diameter | 2.0188" |
| Max Pitch Diameter | 2.0176" | Max Pitch Diameter | 2.0239" |
| Min Pitch Diameter | 2.0137" | Min Minor Diameter (and 83.3% of Thread) | 2.008" |
| Max Minor Diameter | 2.0067" | Max Minor Diameter (and 64.9% of Thread) | 2.014" |
| SM3 Threading: Ø3" Lens Tubes | |||
|---|---|---|---|
| External Thread, 3.035"-40.0 UNS-2A | Internal Thread, 3.035"-40.0 UNS-2B | ||
| Max Major Diameter | 3.0337" | Min Major Diameter | 3.0350" |
| Min Major Diameter | 3.0286" | Min Pitch Diameter | 3.0188" |
| Max Pitch Diameter | 3.0175" | Max Pitch Diameter | 3.0242" |
| Min Pitch Diameter | 3.0133" | Min Minor Diameter (and 83.3% of Thread) | 3.008" |
| Max Minor Diameter | 3.0066" | Max Minor Diameter (and 64.9% of Thread) | 3.014" |
| SM4 Threading: Ø4" Lens Tubes | |||
|---|---|---|---|
| External Thread, 4.035"-40 UNS-2A | Internal Thread, 4.035"-40.0 UNS-2B | ||
| Max Major Diameter | 4.0337" | Min Major Diameter | 4.0350" |
| Min Major Diameter | 4.0286" | Min Pitch Diameter | 4.0188" |
| Max Pitch Diameter | 4.0175" | Max Pitch Diameter | 4.0245" |
| Min Pitch Diameter | 4.0131" | Min Minor Diameter (and 83.3% of Thread) | 4.008" |
| Max Minor Diameter | 4.0066" | Max Minor Diameter (and 64.9% of Thread) | 4.014" |
| Posted Comments: | |
Malo Raoul
(posted 2024-04-04 10:26:24.267) We are currently using your Polaris-K2T2 but we have issues with the 1/4"-100 screws. We wish to adapt your F25US150 screws to our needs and replace the K2T2 screws with the modified ones. What would be your take on that ? To what extent are the "Matched Actuator and Back Plate Threading" paired together ? Thank you very much. cdolbashian
(posted 2024-04-26 02:15:18.0) Thank you for reaching out to us with this inquiry. I have contacted you directly to discuss the method we employ for plate/screw matching, as well as to discuss the option for a custom/modified adjuster screw which would have the same performance as the stock component. user
(posted 2022-10-14 11:44:17.903) Lens tubes can only be mounted on one side of the threaded Polaris mounts. Mounting lens tubes on the back face of the mount interferes with the mount. It would be great if the interference could be removed so that one can mount lens tube on both sides... cdolbashian
(posted 2022-10-24 09:16:18.0) Thank you for this feedback Michael. I have submitted this to our internal product development forum, as this type of change does not seem too difficult to consider for the future. user
(posted 2019-05-15 06:09:55.26) Hi
May i ask how long it can be lifted in Z-axis?
Thank you YLohia
(posted 2019-05-15 09:13:44.0) Hello, the POLARIS-K05T6 can be translated by a maximum of 5mm in the z-direction. m.duranddegevigney
(posted 2017-07-06 10:49:23.553) Hello,
Would it be possible to mount 2 or 3 piezo electric actuators on this Mount. (like on K05P2).
