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Polaris® Fixed Optic Mounts


  • Monolithic Design for Minimal Optic Distortion
  • Heat Treating Minimizes Temperature-Dependent Hysteresis
  • Versions Optimized for Lenses, Mirrors, and Beamsplitters
  • Glue-In or Flexure-Clamp Versions Available

POLARIS-L1G

Ø1" Glue-In Mount
Optimized for Lenses

POLARIS-C05G

Ø1/2" Glue-In Mount
Optimized for Mirrors

POLARIS-C1G

Ø1" Glue-In Mount Optimized for Mirrors (Mirror and Post Not Included)

POLARIS-B1S

Ø1" Flexure-Clamp Mount
 Optimized for Beamsplitters

POLARIS-C2G

Ø2" Glue-In Mount Optimized for Mirrors

Related Items


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The three Polaris glue-in fixed mount designs: optimized for beamsplitters (left), optimized for lenses (middle), and optimized for mirrors (right). The Ø1" versions are shown here.

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Polaris Flexure-Clamp Fixed Mount Optimized for Beamsplitters (Ø1" Version Shown Here)

Features

  • Machined from Heat-Treated Stainless Steel with Low Coefficient of Thermal Expansion (CTE)
  • Three Fixed Mount Styles for Ø1/2", Ø1", or Ø2" Optics
    • Lens-Optimized with Coarse Focus Adjustment
    • Mirror-Optimized with Clear Edge
    • Beamsplitter-Optimized with Increased Transmissive Clear Aperture
  • Glue-In and Flexure-Clamp Optic Mount Designs for Minimal Optic Distortion
  • Extensive Testing Guarantees <2 μrad Deviation After 12.5 °C Temperature Cycling (See the Test Data Tab for Details)
  • Passivated Stainless Steel Surface Ideal for Vacuum and High-Power Laser Cavity Applications

Polaris® Fixed Optic Mounts are the ultimate solution for applications requiring stringent long-term alignment stability.

Fixed mounts for plano or curved, Ø1/2", Ø1", or Ø2" optics are available below. The mounts are offered in three styles, each optimized for a different type of optic: lenses, mirrors, or beamsplitters.

Optic Mounting
Polaris Glue-In Optic Mounts feature a mounting cell in which an optic can be permanently affixed with an optical adhesive (available below). This mounting technique results in significantly less optical surface distortion than traditional methods based on setscrews or flexure mechanisms. See the Glue-In Tutorial tab for more information on installing optics in the glue-in mounts. The glue-in mounts on this page can be used with metric-sized optics; however, the optic locating points will not center the optic, requiring the centration to be adjusted by hand during installation. The mounts should not be used with optics that have an outer diameter tolerance greater than zero.

Mounts for OEMs

Thorlabs' Polaris Fixed Optic Mounts were designed to meet the needs of OEM customers. To that end, we are equipped to manufacture these mounts in high volumes and with timed delivery. Additionally, we can design and manufacture modified versions of these mounts for mounting additional optic types, sizes, and shapes. For example, we have produced similar fixed mounts for square mirrors, diffraction gratings, different optic sizes, or different beam heights. To find out more about our OEM capabilities, please contact Tech Support.

Polaris Flexure-Clamp Optic Mounts provide highly stable mounting without permanently affixing the optic. A monolithic stainless steel flexure clamp and setscrew combination provides temperature-independent retention of the optic with maximum stability and low wavefront distortion. The mounts are designed for optics with imperial diameters; performance will be diminished if these mounts are used with optics with metric diameters. For custom mounts sized for metric optics, please contact Tech Support

Design
As shown on the Test Data and Design Features tabs, these Polaris mounts have been extensively developed and tested to ensure high-quality performance by using the proper materials, components, and dimensional specifications. The Polaris design addresses all of the common causes of beam misalignment.

Post Mounting
The Polaris fixed optic mounts are equipped with #8 (M4) counterbores for post mounting. The mounts also feature Ø2 mm alignment pin holes around the mounting counterbore, allowing for precision alignment when paired with our Ø1" Posts for Polaris Mounts. See the Usage Tips tab for more recommendations on mounting configurations.

