PI Develops Cryogenic 6-Axis Hexapod Program to Improve Quantum Precision

[Ahmet Ö.]

With advancements in quantum and photonic technologies, the need for precise optical alignment under low-temperature conditions is becoming increasingly critical. To meet this requirement, PI (Physik Instrumente), a global leader in precision motion control and nanopositioning, has launched its low-temperature development program, focusing on extending its nanopositioning expertise to multi-axis systems for quantum applications.

While early cryogenic motion solutions often relied on stacked XYZ stages, next-generation applications demand alignment systems with 5 and 6 degrees of freedom. These systems are being developed to handle larger loads and manage complex optical configurations.

The concept developed by PI is based on a compact, 6-degrees-of-freedom parallel kinematic hexapod design. Designed to provide nanometer-precision multi-axis motion in confined spaces such as cryostats and dilution refrigerators, these systems are ideal for beam steering, correcting lens aberrations, polarization control, fiber alignment, and precise positioning of dispersive elements like gratings or prisms.

### PI Cryogenic 6-Axis Hexapod Features

• Operating temperature: Ultra-low temperatures of 4 Kelvin and below
• Capacity: Carries loads of several hundred grams
• Travel range: Millimeter-scale motion
• High stability and repeatability
• Parallel kinematic structure offering six degrees of freedom
• Low inertia and energy requirement
• Precise rotational alignment with programmable pivot point
• Optically unhindered open aperture
• Self-locking when power is off due to piezo-based architecture
• Non-magnetic materials and ultra-high vacuum (UHV) compatibility

Thanks to hexapod parallel kinematics, all degrees of freedom are controlled simultaneously, reducing error accumulation that occurs in stacked systems. Piezo-based technology minimizes heat generation while using energy efficiently, providing a critical advantage for thermally sensitive cold environments.

With this program, PI is taking motion technologies a step further for use in quantum research and advanced cryogenic photonic systems.