Best regards. nbayconich
(posted 2017-08-04 05:39:05.0) Thank you for contacting Thorlabs. I will reach out to you directly about our custom capabilities. mesmail
(posted 2015-09-18 09:10:25.813) Hi. I am using POLARIS-K1T8 for light collimation in outdoor. The problem is that under sun heating, the alignment deviates because thermal expansion of the POLARIS-K1T8. So at night, it works well but during the day, I loss the signal. Is there a solution or other item to use so that I have unchanged alignment. besembeson
(posted 2015-10-05 01:27:51.0) Response from Bweh at Thorlabs USA: We specify a 2 urad deviation after 12.5 deg C temperature cycling based of our extensive testing of these mounts with matched and low coefficient of thermal expansion, which is clearly not suitable for your application. However, it will be almost impossible to find such mounts made from material that can accommodate such large temperature fluctuations without leading to thermal stress that will cause misalignment. We don't have any better solution to these. It seems you may benefit from two or more sets of alignment states to cover the entire temperature variation range. If you have a target, you may also increase its area (if possible) to accommodate deviations. user
(posted 2014-03-06 16:46:22.29) The series is expanding. Don't know how we can select one from your product line. Do you have a selction guide kindly? myanakas
(posted 2014-03-06 08:20:25.0) Response from Mike at Thorlabs: We do offer a selection guide. It is located on every Polaris page and is on a tab called "Polaris Comparison". Within this tab each Polaris mirror mount is organized via item # suffix, and in this row you can click on the blue hyperlinked suffixes to view the product and, if you wish, add it to your cart. This link will bring you directly to this tab on the SM-threaded Polaris page (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6634&tabname=polaris comparison). cbrideau
(posted 2014-01-21 13:04:16.157) Regarding the indexing hole for a 2mm dowel pins: Would it be possible to put a matched hole on your 1" posts and sell the dowel? That way the mount could be rotationally locked when it is attached to the top of the post. It would cut down on another degree of freedom that the mount can walk. jlow
(posted 2014-01-27 04:50:22.0) Response from Jeremy at Thorlabs: I will contact you on quoting this. |
Thorlabs offers several different general varieties of Polaris mounts, including kinematic side optic retention, SM-threaded, low optic distortion, piezo-actuated, vertical drive, and glue-in optic mounts, a fixed monolithic mirror mount and fixed optic mounts, XY translation mounts, 5-axis kinematic mount, and a kinematic platform mount. Refer to the tables below for our complete line of Polaris mounts, grouped by mount type, optic bore size, and then arranged by optic retention method and adjuster type (or intended application in the case of fixed mounts). We also offer a line of accessories that have been specifically designed for use with our Polaris mounts; these are listed in Table 103G. Note that the tables below list Item # suffixes that omit the "POLARIS" prefix for brevity. Click the photos below for details.
| Table 103A Polaris Mount Optic Retention Methods | |||
|---|---|---|---|
| Side Lock | SM Threaded | Low Distortion | Glue-In |
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| Table 103B Polaris Mount Adjuster Types | |||||
|---|---|---|---|---|---|
| Side Hole | Hex | Adjuster Knobs | Adjuster Lock Nuts |
Piezo Adjusters | Vertical-Drive Adjusters |
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| Table 103C Polaris Kinematic Mounts for Round Optics | ||||
|---|---|---|---|---|
| Optic Retention Method | Side Lock | SM Threaded | Low Distortion | Glue-In |
| Ø1/2" Optics | ||||
| 2 Side Hole Adjusters | - | - | - | -K05C4 -K05G4 |
| 2 Hex Adjusters | -K05S1 | -K05T1 | -K05F1 | - |
| 2 Adjusters with Lock Nuts | -K05S2 | -K05T2 | -K05F2 | - |
| 2 Piezoelectric Adjusters | -K05P2 | - | - | - |
| 2 Vertical Adjusters | -K05VS2 -K05VS2L |
- | - | - |
| 3 Hex Adjusters | -K05 | - | - | - |