Cleanroom and Vacuum Compatibility
The Polaris mounts sold on this page are designed to be compatible with cleanroom and vacuum chamber applications. Please see the Specs tab and the Design Features tab for more information on vacuum compatibility.

Item # Suffixa -L05G -L1G -C05G -C1G -C2G -B05G -B1G -B05S -B1S
Optic Retention Method Glue In Flexure Clamp
Recommended Optic Type Lens Mirror Beamsplitter
Optic Sizeb Ø1/2" Ø1" Ø1/2" Ø1" Ø2" Ø1/2" Ø1" Ø1/2" Ø1"
Optic Thickness (Min) No Minimum Thickness 3.0 mm (0.12")
Beam Deviation After Thermal Cyclingc <1 μrad <2 µrad <1 μrad
Recommended Optic Mounting Adhesived Norland Optical Adhesive 61 (NOA61) or EPO-TEK 301-2FL Low-Stress Optical Epoxy N/A
Recommended Optic Mounting Torque N/A 2 - 3 oz-ine 2 - 4 oz-ine
Mountingf #8 (M4) Counterbored Slot,
0.22" (5.6 mm) Adjustment Range
#8 (M4) Counterbored Hole Three #8 (M4)
Counterbored Holes
#8 (M4) Counterbored Hole
Alignment Pin Holes Two Ø2 mm Holes for DIN 7-m6 Ground Dowel Pin at Each Counterbore
Vacuum Compatibilityg 10-9 Torr at 25 °C with Proper Bake Out; 10-5 Torr at 25 °C without Bake Out
Operating Temperature Range -30 to 200 °C
  • All item numbers in the Polaris line start with POLARIS.
  • For best performance, use optics with a diameter tolerance of up to +0/-0.1 mm.
  • After a temperature cycle, the beam typically returns to within 1 μrad of its original position for a Polaris mounted on a PLS-P150 Ø1" post and POLARIS-CA1 clamping arm. Please see the Test Data tab for details.
  • NOA61 is recommended for use with our Polaris mirror mounts because of its excellent glass-metal adhesion and low-stress mounting. However, other UV-curing adhesives are available that provide faster curing times or greater flexibility for environments with large temperature fluctuations. Please see our complete presentation for details.
  • This is the recommended torque for mounting a 6 mm thick UVFS optic.
  • The POLARIS-B05S mount comes with low-profile 8-32 and M4 cap screws. All other mounts on this page come with standard 8-32 and M4 cap screws.
  • This mount is vacuum compatible, assembled in a clean environment, chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface, and double vacuum bagged. The 8-32 and M4 cap screws included with the Polaris mount are not rated for pressures below 10-5 Torr. Contact techsupport@thorlabs.com for details.

Optic Installation Procedure for a Polaris Glue-In Mirror Mount Using a UV-Curing Adhesive

Click to Enlarge

The glue plane is highlighted for each style of glue-in mount above.

Installing an Optic into a Polaris® Glue-In Mirror Mount

Ensure that there is no grease, dirt, or dust on the optic mounting plane or on the optic itself. Polaris mounts are thoroughly cleaned and then sealed inside two vacuum bag layers to ensure the mounts are free of any contaminants when the package is first opened. If the mount has been handled at all prior to installing the optic, remove any particulates with clean, compressed air and/or clean the mount with acetone or methanol.

Using a clean stainless steel applicator or a syringe, apply a thin coating of optical adhesive to the entire optic glue plane (see photo to the right) in the area where the back surface of the optic will make contact. We recommend Norland Optical Adhesive 61 (item # NOA61, available below).

Then, slide the optic down the optic rim contact points until the back surface of the optic makes contact with the glue. The adhesive can then be cured with a UV curing LED system (Item # CS2010).

