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Ø1" (Ø25 mm) Posts for Polaris® Mirror Mounts


  • Top-Located 8-32 (M4) Taps and Bottom-Located 1/4"-20 (M6) Tap
  • Heat-Treated, Stainless Steel Construction
  • Precision Ø6 mm Bore for Angle Tuning and Alignment

PLS-P1

One 8-32 Tap, L = 1.0"

PLS-T2

Three 8-32 Taps, L = 2.0"

PLS-P373/M

One M4 Tap, L = 37.3 mm

L

2.0"

Ø1/2" Polaris Mirror Mount Mounted on a PLS-P150 Post that is Held with a POLARIS-CA1 Clamping Arm

2 mm Alignment Pin Holes Around Tap Locations

Related Items


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Key Featuresa
Item # Post Length (L) Mounting Taps
PLS-P1 1.00" One 8-32
One 1/4"-20
PLS-P150 1.50"
PLS-P246/M 24.6 mm One M4
One M6
PLS-P373/M 37.3 mm
PLS-T1 1.00" Three 8-32
One 1/4"-20
PLS-T2 2.00"
PLS-T242/M 24.2 mm Three M4
One M6
PLS-T492/M 49.2 mm
  • Each post is designed to raise the optical axis to a specific height when used with a certain Polaris mirror mount. See the tables below for the resulting optic axis heights.
Post Deflection
Click to Enlarge

A PLS-P150 Post was mounted at various heights off of the work surface using a POLARIS-CA1 Clamping Arm. A force, perpendicular to the post axis, was applied to the post and the overall deflection was measured directly after the force was removed. These deflection values show that the posts should not be mounted higher than 7 mm off the working surface with the POLARIS-CA1. See the Mounting Arm tab for more details on our post deflection test.

Features

  • Ø1" or Ø25 mm Nonmagnetic, Stainless Steel Construction
  • Posts with One or Three Top-Located 8-32 (M4) Taps
  • One Bottom-Located 1/4"-20 (M6) Tap
  • Two Ø2 mm Alignment Pin Holes on Each End for Precision Mounting (Dowel Pins Not Included)
  • Vacuum Compatible to 10-9 Torr at 25 °C with Proper Bake Out
  • Heat-Treated Steel Removes Internal Stresses for Increased System Stability
  • Large-Diameter Relief Cut on Top and Bottom for Additional Mounting Stability
  • Configurator Available for Custom Lengths, Taps, and Usage Features

These posts are designed to raise the optic center of our Ø1/2", Ø1", and Ø3" Polaris® mirror mounts to standard optic axis heights. Each post contains one or three top-located 8-32 (M4) taps and a bottom-located 1/4”-20 (M6) tap. These threading choices eliminate the need for a thread adapter, as the mirror mount can be directly attached to the post. Consequently, these posts provide a one-piece post solution, thereby reducing the instability created when using multiple optomechanical components. Please see the Mounting Stability tab for details.

Created with OEM and custom systems in mind, two Ø2 mm alignment pin holes are located around each tap, which will allow for DIN-7-m6 ground dowel pins (not included) to be used. Securing posts and accessories within a system using dowel pins prevents them coming loose due to vibrations, shipping, or incidental contact.

The posts are made from heat-treated stainless steel, which has a relatively low coefficient of thermal expansion (CTE) and matches the material used in all of our Polaris mirror mounts, clamping arms, and 45° adapters. Matching the CTE of materials within an optical setup is essential to achieve optimal thermal repeatability. Heat treating the materials removes the internal stresses that can cause temperature-dependent hysteresis. Therefore, we only recommend using components fabricated from the same material.

Alignment Bore
A Ø6 mm alignment bore is located 20 mm from the base and is drilled towards the vertical center line of the post. Strategically located so that it will not be covered when these posts are secured with a POLARIS-CA1 or POLARIS-CA25/M Clamping Arm, this bore can be used in combination with our cage rods for the alignment of multiple mounts along a common optical axis or for fine angle tuning.