| 3 Adjusters with Lock Nuts | - | -K05T6 | -K05F6 | - |
| 3 Adjuster Knobs (Tip/Tilt/Z) & 2 Hex Adjusters (X/Y) |
- | -K05XY | - | - |
| Ø19 mm (3/4") Optics | ||||
| 2 Side Hole Adjusters | -K19S4 | - | -K19F4/M | -K19G4 |
| Ø25 mm Optics | ||||
| 2 Side Hole Adjusters | -K25S4/M | - | -K25F4/M | - |
| Ø1" Optics | ||||
| 2 Side Hole Adjusters | -K1S4 | - | - | -K1C4 -K1G4 |
| 2 Hex Adjusters | -K1E2 -K1-2AH |
-K1T2 | -K1F2 | - |
| 2 Adjuster Knobs | - | -K1T1 | -K1F1 | - |
| 2 Piezoelectric Adjusters | -K1S2P | - | - | - |
| 2 Vertical Adjusters | -K1VS2 -K1VS2L |
- | - | - |
| 3 Side Hole Adjuster | -K1S5 | - | - | - |
| 3 Hex Adjusters | -K1E3 -K1-H |
-K1T3 | - | - |
| 3 Adjuster Knobs | -K1E -K1 |
-K1T | -K1F | - |
| 3 Piezoelectric Adjusters | -K1S3P | - | - | - |
| 3 Adjuster Knobs (Tip/Tilt/Z) & 2 Hex Adjusters (X/Y) |
- | -K1XY | - | - |
| Optic Retention Method | Side Lock | SM Threaded | Low Distortion | Glue-In |
| Ø1.5" Optics | ||||
| 2 Side Hole Adjusters | -K15S4 | - | -K15F4 | - |
| 2 Vertical Adjusters | -K15VS2 -K15VS2L |
- | - | - |
| 3 Adjuster Knobs (Tip/Tilt/Z) & 2 Hex Adjusters (X/Y) |
- | -K15XY | - | - |
| Ø50 mm Optics | ||||
| 2 Side Hole Adjusters | -K50S4/M | - | -K50F4/M | - |
| Ø2" Optics | ||||
| 2 Hex Adjusters | -K2S2 | -K2T2 | -K2F2 | - |
| 2 Adjuster Knobs | -K2S1 | -K2T1 | -K2F1 | - |
| 2 Piezoelectric Adjusters | -K2S2P | - | - | - |
| 2 Vertical Adjusters | -K2VS2 -K2VS2L |
- | - | - |
| 3 Hex Adjusters | -K2S3 | -K2T3 | -K2F3 | - |
| 3 Adjuster Knobs | -K2 | -K2T | -K2F | - |
| Ø3" Optics | ||||
| 2 Side Hole Adjusters | -K3S4 | - | - | - |
| 3 Side Hole Adjusters | -K3S5 | - | - | - |
| Ø4" Optics | ||||
| 2 Side Hole Adjusters | - | - | -K4F4 | - |
| Ø6" Optics | ||||
| 2 Side Hole Adjusters | - | - | -K6F4 | - |
| Table 103D Polaris XY Translation Mounts for Round Optics | ||
|---|---|---|
| Optic Retention Method | SM Threaded | Representative Photos |
| Ø1/2" Optics |   |
|
| 2 Hex Adjusters (X/Y) | -05CXY | |
| -05XY | ||
| 3 Adjuster Knobs (Tip/Tilt/Z) & 2 Hex Adjusters (X/Y) |
-K05XY | |
| Ø1" Optics | ||
| 2 Hex Adjusters (X/Y) | -1XY | |
| 3 Adjuster Knobs (Tip/Tilt/Z) & 2 Hex Adjusters (X/Y) |
-K1XY | |
| Ø1.5" Optics | ||
| 2 Hex Adjusters (X/Y) & 3 Adjuster Knobs (Tip/Tilt/Z) |
-K15XY | |
| Table 103E Polaris Fixed Mounts for Round Optics | ||||||
|---|---|---|---|---|---|---|
| Optic Retention Method | Side Lock | Low Distortion |
Glue-In | Representative Photos |
||
| Ø1/2" Optics |     |
|||||
| Optimized for Mirrors | - | -B05F | -C05G | |||
| Optimized for Beamsplitters | -B05S | - | -B05G | |||
| Optimized for Lenses | - | - | -L05G | |||
| Ø19 mm (Ø3/4") Optics | ||||||
| Optimized for Mirrors | -19S50/M | - | - | |||
| Ø1" Optics | ||||||
| Optimized for Mirrors | - | -B1F | -C1G | |||
| Optimized for Beamsplitters | -B1S | - | -B1G | |||
| Optimized for Lenses | - | - | -L1G | |||
| Ø2" Optics | ||||||
| Optimized for Mirrors | - | -B2F | -C2G | |||
| Optimized for Beamsplitters | -B2S | - | - | |||
| Table 103F Polaris Kinematic 1.8" x 1.8" Platform Mount | ||
|---|---|---|
| Optomech Retention Method | Tapped Holes & Counterbores |
 |
| 2 Adjuster Knobs | -K1M4(/M) | |
| Table 103G Accessories for Polaris Mounts | |
|---|---|
| Description | Representative Photos |
| Ø1/2" Posts for Polaris Mounts |  |
| Ø1" Posts for Polaris Mounts | |
| Non-Bridging Clamping Arms |  |
| 45° Mounting Adapter |  |
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Figure G1.1 POLARIS-K1T Mount Features 3 Removable-Knob Adjusters and POLARIS-K1T3 Features 3 Hex-Driven Adjusters
- 3-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1" Opticsa Up to 0.34" (8.6 mm) Thick or SM1-Threaded (1.035"-40) Components
- ±4° Mechanical Angular Range with ~7.7 mrad/rev Resolution
- Less than 1 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
The POLARIS-K1T and POLARIS-K1T3 Kinematic Mirror Mounts feature an SM1-threaded (1.035"-40) bore for mounting Ø1" optics up to 8.6 mm (0.34") thick or other products (see Figure G3.2). The three-adjuster design provides tip and tilt plus Z-axis (optical axis) adjustment. Two-adjuster versions are also available below.