Optical Adhesives: We recommend Norland Optical Adhesive 61 (item # NOA61, available below) because of its ease of use. A 10-second pre-cure and a 10-minute final cure provides 3000 psi tensile strength, and the adhesive will maintain its performance over a wide temperature range of -150 °C to +125 °C. We also recommend EPO-TEK 301-2FL for operating temperatures up to 250 °C, at the cost of a slightly weaker bond than the NOA61. Other adhesives may be suitable depending on your application; contact Tech Support for assistance in choosing the appropriate one.

Single Plane Glue Bond: In order to minimize wavefront distortion, the adhesive layer should be confined to a single plane and should not contact the side of the optic. Polaris glue-in mounts offer relief cuts in the glue plane, allowing excess adhesive to flow away from the optic rather than onto the edges. The single plane bond prevents pockets or voids in the glue that reduce the bonding area and weaken the bond. Such pockets or voids are also more susceptible to misalignment due to fluctuations in temperature. In addition, allowing the glue to bond only to the back surface of the optic significantly reduces stress on the optic after the glue is cured.

Temperature while Curing: The temperature of the mount during the UV curing process should be controlled. UV ovens that significantly heat the mount should be avoided because the heat will cause thermal expansion of the mount, adhesive, and optic. Upon cooling, some residual stress will then develop in the glue bond and distort the optic.

See the Test Data tab for details on the low optic distortion provided by these mounts.

Positional Repeatability After Thermal Shock

This testing was done to determine how reliably the mount returns the mirror, without hysteresis, to its initial position so that the alignment of the optical system is unaffected by the temperature shock. During the testing phase, the Polaris mounts were attached to a PLS-P150 Ø1" Post and secured to a stainless steel optical breadboard using a POLARIS-CA1 clamping arm in a temperature-controlled environment. Each mount was secured to the post by an 8-32 cap screw with 16 in-lb of torque. The mirrors were glued in the mounts. The beam from an independently temperature-stabilized diode laser was reflected off the mirror’s surface onto a position sensing detector

Procedure:
For these tests, a mirror was used in all mounts, regardless of the mount style. The temperature of each mount tested was raised by at least 10 °C. The elevated temperature was maintained in order to soak the mount at a constant ambient temperature. Then the temperature of the mount was returned to the starting temperature. The results of these tests are shown below.

Results:
The maximum beam deviation of each mount depends on the magnitude of the thermal shock applied to it. However, when the Polaris fixed optic mounts were returned to the initial temperature, the angular position (both pitch and yaw) of the mirrors returned to within 1 µrad of the initial position (within 2 °rad for the POLARIS-C2G). Expand the tables below to see plots showing this data.

For Comparison:
To get a 1 µrad change in the mount’s position, the 100 TPI adjuster on the POLARIS-K1F kinematic 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 6 µrad.

Ø1/2" Polaris Mirror Mounts Thermal Shock Data
Ø1" Polaris Mirror Mounts Thermal Shock Data
Ø2" Polaris Mirror Mounts Thermal Shock Data


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Preparing a Polaris fixed optic mount for testing with our ZYGO Interferometer.

Optical Distortion Testing Using a ZYGO Phase-Shifting Interferometer

Mounting stresses are responsible for the strain that results in optical surface distortion. Minimizing distortion effects is crucial; any distortion of the optic affects the reflected wavefront. Polaris fixed optic mounts offer maximum stability while minimizing optic distortion for applications like laser cavity construction.

Glue-In Mounts

To determine the amount of optic distortion caused by the adhesive mounting process in our fixed glue-in mounts, a ZYGO Phase-Shifting Interferometer was used to measure the wavefront reflected from both unmounted and mounted mirrors (for testing purposes, a mirror was used in all three mounts). Based on results of the test, we can conclude that our glue-in Polaris mounts introduce a minimum amount of wavefront distortion.

Procedure:
A broadband dielectric mirror was loosely placed on a POLARIS-C1G mount without any adhesive. Measurements of the optic distortion were then recorded using the ZYGO interferometer. The mirror was then bonded to a POLARIS-C1G Ø1" mount using UV-curing Norland Optical Adhesive 61 (Item # NOA61, available below). Additional Zygo measurements of the fixed optic were then recorded to determine the amount of distortion induced by the mounting process. The remaining glue-in mounts were also tested with the optic bonded to the mount.