Mounting Options
We recommend two methods for securely mounting these posts. The first option, primarily for OEM or custom systems, is to attach the post directly to a custom mounting platform via a counterbored hole for a 1/4"-20 (M6) cap screw and two holes for dowel pins. For details, please see the Custom/OEM Systems tab.

Volume Pricing Discount

OEM Solutions and Volume Orders

Thorlabs manufactures custom and high-volume Polaris® products for use in custom and OEM systems. See our custom configurator below for our custom post options. High-volume discounts are built into the configurator, with a minimum order size of 26 posts required to recieve the discount.

For pricing information on high-volume orders of our standard posts, please contact Technical Support.

The second recommended option is to use our POLARIS-CA1 or POLARIS-CA25/M Clamping Arm. Extensive testing has been conducted to show the performance of these posts when they are mounted with a Polaris clamping arm, as shown in the plot to the right. For complete details on all of the testing done, please see the Mounting Arm tab.

Cleanroom and Vacuum Compatibility
These posts are designed to be compatible with cleanroom and vacuum 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 double vacuum bagged to eliminate contamination when transported into a cleanroom. Please contact Tech Support for details.


Click for Details

Our posts for Polaris® mounts include a top-located 8-32 (M4) tap so that a thread adapter is not needed for attaching mirror mounts. This removes the risk of creating a false mounting surface (see Figure 1) or having partial thread engagement (see Figure 2).

Mounting Stability

These posts incorporate a top-located 8-32 (M4) tap and a bottom-located 1/4"-20 (M6) tap. The use of an 8-32 (M4) tap allows any mirror mount with a #8 (M4) clearance hole to be directly attached to the post without the need for a thread adapter. Since the addition of a thread adapter can create a false mounting surface (see Figure 1) or a partial thread engagement (See Figure 2), removing the need for one is crucial when stability is of utmost importance. The addition of alignment pin holes around each mounting tap allows for mounts to be pre-aligned before attachment to the post, as shown in the photo to the right. They also prevent unwanted rotation or movement when securing a mount to the post, during shipping, or when the post is accidentally contacted. 

Polaris Post Mounting
Click to Enlarge

Figure 1: A thread adapter, highlighted in blue above, is shown creating a false mounting surface, which can cause the mounted component to lean to the side and be more vibrationally sensitive.
Polaris Post Mounting
Click to Enlarge

Figure 2: A thread adapter, highlighted in blue above, is shown reducing the amount of thread engagement between the mounting screw and post tap.
Custom OEM System
Click for Details

A custom base plate is used to align various Polaris mounts and posts. Click to view the top and bottom of the base plate and how the items were pre-aligned.

Mounting Within a Custom or OEM System

Every standard post designed for a Polaris® mirror mount includes two Ø2 mm alignment pin holes around each tap. When used with dowel pins (not included), these pin holes allow for precision mounting in custom or OEM systems while also preventing mounted components from coming loose due to vibrations, shipping, or incidental contact.

When constructing a custom base plate, the holes for the dowel pins should be deep enough so that the dowel pin sits at 0.05" ±0.005" (1.27 mm ±0.13 mm) above the surface of the base plate. The center-to-center distance between the two dowel pin holes should be 0.394" (10.0 mm), while the center of the 1/4" through hole is 0.197" (5.0 mm) from the center of each dowel pin hole. The recommended tolerance for the location of the dowel pin holes and mounting hole is ±0.005". Please see the mechanical drawing below for more details.


Click to Enlarge
We recommend that any custom base plate created for our Polaris posts or mirror mounts use the above specifications. The drawing provides all center-to-center distances needed with the necessary tolerances. It also shows the ideal distance that the dowel pin (not included) should extrude from the mounting surface.

POLARIS-CA1 Clamping Arm Testing

Various tests were performed to show the performance of our POLARIS-CA1 Clamping Arm. All of the tests conducted below are done with a clamping arm, a post designed for Polaris® mirror mounts, and a Polaris mirror mount. Many of the results were then compared to other industry-standard products that were put to the same test to show the high-quality performance of a system constructed from Polaris products. Click the links below for more information about a specific test. Please note that 75 in-lb is the typical amount of torque recommended to secure a 1/4"-20 (M6) screw.

