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Hermetically Sealed Piezo Actuator, 17.0 µm Travel
150 V PZT, 17.0 µm,
Proper Mounting Method
(Sold Separately Below)
Thorlabs' PH24SRW Hermetically Sealed Piezoelectric Actuator consists of a PK4FQP1 Discrete Piezoelectric Stack mounted inside a metal bellows and sealed with end caps under N2. The bellows and end caps are laser welded to create a hermetic seal, resulting in longer service life and higher reliability, even under vacuum or in environments with high humidity, water, or oil exposure.
Divots in the metal end caps are intended for use with ceramic mounting hemispheres, as illustrated in the diagram above. This configuration assists in directing the force along the actuator's axis of translation, while making it possible to interface the actuator with an off-axis load, as the hemisphere's curved surface routes the applied force along the actuator's translating axis. The hemispheres should be epoxied to the user assembly while the actuator is held in place by the hemispheres alone. If attaching the actuator directly to the user assembly, we recommend using 353NDPK, TS10, or Loctite Hysol 9340 epoxies.
For use in high vacuum enivronments, we recommend cleaning the part with isopropyl alcohol (IPA) in an ultrasonic immersion tank and then baking it at 60 °C for two hours. If using a custom baking process, the maximum baking temperature should be less than 150 °C and the baking time should be less than 2 hours.
Caution: After driving, the piezo is fully charged. Directly connecting the red and black wires has the risk of electricity discharging, spark, and even failure. We recommend using a resistor (>1 kΩ) between the wires to release the charge.
Click to Enlarge
Dicing the PZT Block into Individual Elements
Thorlabs' In-House Piezoelectric Manufacturing
Our piezoelectric chips are fabricated in our production facility in China, giving us full control over each step of the manufacturing process. This allows us to economically produce high-quality products, including custom and OEM devices. A glimpse into the fabrication of our piezoelectric chips follows. For more information about our manufacturing process and capabilities, please see our Piezoelectric Capabilities page.
These alumina hemispheres are compatible with the end plates of the hermetically sealed piezoelectric stack sold above. They can be used to provide stable contact between the stack housing and a lever arm. We do not recommend using hemispheres with diameters greater than 6 mm with the actuator sold above due to low divot penetration depth. These hemispheres have a diameter tolerance of ±0.1 mm. Thorlabs also offers other sizes of hemispheres as well as end plates and end cups for use with other piezoelectric stacks.