Results:
As shown in the images below, the surface of the mounted optic exhibited very little distortion. This result indicates that the optic mounting procedure results in virtually no change to the optical surface. Therefore, the Polaris fixed optic mounts are ideal for demanding applications that are sensitive to wavefront distortions.

Fixed Optic in POLARIS-C05G

Polaris Zygo Testing
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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-C05G Ø1/2" Mount with NOA61 Optical Adhesive

Fixed Optic in POLARIS-L05G

Polaris Zygo Testing
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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-L05G Ø1/2" Mount with NOA61 Optical Adhesive

Fixed Optic in POLARIS-B05G


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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-B05G Ø1/2" Mount with NOA61 Optical Adhesive

Loose Optic in POLARIS-C1G

Polaris Zygo Testing
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Optical Surface Distortion of a Loose Mirror Placed on a POLARIS-C1G Mount

Fixed Optic in POLARIS-C1G


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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-C1G Ø1" Mount with NOA61 Optical Adhesive

Fixed Optic in POLARIS-L1G

Polaris Zygo Testing
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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-L1G Ø1" Mount with NOA61 Optical Adhesive

Fixed Optic in POLARIS-B1G


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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-B1G Ø1" Mount with NOA61 Optical Adhesive

Fixed Optic in POLARIS-C2G


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Optical Surface Distortion of a Mirror Fixed in a
POLARIS-C2G Ø2" Mount with NOA61 Optical Adhesive

Flexure-Clamped Mounts

To determine the amount of optic distortion exerted on the mirror by the flexure arm, a ZYGO Phase-Shifting Interferometer was used to measure the wavefront distortion at different torque values (see the image below to the left). Based on results of the tests seen below, we recommend a torque of 2 - 3 oz-in for our Ø1/2" flexure-clamped fixed mount, at which the optic wavefront distortion is ≤0.1λ. We recommend a torque of 2 - 4 oz-in to obtain a wavefront distortion of ≤0.1λ for optics in our Ø1" flexure-clamped fixed mount, which was tested using the same method.

Procedure:
A broadband dielectric mirror was installed into a Polaris mount using the setscrew to clamp down the flexure arm. Measurements of the optic distortion were then recorded using the ZYGO interferometer. Once each measurement was complete, the amount of force needed to push the optic out of the mount was measured to check optic retention. The wavefront distortion values shown here give peak-to-valley distortion across the entire optic, representing the worst-case scenario; the center of the optic exhibits significantly less distortion than the edge.

Results:
As seen in the table below, the peak-to-valley wavefront distortion was found to be ≤0.1λ when 2 - 3 oz-in of torque was applied to the setscrew of the POLARIS-B05S Ø1/2" mount.


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POLARIS-B05S Wavefront Distortion for Setscrew Torque of 3 oz-in (See Table to the Right for Other Torque Values)
Torque (oz-in)a Push-Out Force(lbf)b Wavefront Distortion (Peak to Valley)c
1.5 >12 0.036λ to 0.052λ
2 0.045λ to 0.083λ
2.5 0.077λ to 0.097λ
3 0.089λ to 0.100λ
3.5 0.118λ to 0.137λ
4 0.131λ to 0.185λ
  • The recommended optic mounting torque range is indicated by the green highlighted rows.
  • Push-out force is the force required to move the mounted optic at the given torque value.
  • Wavefront distortion measurements were performed at λ = 633 nm. The Zygo interferometer aperture outer diameter was set to 80% for these measurements. These values represent the minimum and maximum values over multiple independent tests.

Several common factors typically lead to beam misalignment in an optical setup. For fixed optic mounts, these include temperature-induced hysteresis of the optic's position. Polaris® fixed mounts are designed specifically to minimize this misalignment factor and thus provide extremely stable performance. Hours of extensive research, multiple design efforts using sophisticated design tools, and months of rigorous testing went into choosing the best components to provide an ideal solution for experiments requiring ultra-stable performance from a fixed optic 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), such as stainless steel. However, even mounts made from a material with a low CTE do not typically return the optic to its initial position when the initial temperature is restored. Polaris fixed optic 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 rely on an adhesive to fix the optic in place. Permanent mounting with optical adhesive reduces optical surface distortion and provides superior performance for applications that are sensitive to wavefront distortion. In addition, this glue-in optic design minimizes temperature sensitivity and limits temperature-dependent hysteresis.