  • Laser Platform Deformation
    • Determine the extent to which an industry-standard clamping fork deforms or permanently damages a stainless steel rigid platform and whether or not the POLARIS-CA1(/M) improves upon or prevents this damage.
  • Post and Platform Mounting Torque
    • Determine the ideal amount of clamping torque necessary to (1) securely mount a Ø1" PLS-P150 Post within the flexure clamp bore of the POLARIS-CA1(/M) clamping arm, and (2) to secure the clamping arm into a laser system.
  • Post Breaking Torque
    • Determine the amount of toque needed to break a Ø1" PLS-P150 Post loose from the POLARIS-CA1 Clamping Arm that was holding it.
  • Post Deflection
    • Determine how much a Polaris post will temporarily and permanently deflect when it is mounted within the POLARIS-CA1(/M) Clamping Arm and a force is applied.

 

Optic Distortion as a Result of Torque
Click to Enlarge

Figure 1: The industry-standard fork did not return the beam to its original position; instead, beam stayed at a yaw and pitch deviation of 176 µrad and 321 µrad, respectively, thus proving that the industry-standard clamping fork permanently deformed the mounting surface.

Laser Platform Deformation

Purpose: This testing was performed to determine the extent to which an industry-standard clamping fork deforms or permanently damages a stainless steel rigid platform and whether or not the POLARIS-CA1(/M) Clamping Arm improves upon or prevents this damage. These measurements show that this clamping arm option significantly reduces temporary deformation to the surface and that no permanent damage was measured during our extensive tests.

Procedure: An industry-standard clamping fork was mounted in close proximity to another optical element that was used for aligning a beam onto a position detector. As the clamping fork was mounted to the platform at various torque values (blue data sets in Figures 1 and 2), the yaw and pitch deviation of the beam was measured at the detector. At 75 in-lbs of torque the fork was left attached to the platform for 16 hours. After the 16 hour period, the fork was released from the table and the final beam deviation was recorded (red data sets in Figure 1 and Figure 2). This procedure was repeated for the POLARIS-CA1 Clamping Arm. Each test was performed at different regions of the platform. If the final deviation is anything but zero, then the surface has been permanently deformed.

Results: As can be seen in the plots below and to the right, the industry-standard clamping fork created a yaw and pitch deviation of 131 µrad and 702 µrad, respectively, at 75 in-lbs, while the POLARIS-CA1 Clamping Arm created a yaw and pitch deviation of 12.2 µrad and 61 µrad, respectively, at 75 in-lbs. The POLARIS-CA1 also returned the beam to its initial position when released after a 16 hour hold. The industry-standard clamping fork did not return the beam to its original position; instead, the beam stayed at a yaw and pitch deviation of 176 µrad and 321 µrad, respectively. The simulaton results shown in Figures 3 and 4 show the amount of deformation created by an industry-standard clamping fork compared to the POLARIS-CA1 clamping arm.

Conclusion: The POLARIS-CA1 Clamping Arm caused no permanent damage to the optical mounting surface, and it significantly minimized the deformation to the platform surface when it was in use (see Figures 3 and 4). In contrast, the industry-standard clamping fork was shown to permanently damage the laser platform after use, and to create severe deformation to the surface while in use. As a result, the Polaris clamping arm is ideal for use in systems requiring long-term stability and consistent, precision alignments.

Optic Distortion as a Result of Torque
Click to Enlarge

Figure 2: Note that the distortion caused by the Polaris clamping arm at 75 in-lb is comparable to the distortion caused by the industry-standard clamping fork at 10 in-lb. Once the torque was removed the beam went back to its original position. This shows that the Polaris clamping arm caused no permanent damage to the mounting surface.
Polaris Table Distortion
Click to Enlarge

Figure 4: The POLARIS-CA1 clamping arm causes minimal deformations around the fork. Note that the scale on this plot has been magnified by 10X when compared to Figure 3 in order to make these minimal deformations visible.
Fork Table Distortion
Click to Enlarge

Figure 3: The industry-standard clamping fork causes large deformations over a significant area surrounding the fork.

