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45° Mounting Adapters
For KM100 and KM200
For Ø1" or Ø25 mm Polaris
POLARIS-K1F Mirror Mount with POLARIS-LN1 Lock Nuts Mounted on a POLARIS-MA45 Adapter
These mounting adapters are ideal for mounting Thorlabs mirror mounts at 45° with respect to an optical table, breadboard, or work surface. The MA45-2 is designed to mount standard Ø1" or Ø2" kinematic mirror mounts, and the POLARIS-MA45(/M) is designed to mount Ø1" or Ø25 mm Polaris® mirror mounts.
The POLARIS-MA45(/M) is constructed from 303 stainless steel, matching the material used to machine our Polaris mirror mounts for optimal thermal repeatability and vacuum compatibility. All Polaris products undergo extensive testing to ensure high quality performance; this testing can be viewed in the Polaris Test Data tab.
POLARIS-MA45 Positional Repeatability after Thermal Shock
Polaris® components have undergone extensive testing to ensure high-quality performance. Here, a Polaris mirror mount was secured to a POLARIS-MA45 which was then secured to a stainless steel rigid platform in a temperature-controlled environment. A beam from an independently temperature-stabilized laser diode was reflected by the mirror onto a position-sensing detector.
Purpose: This testing was done to determine how reliably the mirror mount and 45° mounting adapter system 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 the Polaris mount and adapter system tested was raised to 37.5 °C. This temperature shock was maintained for approximately 60 minutes (soak time, see plots below). Then the temperature of the mirror mount system was returned to the starting temperature. The results of these tests are shown below.
Results: As can be seen in the plots below, when the Polaris mount and adapter system were returned to their initial temperature, the angular position (both pitch and yaw) of the mirrors returned to within 2 µrad of its initial position. The performance of the Polaris system was tested further by subjecting the mount to repeated temperature change cycles. After each cycle, the mirror mount system position reliably returned to within 2 µrad of its initial position.
Conclusions: The Polaris 45° mounting adapter paired with a Polaris mirror mount is a high-quality, ultra-stable system that will reliably return a mirror to its original position after cycling through a temperature change. As a result, this system is ideal for use in applications that require long-term alignment stability. This also shows that the addition of the POLARIS-MA45 to the Polaris mirror mount does not compromise the performance of the mirror mount alone.
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The plot above shows the pitch and yaw measured by a position-sensing detector before, while, and after a thermal shock was applied to the POLARIS-MA45 mounting adapter and Polaris mirror mount.
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The plot above shows the final angular position of the system 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 and includes factors such as the variation in room temperature.
Click to Enlarge POLARIS-K1F Mirror Mount Held at 45° by a POLARIS-MA45 Mounted on a Ø1" Post which is Held by a POLARIS-CA1 Clamping Arm
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POLARIS-MA45(/M) Mechanical Drawing
The POLARIS-MA45(/M) 45° Mounting Adapters securely mount Ø1" or Ø25 mm Polaris Mirror Mounts at a 45° angle with respect to the optical table, breadboard, or working surface. The adapter has an 8-32 (M4) tap on the 45° face for securing the mirror mount, and a bottom-located 1/4"-20 (M6) tap for attachment to Ø1" (Ø25.0 mm) Posts. Two Ø2 mm alignment pin holes around each tap allow for direct, precision mounting within custom or OEM systems (see diagram to the bottom right for details).
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Each Polaris product undergoes extensive thermal testing to ensure high-quality performance. Please see the Polaris Test Data tab for additional test results.
When using our standard Ø1" or Ø25 mm Polaris mounts, the height to the center of the mirror will be 2" from the base of the mounting adapter when using the
This adapter is made from heat-treated 303 stainless steel, which has a relatively low coefficient of thermal expansion (CTE) and matches the material used in all of our Polaris mirror mounts. Matching the CTE of materials within an optical setup is essential to achieve optimal thermal repeatability. Heat treating the materials used removes the internal stresses that can cause temperature-dependent hysteresis. Therefore, when mounting, we only recommend using components fabricated from the same material. This is shown in the image above, where a
Cleanroom and Vacuum Compatibility
Click to Enlarge UPHA Base and KM100 Mirror Mount
The MA45-2 (MA45-50/M) 45° mounting adapter is designed to allow our KM100 and KM200 mirror mounts to be securely held at 45° with respect to the optical table, breadboard, or working surface. The beam height to the center of a mirror mounted in a KM100 on a MA45-2 is 2" (50.8 mm). The beam height of the same assembly using the KM200 is 2.49" (63.2 mm).
An 8-32 (M4) tap is provided on the 45° flat surface of the adapter so the KM100 can be directly fastened to that surface with a cap screw. This mounting adapter can be secured to our Ø1" (Ø25 mm) posts or post holder bases via a bottom-located 1/4"-20 (M6) cap screw.