Vacuum Compatible and Low Outgassing
The 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. The 8-32 and M4 cap screws included with each Polaris mount are not rated for pressures below 10-5 Torr.

Each vacuum-compatible Polaris mount is packaged within two vacuum bag layers after assembly in a clean environment. These vacuum bags do not contain any desiccant materials that produce contamination and tightly wrap the mount, preventing the formation of plastic shavings due to friction against the mount during shipping. This packing method protects the mount from corrosion, gas or liquid contamination, and particulates during transport. The first vacuum bag should be opened in a clean environment while the second vacuum bag should only be opened just prior to installation. 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.


Click to Enlarge

View Imperial Product List
Item #QtyDescription
POLARIS-K1M41Polaris Kinematic Platform Mount, 2 Adjusters, 8-32 Mounting Holes
PLS-P11Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.00"
POLARIS-CA11Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw
POLARIS-L05G1Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Lenses
POLARIS-B05G1Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Beamsplitters
View Metric Product List
Item #QtyDescription
POLARIS-K1M4/M1Polaris Kinematic Platform Mount, 2 Adjusters, M4 Mounting Holes
PLS-P246/M1Ø25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 24.6 mm
POLARIS-CA25/M1Flexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw
POLARIS-L05G1Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Lenses
POLARIS-B05G1Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Beamsplitters
Polaris Glue-In Fixed Optic Mounts on a Kinematic Platform Mount

Polaris® fixed optic mounts are specifically designed to provide excellent performance under thermal changes and vibrations. Below are some usage tips to ensure that the mount provides optimal performance.

Mounting Options
Due to its relatively low coefficient of thermal expansion, stainless steel was chosen as the material from which to fabricate these Polaris mounts. When mounting a Polaris to a post, we recommend using components fabricated from the same material, such as our Ø1" Posts for Polaris Mirror Mounts and our Polaris Clamping Arm. By choosing components fabricated from the same material as the mount itself, all expansions and contractions will occur at the same rate. In addition, it is best to use the shortest possible post. Alternatively, Polaris mounts can be mounted directly onto a flat surface like a breadboard using a 1/4"-20 to 8-32 thread adapter (Item # AE8E25E) or M6 to M4 thread adapter (Item # AE4M6M), resulting in even better performance. Ensure that the mounting surface is highly flat, polished, and free of debris or scratches.

Polaris Ø1/2" fixed mounts are compact and ideal for space-constrained setups, as shown in the photo to the right.

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 for the top and bottom of the post as well as the bottom of the mount.


Posted Comments:
seifahrt  (posted 2018-05-05 14:59:56.56)
The screws provided with the Polaris-B1S/M are too long to fix the mount on a metric Polaris mounting post. They reach the bottom of the tapped hole before tightening the mount. Haven't checked the imperial version, but I think I had a similar problem there. Incidentally, the depth of the M4 (8-32) tapped hole in the Polaris mount posts is not specified in the drawings for the posts.
llamb  (posted 2018-05-14 09:12:42.0)
Thank you for your feedback. The #8-32 and M4 cap screws provided with the POLARIS-B1S have 0.5" and 12 mm long threads respectively. The bottom of the counterbore in the POLARIS-B1S is 0.15" thick where the cap screw sits. Given the counterbore thickness, at most only 0.35" of thread should be sticking out of the bottom of the -B1S. The Ø1" posts for Polaris mirror mounts (our PLS- series) have a #8-32 (M4) thread that is 0.375" deep, so you should not be able to bottom out in the PLS- post threads with the provided cap screws and the -B1S mount. I will reach out to you directly to troubleshoot and see if replacement parts need to be sent out.
nicholsm  (posted 2018-03-30 00:42:04.937)
I would definitely like to use these options in an optics setup, but is there an option optimized for 2" mirrors? That would be useful as well.
llamb  (posted 2018-03-30 10:45:58.0)
Hello, thank you for contacting Thorlabs. While we do not currently offer a standard Ø2" option for the Polaris fixed optic mounts, we may be able to offer a special custom product. I will add this new product idea to our internal forum and also reach out to you directly to discuss a quote.
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