 

Mounting Torque

Purpose: This testing was performed to determine the ideal amount of clamping torque necessary to (1) securely mount a Ø1" post within the flexure clamp bore of the POLARIS-CA1(/M) clamping arm, and (2) to secure the clamping arm into a laser system. This data was then compared to the closest competitor's industry-standard clamping fork design. Please note that the design of the industry standard clamping fork depends on the force created when mounting it to a work surface to also secure a pedestal post; in contrast, the Polaris clamping arm incorperates a seperate flexure clamping mechanism to secure a non-pedestal post.

Procedure: The POLARIS-CA1(/M) Clamping Arm was used to hold a Ø1" post designed for Polaris mirror mounts. The clamping arm was first bolted to the stainless steel work surface and the flexure clamp was actuated, using the side-located 1/4"-20 (M6) cap screw, to specific torque values. At each specific torque value of the flexure clamp, the post had a rotational torque applied around its axis until it moved within the fork's bore. The torque value at the moment directly before this "movement point" is called the holding torque (see plots below). This test was stopped after reaching 110 in-lbs of holding torque as this is enough torque to damage the threading on a 1/4"-20 (M6) screw. A similar test was then applied to find the ideal torque needed to secure the clamping arm to the work surface.

Results for Test 1: As can be seen in Figure 6 below, the POLARIS-CA1(/M) flexure clamp displays 110 in-lbs of holding torque when 20 in-lbs of clamping torque is applied to the flexure clamp. For reference, 110 in-lbs of torque is enough to damage the threading on a 1/4"-20 stainless steel cap screw. Looking at the competitors design, which requires the use of the slot mount to hold the post, it can be seen (see Figure 9) that the same clamping torque of 20 in-lbs results in a holding torque of only 20 in-lbs when the cap screw is secured in the mid position. The corresponding torque for the POLARIS-CA1/M is a holding torque of 12.4 N•m at a clamping torque of 2.4 N•m. The scales for these measurements, as seen in Figures 6 and 8 below, are not a direct conversion due to an efficiency difference between a 1/4"-20 and M6 screw. The efficiency of an M6 screw is about 5% less than that of a 1/4"-20 screw due to differences in diameter and pitch.

Results for Test 2: The recommended clamping torque for the mounting slot (Figure 8) varies depending upon the position where a 1/4"-20 (M6) cap screw is secured into the slot (i.e., close to the post, midway along the slot, or far from the post). Note how the performance of the POLARIS-CA1(/M) clamping arm (see Figure 8) does not change significantly from a close to far cap screw position, while the performance of the closest competitor's clamping fork (see Figure 9) is extremely dependent on the position where the 1/4"-20 (M6) cap screw is secured within the slot. The performance of the fork degrades sharply at the mid and far positions, as seen in Figure 9. At the far position, the best holding torque achieved is 32 in-lb with a clamping force of 70 in-lb. This compares to the Polaris clamping arm's best holding torque (see Figure 8) of 110 in-lbs with a clamping force of only 60 in-lbs at the far position. For a quick comparison of the achievable mid-slot position holding torques for the Polaris clamping arm and the competitors clamping fork, please see Figure 10.

Conclusion: The POLARIS-CA1(/M) was shown to be the ideal solution for securely mounting a component to a laser system platform. At only 20 in-lb and 40 in-lb of clamping torque for the flexure clamp and slot mounting, respectively, the post mounted in a POLARIS-CA1 can withstand up to 110 in-lb of opposing torque (corresponding torques for the POLARIS-CA1/M are 2.4, 4.8, and 12.4 N•m, respectively). This performance is superior to the closest competitor's industry-standard clamping fork, which needs a clamping force of 70 in-lb in the close position to reach a similar value of 100 in-lb. Minimizing the amount of torque applied to the mounting surface prevents permanent damage. 