The POLARIS-K1T includes three removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K1T3 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (Item # POLARIS-SM1RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle (see Figure G3.1). Standard DIN 7-m6 ground dowel pins are recommended; see the mechanical drawing for details by clicking on the Docs icon (
) below.
a. Please note that these mounts are designed for Ø1" optics and are not intended for use with the Ø25 mm metric mirror size.
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Figure G2.1 POLARIS-K1T1 Mount Features 2 Removable-Knob Adjusters and POLARIS-K1T2 Features 2 Hex-Driven Adjusters
- 2-Adjuster Knob- or Hex-Driven Design with 100 TPI Matched Actuator/Body Pairs
- Designed for use with Ø1" Opticsa Up to 0.34" (8.6 mm) Thick or SM1-Threaded (1.035"-40) Components
- ±4° Mechanical Angular Range with ~7.7 mrad/rev Resolution
- Less than 1 µrad Deviation after 12.5 °C Temperature Cycling (See Test Data Tab)
These 2-adjuster Ø1" Polaris Kinematic Mirror Mounts are similar to the standard 3-adjuster versions sold above but feature a hardened steel ball in place of the third adjuster. The 2-adjuster design improves mount stability by limiting the available degrees of freedom for movement. An SM1-threaded (1.035"-40) bore allows for mounting Ø1" optics up to 8.6 mm (0.34") thick or other SM1-threaded components.
The POLARIS-K1T1 includes two removable Ø0.60" (Ø15.2 mm) adjuster knobs, while the POLARIS-K1T2 is a hex-driven model. The adjusters on both mounts can be driven by a 5/64" (2 mm) hex key or the HKTS-5/64 hex key thumbscrew (sold below), and can be locked using our POLARIS-LN1 lock nut or POLARIS-LNS1 locking collar (sold separately below). For applications that require frequent tuning of the adjusters, the lock nut or locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below).
Two stainless steel retaining rings (included) are used to hold the mounted optic. Additional retaining rings (Item # POLARIS-SM1RR) can also be purchased separately. Post mounting is provided by two #8 (M4) counterbores which can be used with the included 8-32 and M4 cap screws. For custom mounting configurations, Ø2 mm alignment pin holes are located on both sides of each counterbore for setting a precise location and mounting angle (see Figure G4.1). Standard DIN 7-m6 ground dowel pins are recommended; see the Docs icon () below for details.
a. Please note that these mounts are designed for Ø1" optics and are not intended for use with the Ø25 mm metric mirror size.
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Figure 408A F25USK2 Knob Shown Attached to a POLARIS-K1E Mirror Mount
- Ø0.925" Knob for Additional Angular Resolution
- Clearance Hole Allows Access to Hex Socket of the Adjuster
This removable adjustment knob is compatible with many of our 1/4"-100 adjusters, including those used in the Ø1", Ø1.5", and Ø2" Polaris Kinematic Mounts and our Polaris Kinematic Platform Mount. The larger Ø0.925" size provides additional angular resolution over the standard Polaris knobs.
Please note that the F25USK2 knob is not compatible with Polaris mounts that use side-hole adjusters. The recessed bore of knob is not deep enough to allow the knob to engage the threads on the side-hole adjuster.
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- For Convenient Adjustment of 5/64" and 2 mm Hex-Driven Actuators
- Red Anodized Adjustment Knob with Engraved Hex Size
- Replaceable Hex Tip
- Sold in Packages of 4
These 5/64" Hex Key Adjuster Thumbscrews allow for quick adjustment of many 5/64" and 2 mm hex-driven actuators (or standard actuators with the knobs removed). These temporary knobs can be left in the screw's hex socket between adjustments for convenience (see Figure 206A). An 8-32 setscrew (5/64" hex) secures the replaceable hex bit, which can be reversed if the tip is stripped. Contact Tech Support to order replacement hex key bits.
We offer hex key thumbscrews in sizes from 0.050" to 3/16" and 2 mm to 5 mm.