Lens-Optimized Polaris Glue-In Fixed Optic Mounts

Fixed Polaris Lens Mount
Click to Enlarge

POLARIS-L05G with a Plano-Convex Lens
  • Lens-Optimized Glue-In Mounts for Ø1/2" or Ø1" Optics
  • Counterbored Mounting Slot Allows 0.22" (5.6 mm) Coarse Focusing Adjustment of Lenses
  • Mounting Cell with Recess for Minimal Wavefront Distortion
  • Three Optic Locating Points for Precise Optic Centering

The POLARIS-L05G and POLARIS-L1G Glue-In Fixed Optic Mounts feature a glue-in optic cell with three optic rim locating points for precise centration of the mounted optic. The adhesive optic mounting method ensures minimal optic surface distortion, providing optimum performance for applications like laser cavity construction. We recommend Norland Optical Adhesive 61 (Item # NOA61, available below) for gluing optics to these mounts. The Ø1/2" mount has a Ø0.39" transmissive clear aperture and centers the optic at 0.50" above the bottom of the mount, while the Ø1" mount has a Ø0.88" transmissive clear aperture and centers the optic at 0.75" above the bottom of the mount.

The mounts feature a #8 (M4) counterbored slot for mounting. The slot allows for a screw to be slightly tightened and then a final focusing adjustment to be made prior to final tightening, ideal for positioning lenses in a setup. In custom mounting configurations, we suggest placing the mount next to a machined flat or removable straight edge to maintain the mount's alignment during the focusing adjustment. For custom mounting configurations where the focusing adjustment is not necessary, two Ø2 mm alignment pin holes are located next to the slot for setting a precise location and mounting angle. We recommend using these mounts with a stainless steel post that also has Ø2 mm alignment pin holes, such as our Ø1" Posts for Polaris Mounts. Standard DIN 7-m6 ground dowel pins are recommended (to view the mechanical drawings, click on the red Docs icon below).

The POLARIS-L1G mount can be used with Ø25 mm optics; however, the optic locating points will not center the optic, requiring the centration to be adjusted by hand during installation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
POLARIS-L05G Support Documentation
POLARIS-L05GCustomer Inspired! Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Lenses
$36.86
Today
POLARIS-L1G Support Documentation
POLARIS-L1GPolaris Ø1" Glue-In Fixed Mount, Optimized for Lenses
$54.90
Today

Mirror-Optimized Polaris Glue-In Fixed Optic Mounts

Fixed Polaris Lens Mount
Click to Enlarge

POLARIS-C2G with a Mirror
  • Mirror-Optimized Glue-In Mounts for Ø1/2", Ø1", or Ø2" Optics
  • 180° or 252° Clear Edge Ideal for Mirrors at Low Angles of Incidence
  • Mounting Cell with Recess for Minimal Wavefront Distortion
  • Smallest Form Factor of Our Polaris Fixed Optic Mounts

The Polaris Glue-In Fixed Optic Mounts feature a 180° (Ø1/2" mount), 252° (Ø1" mount), or 270° (Ø2" mount) clear edge and an optic cell that allows optics to be glued in place. The clear-edge design allows for mirrors to be used at low incidence angles, making these mounts ideal for space-constrained systems. The adhesive optic mounting method ensures minimal optic surface distortion, providing optimum performance for applications like laser cavity construction. We recommend Norland Optical Adhesive 61 (Item # NOA61, available below) for gluing optics to this mount. The Ø1/2", Ø1", and Ø2" mounts have Ø0.39", Ø0.88", and Ø1.80" transmissive clear apertures and center the optic at 0.50", 0.75", and 1.25" above the bottom of the mounts, respectively.