Test 1: Flexure Clamp Holding Torque

Competitors Mounting Torque
Click to Enlarge

Figure 5: Holding torque is defined as the moment directly before the "movement point" of the post being torqued (see the plot to the right).
POLARIS-CA1 Mounting Torque
Click to Enlarge

Click for POLARIS-CA1/M Flexure Clamp Holding Torque Results
Figure 6: Results from Test 1. The blue shaded region indicates the recommended flexure clamp torque. This shows that the Polaris clamping arm has a higher holding torque than the industry-standard clamping fork's holding torque
(measured in test 2).

Test 2: Slot Mounting Holding Torque

Competitors Mounting Torque
Click to Enlarge

Figure 7: Holding torque is defined as the moment directly before the "movement point" of the clamping arm being torqued (see the plot to the right).
POLARIS-CA1 Mounting Torque
Click to Enlarge

Click for POLARIS-CA1/M Slot Holding Torque Results
Figure 8: Results from Test 2. The red shaded region indicates the recommended torque to secure the clamping arm to the optical table. This shows that the Polaris clamping arm has a higher slot holding torque than the industry-standard clamping fork's slot holding torque (shown below).
Competitors Mounting Torque
Click to Enlarge

Figure 9: Results from Test 2 on a competitor's clamping fork. See Figure 8 above for results from POLARIS-CA1(/M).
Competitors Mounting Torque
Click to Enlarge

Figure 10: Comparison of Test 2 results for POLARIS-CA1 and a competitor's clamping fork, both at the middle position in the mounting slot.

 

Optic Distortion as a Result of Torque
Click to Enlarge

Figure 12: Breaking force recorded with the post mounted at 14 different heights above the platform. This shows that upwards of 130 N•m of torque is required to loosen the PLS-P150 Post from the clamping arm when it is mounted directly to the work surface. 
Competitors Mounting Torque
Click to Enlarge

Figure 11: Breaking torque is defined as the moment directly after the "movement point" of the post being torqued.

Breaking Torque

Purpose: This testing was performed to determine the amount of torque needed to break a Ø1" PLS-P150 Post loose from the
POLARIS-CA1 Clamping Arm.

This test was repeated at various heights above the work surface.

Procedure: A PLS-P150 1.5" long, Ø1" Post was secured with 25 in-lb of torque at various heights within a POLARIS-CA1 Clamping Arm, which was then secured to a custom laser platform. As shown in Figure 11, torque was then applied to the post axis until the post moved or reached its "movement point." This torque was recorded as the breaking force.

Results: As can be seen in Figure 12, upwards of 110 N•m of torque is required to loosen the PLS-P150 post from the clamping arm. When the post was raised off of the platform by 13 mm, a torque of about 40 N•m was still required to loosen the post. It is important to note here that the clamping arm is only 15.2 mm (0.60") thick.

Conclusion: The PLS-P150 Post and POLARIS-CA1 Clamping Arm create an extremly stable system that is resistant to large forces acting upon it, even when holding a post that is raised off of the platform by 13 mm. This is ideal for any custom or OEM system that requires components to stay aligned when faced with vibrations caused by shipping and installation.

 

Post Deflection


Click to Enlarge
Figure 13: A force was applied to the PLS-P150 Post 0.90" (22.9 mm) above the edge of the clamping arm at nine different post heights off of the mounting surface. The overall deflection was then measured at each height during and after the applied force.

Purpose: This testing was performed to determine how much a Ø1" post designed for use with Polaris mirror mounts will temporarily and permanently deflect when it is mounted within the POLARIS-CA1(/M) Clamping Arm and a force is applied.

Procedure: A PLS-P150 1.5" long, Ø1" Post was secured with 25 in-lb of torque at various heights within a POLARIS-CA1 Clamping Arm, which was then secured to a custom laser platform. A force was then applied to the center of the post, 0.90" (22.9 mm) above the top edge of the clamping arm (see Figure 13 for details). This test was conducted with the post mounted at nine different heights off of the platform, ranging from 0 mm to 8 mm. The amount of deflection was measured while the force was being applied (Figure 14) and after the force was removed (Figure 15).