ZoomVideo 591A To install a lock nut without cross threading, gently place the lock nut against the end of the adjuster. "Unscrew" the nut until the threads of the nut and the adjuster align before threading the nut onto the adjuster. This animation shows the installation of a POLARIS-LN1 lock nut on a
- Provides Long Term Adjuster Stability
- Compatible with Select Polaris Mounts
- 0.08" (1.9 mm) Thick
- 13 mm Hex Can Be Tightened with Thin-Head or Cone Wrench
This lock nut is compatible with Polaris mounts that have 1/4"-100 adjusters, excluding the piezo-driven mounts, mounts with low-profile adjusters (Item #s POLARIS-K1E3, and POLARIS-K1E2), and vertically driven mounts (Item #s POLARIS-K1VS2 and POLARIS-K1VS2L). Designed for long-term adjuster stability or applications that are exposed to shock and vibration, the lock nut is pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and has been tested for adjuster fit.
For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened by hand to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below). POLARIS-LN1 lock nuts have a 13 mm hex. To avoid cross threading the lock nut, place it against the adjuster and "unscrew" the lock nut until you feel a slight drop; then thread the lock nut onto the adjuster.
Zoom- Provides Long-Term Adjuster Stability
- Compatible with Select Polaris Mounts
- Low Profile: Ø0.33" (Ø8.4 mm) x 0.08" (1.9 mm) Thick
- Tighten Along Rotational Axis Using the POLARIS-T2 Spanner Wrench
This locking collar is compatible with Polaris mounts that have 1/4"-100 adjusters, excluding the piezo-driven mounts and mounts with low-profile adjusters. Designed for long-term adjuster stability or applications that are exposed to shock and vibration, these locking collars are pre-greased with the same ultra-high-vacuum-compatible, low-outgassing PTFE grease as the Polaris mounts and have been tested for adjuster fit.
The POLARIS-T2 spanner wrench has been specifically designed for use in securing the POLARIS-LNS1 locking collar. The double spanner head enables complete engagement while the design allows locking collar adjustments to be along the same line as the adjuster itself. A center through hole allows a 2 mm ball driver to pass through the spanner wrench, so that the adjuster can be held in position while the locking collar is engaged.
For applications that require frequent tuning of the adjusters, the locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long-term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench (sold below) in combination with the POLARIS-T2 spanner wrench. To avoid cross threading the locking collar, place it against the adjuster and "unscrew" the collar until you feel a slight drop; then thread the collar onto the adjuster.
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Figure 714A The TW13 wrench is engraved with its preset torque value and Item #.
Click for Details
Figure 714B TW13 Torque Wrench Used to Secure POLARIS-LN1 Lock Nut on POLARIS-K2S2 Mirror Mount
- 13 mm Hex and Preset Torque Value of 32 oz-in (0.23 N•m) (See Table 714C for Compatibility)
- Break-Over Design Ensures Proper Torque is Applied
- Ideal for Applications Requiring Long-Term Locking
The TW13 torque wrench has a preset torque value of 32 oz-in for use with the lock nuts and spanner wrenches listed in Table 714C. When the preset torque value has been achieved, the break-over design will cause the pivoting joint to "break," as shown in Figure 714B. The wrench's hex head will move back into place once the force is removed. This design prevents further force from being applied to the lock nut. Engraved guidelines indicate the angle the wrench should pivot in order to apply the specified torque; pivoting the handle past these guidelines will over-torque the lock nut. The wrench is also engraved with its preset torque value, torque direction, wrench size, and item # for easy identification in the field.
This wrench is designed to be compatible with cleanroom and vacuum chamber applications. It is chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, it is assembled in a clean environment and double vacuum bagged to eliminate contamination when transported into a cleanroom. The wrench has a bead blasted finish to minimize reflections when working with setups that include lasers.
Please note that these wrenches are not intended for use in applications where adjusters are frequently tuned, as these applications typically require torque values of 4 to 8 oz-in (0.03 to 0.06 N·m).
| Table 714C Compatibility | ||||
|---|---|---|---|---|
| Item # | Hex | Torque | Torque Accuracy | Compatible Items |
| TW13 | 13 mm | 32 oz-in (0.23 N•m) | ±1.92 oz-in (0.014 N•m) | POLARIS-LN1 1/4"-100 Lock Nut POLARIS-LN4 3/8"-100 Lock Nut POLARIS-T2 Spanner Wrench for POLARIS-LNS1 Locking Collar POLARIS-T3 Spanner Wrench for POLARIS-LNS05 Locking Collar |
 Ø1" SM1-Threaded Mounts, SS |