The mounts feature #8 (M4) counterbores for post mounting. The Ø1/2" and Ø1" mounts feature one counterbore, while the Ø2" mount features three counterbores for setups requiring extra stability. For custom mounting configurations, two Ø2 mm alignment pin holes are located next to the central counterbore on each mount for setting a precise location and mounting angle. We recommend using these mounts with a stainless steel post that also has Ø2 mm alignment pin holes, such as our Ø1" Posts for Polaris Mounts. Standard DIN 7-m6 ground dowel pins are recommended (to view the mechanical drawings, click on the red Docs icon below).

These mounts can be used with metric-sized optics; however, the optic locating points will not center the optic, requiring the centration to be adjusted by hand during installation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
POLARIS-C05G Support Documentation
POLARIS-C05GCustomer Inspired! Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Mirrors
$38.77
Today
POLARIS-C1G Support Documentation
POLARIS-C1GPolaris Ø1" Glue-In Fixed Mount, Optimized for Mirrors
$43.50
Today
POLARIS-C2G Support Documentation
POLARIS-C2GCustomer Inspired! Polaris Ø2" Glue-In Fixed Mount, Optimized for Mirrors
$77.25
Today

Beamsplitter-Optimized Polaris Fixed Optic Mounts

Fixed Polaris Beamsplitter Mount
Click to Enlarge
View Imperial Product List
Item #QtyDescription
POLARIS-B1S1Polaris­™ Ø1" Flexure-Clamped Fixed Mount, Optimized for Beamsplitters
BSW201Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 250 - 450 nm, t = 5 mm
POLARIS-CA11Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw
PLS-P11Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.00"
View Metric Product List
Item #QtyDescription
POLARIS-B1S1Polaris­™ Ø1" Flexure-Clamped Fixed Mount, Optimized for Beamsplitters
PLS-P246/M1Ø25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 24.6 mm
POLARIS-CA25/M1Flexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw
BSW201Ø1" 50:50 UVFS Plate Beamsplitter, Coating: 250 - 450 nm, t = 5 mm
POLARIS-B1S Flexure-Clamp Mount with a Plate Beamsplitter
Fixed Polaris Beamsplitter Mount
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POLARIS-B05G Glue-In Mount with a Plate Beamsplitter

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Two cutouts in the optic bore of the Polaris beamsplitter mounts increase the transmissive clear aperture when used at 45° AOI.
  • Beamsplitter-Optimized Fixed Mounts for Ø1/2" or Ø1" Optics
  • Glue-In and Flexure-Clamp Versions Available
  • Cut-Outs in the Mounting Plane Maximize Transmissive Clear Aperture
  • Mounting Cell with Recess for Minimal Wavefront Distortion
  • Three Optic Locating Points for Precise Optic Centering

These Fixed Optic Mounts feature an optic cell with cut-outs to maximize the transmissive clear aperture, as shown in the photos to the right. This feature is especially useful for mounting beamsplitters at a 45° angle of incidence. 

Glue-In Mounts are available for Ø1/2" and Ø1" optics. The adhesive optic mounting method ensures minimal optic surface distortion, providing optimum performance for applications like laser cavity construction. We recommend Norland Optical Adhesive 61 (Item # NOA61, available below) for gluing optics to this mount. The POLARIS-B05G has a Ø0.39" transmissive clear aperture, with two Ø0.25" cutouts aligned horizontally with the center of the mount, and centers the optic at 0.50" above the bottom of the mount. The POLARIS-B1G has a Ø0.88" transmissive clear aperture, with two Ø0.51" cutouts aligned horizontally with the center of the mount, and centers the optic at 0.75" above the bottom of the mount.