Results: Figure 14 shows that the PLS-P150 Post will deflect by <0.01 mm as a force of ≤40 N is applied at any post height ≤8 mm, and by <0.17 mm as a force of ≤133 N is applied at any post height ≤8 mm. These values show the temporary deflection of the post while the force is being applied. Figure 15 shows that the PLS-P150 Post was permanently deflected by <0.005 mm after a force of ≤35 N was applied at any post height ≤8 mm, and by <0.07 mm when a force of ≤133 N is applied at any post height ≤8 mm. These values show the permanent deflection of the post directly after the force was applied. It is important to note that no permanent deflection was measured between heights of 0 mm to 2 mm after a force of 45 N was applied.

Conclusion: Our Ø1" Posts and POLARIS-CA1 Clamping arm create an extremly stable system that is able to resist large forces acting upon it. This is ideal for any custom or OEM system that requires components to stay aligned when faced with vibrations caused by shipping and installation.

Post Deflection
Click to Enlarge

Figure 15: Post deflection measured at specific heights off of the laser platform directly after the applied force was removed from the post. This shows that the PLS-P150 Post was permanently deflected by <0.005 mm after a force of ≤35 N was applied at any
post height ≤8 mm.
Polaris Table Distortion
Click to Enlarge

Figure 14: Post deflection measured at specific heights off of the laser platform while force was being applied to the post. This shows that the PLS-P150 Post will deflect by <0.01 mm as a force of ≤40 N is applied at any post height ≤8 mm.

Posted Comments:
Emily Qin  (posted 2019-06-11 11:23:56.273)
please add compatible location pins for this family. thanks
llamb  (posted 2019-06-14 12:30:22.0)
Thank you for your feedback. We will look into adding compatible dowel pins further.
cbrideau  (posted 2017-03-08 17:37:47.157)
What are the specifications for the dowel pins for using them with Polaris mirror mounts? I see they are 2mm dia, but what length is best?
jlow  (posted 2017-03-09 09:04:02.0)
Response from Jeremy at Thorlabs: The recommended length is 5mm.
Polaris Mount Optic Retention Methods (Click Image to Enlarge)
Side Lock SM Threaded Low Distortion Glue In
Polaris Mount Adjuster Types (Click Image for Details)
Side Hole Hex Adjuster Knobs Adjuster
Lock Nuts
Piezo Adjusters

Thorlabs offers several different general varieties of Polaris mounts, including kinematic side optic retention, SM-threaded, low optic distortion, piezo-actuated, and glue-in optic mounts, as well as a fixed monolithic mirror mount and fixed optic mounts. Click to expand the tables below and see our complete line of Polaris mounts, listed by optic bore size, and then arranged by optic retention method and adjuster type. We also offer a line of accessories that have been specifically designed for use with our Polaris mounts; these are listed in the table immediately below.

If your application requires a mirror mount design that is not available below, please contact Tech Support.

Polaris Mounts for Ø1/2" Optics 

Polaris Mounts for Ø19 mm (3/4") Optics

Polaris Mounts for Ø25 mm Optics

Polaris Mounts for Ø1" Optics

Polaris Mounts for Ø1.5" Optics

Polaris Mounts for Ø50 mm Optics

Polaris Mounts for Ø2" Optics

Polaris Mounts for Ø3" Optics

Polaris Kinematic Platform Mount

Ø1" (Ø25 mm) Posts for Polaris® Mirror Mounts, One Mounting Tap


Click for Details

A top-located 8-32 (M4) tap allows for the direct mounting of a Polaris mount without the need for a thread adapter. Dowel pins (not included) provide precision mounting.
  • Designed to Raise Ø1/2" and Ø1" Polaris Mounts to Standard Optic Axis Heights
  • One Top-Located 8-32 (M4) Tap
  • One Bottom-Located 1/4"-20 (M6) Tap
  • Two Ø2 mm Alignment Pin Holes Around Each Tap for Precision Mounting (Dowel Pins Not Included)

These posts feature one 8-32 (M4) mounting tap on the top surface. They are designed to mount Polaris mirror mounts up to Ø2"; see the table below for the resulting optic axis heights when used with each mount size. Each end of the post has two Ø2 mm alignment pin holes on either side of the mounting tap. Dowel pins are not included.