Flexure-Clamp Fixed Mounts are also available for Ø1/2" and Ø1" optics. The design features a setscrew and flexure arm combination that provides stable mounting without permanently affixing the optic. When securing the optic in the mount using a 0.05" (1.3 mm) hex key, a torque of 2 - 3 oz-in should be used for the POLARIS-B05S Ø1/2" mount, while a torque of 2 - 4 oz-in should be used for the POLARIS-B1S Ø1" mount. Use a torque driver to avoid excessive tightening, which leads to optic distortion. These mounts can hold optics at least 3 mm thick. The POLARIS-B05S has a Ø0.45" transmissive clear aperture and centers the optic 0.50" above the bottom of the mount, while the POLARIS-B1S has a Ø0.90" transmissive clear aperture and centers the optic 0.75" above the bottom of the mount.

All the beamsplitter-optimized fixed mounts feature a #8 (M4) counterbore for post mounting. For custom mounting configurations, two Ø2 mm alignment pin holes are located next to the counterbore for setting a precise location and mounting angle. We recommend using these mounts with a stainless steel post that also has Ø2 mm alignment pin holes, such as our Ø1" Posts for Polaris Mounts. Standard DIN 7-m6 ground dowel pins are recommended (to view the mechanical drawings, click on the red Docs icon below).

The POLARIS-B05G and POLARIS-B1G mounts can be used with Ø12.5 mm and Ø25 mm optics, respectively; however, the optic locating points will not center the optic, requiring the centration to be adjusted by hand during installation. The POLARIS-B05S and POLARIS-B1S should not be used with Ø12.5 mm or Ø25 mm optics.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
POLARIS-B05G Support Documentation
POLARIS-B05GCustomer Inspired! Polaris Ø1/2" Glue-In Fixed Mount, Optimized for Beamsplitters
$32.31
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POLARIS-B1G Support Documentation
POLARIS-B1GPolaris Ø1" Glue-In Fixed Mount, Optimized for Beamsplitters
$48.80
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POLARIS-B05S Support Documentation
POLARIS-B05SPolaris Ø1/2" Flexure-Clamp Fixed Mount, Optimized for Beamsplitters
$77.25
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POLARIS-B1S Support Documentation
POLARIS-B1SPolaris Ø1" Flexure-Clamp Fixed Mount, Optimized for Beamsplitters
$85.89
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UV-Curing Optical Adhesive

Polaris Recommended Optical Adhesive
NOA61 is recommended for use with our Polaris mounts because of its excellent glass-metal adhesion and low-stress mounting. However, other UV-curing adhesives are available that provide faster curing times or greater flexibility for environments with large temperature fluctuations. Please see our complete presentation for details.

  • Low Shrinkage (1.5%) and Low Stress
  • Strong Glass-Metal Bond is Ideal for Use with Optics
  • Recommended UV Curing Intensity >2 mW/cm2 @ 365 nm

The NOA61 Optical Adhesive is a clear, one-part adhesive that contains no solvents. When exposed to UV light, it gels in seconds and cures fully in minutes to give a tough resilient bond. It has been optimized to adhere optical glass to metal with very little stress, making it ideal for use with our Polaris Glue-In Mounts. To cure these optical adhesives, they must be exposed to UV light. Thorlabs offers a UV curing system that provides an intensity up to 600 mW/cm2.

NOA61 optical adhesive is designed to give the best possible bond to glass surfaces and may be polished after curing. It meets Federal Specification MIL-A-3920 for optical adhesives and is approved for use on all government contracts specifying such adhesives. This adhesive has excellent adhesion to metal, fiberglass and glass-filled plastic.

Shelf Life
These UV-curing adhesives have a shelf life of approximately 8 months. This time frame begins on the date the epoxy was packaged at the manufacturer. Upon receipt by the end user, Thorlabs guarantees that the remaining shelf life will be at least 3 months.

Item # Adhesion Viscosity @ 25 °C na Tensile Strength Shore D
Hardness
Net
Weightb
Glass Metal Plastic
NOA61 Excellent Excellent Fair 300 CPS 1.56 3000 psi 85 1 ± 0.07 oz
(28 ± 2 g)
  • Index of Refraction
  • Net Weight is the intrinsic weight of the product itself, not including the weight of the packaging or other materials.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
NOA61 Support Documentation
NOA61MIL-A-3920 Optical Adhesive with Resiliency, 1 oz.
$35.99
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