A Ø6 mm alignment bore is located 20 mm from the base and can be used in combination with our cage rods for the alignment of multiple mounts along a common optical axis or for fine angle tuning. Note that the alignment bore does not go completely through the PLS-P1 and PLS-P246/M posts. Instead, these posts contain two bores on opposite sides, within ±0.3°, that are 0.20" (5.1 mm) deep. Given their shorter length, a through bore would interfere with the mounting threads, preventing anything from being securely attached to the post. In the custom post configurator below, any post with a length of 1.49" (37.6 mm for metric posts) or less will have a similar alignment bore configuration.

Polaris® Mount and Post Interoperabilitya
Item # Post
Length
(L)
Resulting Optical Axis Height (Optic Center)
Ø1/2" Mountsb Ø19 mm Mounts and
Ø1" Fixed Mounts
Ø1" Kinematic
Mounts
Ø2" Mounts
PLS-P1 1.00" 1.50" 1.75" 2.00" 2.40"
PLS-P150 1.50" 2.00" 2.25" 2.50" 2.90"
PLS-P246/M 24.6 mm 37.3 mm 43.7 mm 50.0 mm 60.2 mm
PLS-P373/M 37.3 mm 50.0 mm 56.4 mm 62.7 mm 72.9 mm
  • Green Shaded Cells Denote Standard Optical Axis Heights
  • The POLARIS-K05P2 1/2" Mirror Mount with Piezo Adjusters has a non-standard base-to-optic center distance of 0.62" (15.7 mm) as shown here. Therefore, the resulting optical axis height, or optic center, will be 0.12" (3.0 mm) higher than what is quoted above.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PLS-P1 Support Documentation
PLS-P1Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.00"
$31.26
Today
PLS-P150 Support Documentation
PLS-P150Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.50"
$32.31
Today
+1 Qty Docs Part Number - Metric Price Available
PLS-P246/M Support Documentation
PLS-P246/MØ25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 24.6 mm
$31.26
Today
PLS-P373/M Support Documentation
PLS-P373/MØ25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 37.3 mm
$32.31
Today

Ø1" (Ø25 mm) Posts for Polaris® Mirror Mounts, Three Mounting Taps


Click to Enlarge

View Imperial Product List
Item #QtyDescription
POLARIS-K3S51Polaris® Ø3" Mirror Mount, 3 Adjusters with Side Holes
PF30-03-P011Ø3" Protected Silver Mirror
POLARIS-N33Removable Knob for 5/16"-100 Adjusters, Qty. 1
POLARIS-LN335/16"-100 Lock Nut, 18 mm Hex, Stainless Steel
PLS-T21Ø1" Post for Polaris Mirror Mounts, Three 8-32 Taps, L = 2.00"
POLARIS-CA11Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw

View Metric Product List
Item #QtyDescription
POLARIS-K3S51Polaris® Ø3" Mirror Mount, 3 Adjusters with Side Holes
PF30-03-P011Ø3" Protected Silver Mirror
POLARIS-N33Removable Knob for 5/16"-100 Adjusters, Qty. 1
POLARIS-LN315/16"-100 Lock Nut, 18 mm Hex, Stainless Steel
PLS-T492/M1Ø1" Post for Polaris Mirror Mounts, Three M4 Taps, L = 49.2 mm
POLARIS-CA25/M1Flexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw

The three tapped holes on these posts line up with the counterbores on Ø2" and Ø3" Polaris mirror mounts.
  • Designed to Raise Ø3" Polaris Mounts to Standard Optic Axis Heights
  • Three Top-Located 8-32 (M4) Taps
  • One Bottom-Located 1/4"-20 (M6) Tap
  • Two Ø2 mm Alignment Pin Holes on Each End for Precision Mounting (Dowel Pins Not Included)

These posts feature three 8-32 (M4) mounting taps on the top surface. They are designed to mount Ø2" and Ø3" Polaris mirror mounts, which have two and three #8 (M4) counterbores at each mounting face, respectively. This allows these large mirror mounts to be used on a post without sacrificing stability. Each end of the post has two Ø2 mm alignment pin holes on either side of the mounting tap; on the top surface, the alignment pin holes are located on either side of center tap.

A Ø6 mm alignment bore is located 20 mm from the base and can be used in combination with our cage rods for the alignment of multiple mounts along a common optical axis or for fine angle tuning. Note that the alignment bore does not go completely through the PLS-T1 and PLS-T242/M posts. Instead, these posts contain two bores on opposite sides, within ±0.3°, that are 0.20" (5.1 mm) deep. Given their shorter length, a through bore would interfere with the mounting threads, preventing anything from being securely attached to the post. In the custom post configurator below, any post with a length of 1.49" (37.6 mm for metric posts) or less will have a similar alignment bore configuration.

Posts with three 8-32 (M4) taps cannot currently be made using the custom post configurator below. For a custom size of our posts with three mounting taps, please contact Tech Support.

Polaris® Mount and Post Interoperabilitya
Item # Post Length (L) Resulting Optical Axis Height (Optic Center)
Ø2" Mounts Ø3" Mounts
PLS-T1 1.00" 2.40" 3.00"
PLS-T2 2.00" 3.40" 4.00"
PLS-T242/M 24.2 mm 59.8 mm 75.0 mm
PLS-T492/M 49.2 mm 84.8 mm 100.0 mm
  • Green Shaded Cells Denote Standard Optical Axis Heights
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PLS-T1 Support Documentation
PLS-T1Ø1" Post for Polaris Mirror Mounts, Three 8-32 Taps, L = 1.00"
$41.10
Today
PLS-T2 Support Documentation
PLS-T2Ø1" Post for Polaris Mirror Mounts, Three 8-32 Taps, L = 2.00"
$44.55
Lead Time
+1 Qty Docs Part Number - Metric Price Available
PLS-T242/M Support Documentation
PLS-T242/MØ25 mm Post for Polaris Mirror Mounts, Three M4 Taps, L = 24.2 mm
$41.10
Today
PLS-T492/M Support Documentation
PLS-T492/MØ25 mm Post for Polaris Mirror Mounts, Three M4 Taps, L = 49.2 mm
$44.55
Today

Build Your Polaris Mounting Post
Enter Post Height [a]:
Metric   Imperial
  mm

Top Mounting Included: M4


Top Dowel Pin Holes:
None   Ø2 mm Dowel Pins on a 10 mm Pitch

Bottom Mounting Option:
None   M6

Bottom Dowel Pin Holes:
None   Ø2 mm Dowel Pins on a 10 mm Pitch

Include Ø6 mm Alignment Hole [b]:
No   Standard 20 mm Height

Alignment Hole Angle:
°
Your Configuration [c]

Top

Bottom
Engraved Text:
PLS-P500H0000A00

Reordering?
Enter the engraving
found on your post:

PLS-P


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Quantity:   




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Footnotes
a) The post height must be between 0.5" (12.7 mm) and 6.0" (152.4 mm). Allowable precision is hundredth for inches and tenths for mm. If an imperial height is chosen the post diameter will be 1.00" (25.4 mm) and if a metric height is chosen the post diameter will be 25.0 mm (0.98"). Contact techsupport@thorlabs.com if a different configuration is required.
b) Not available for post heights less than 1" or 24.6 mm. For heights less than 1.5" or 37.3 mm, the alignment hole will be 0.2" (5.08 mm) deep instead of a thru hole.
c) Dimensions Are Not to Scale
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