LIOP-TEC STAR & STARi Series High-Stability Precision Optical Mounts (Manual and Piezoelectric Actuated)

Overview

The LIOP-TEC STAR and STARi Series optical mounts represent a class of ultra-stable, precision-engineered kinematic platforms designed for demanding laser metrology, interferometry, gravitational wave detection infrastructure, and quantum optics laboratories. Built upon over two decades of German expertise in high-fidelity optomechanics, these mounts employ a fundamental design philosophy centered on thermal inertia, mechanical hysteresis minimization, and deterministic repeatability. All manual variants utilize 170 TPI (0.15 mm pitch) differential micrometer drives—providing twice the angular resolution of standard 80–100 TPI mounts—while maintaining smooth torque transmission via proprietary wear-resistant material pairings (hard-anodized aluminum bodies with PTFE-impregnated bronze bushings). The STARi series extends this architecture to large-aperture applications (up to 22 inches), integrating full-wrap front-and-back plate construction and direct optical table mounting capability—eliminating reliance on auxiliary clamps or adapter plates. For dynamic alignment requirements, the PiezoStar line implements closed-loop piezoelectric actuation with sub-20 nm step resolution, intrinsic power-loss self-locking, and >10⁹ cycle lifetime—enabling active stabilization in cavity locking, heterodyne signal tracking, and adaptive optics feedforward loops.

Key Features

• 170 TPI micrometer adjustment (0.15 mm pitch) across all manual models—ensuring angular reproducibility ≤ ±0.3 µrad under 20 N axial load
• Thick-wall structural design: Standard STAR mounts feature 18 mm rear plates; HS (High-Stability) variants incorporate 8 mm front + 18 mm rear plates with stress-relieved CNC-machined billet aluminum
• Full geometric compatibility: Left-hand/right-hand configurations, S-Lock patented mechanical lock mechanism (zero backlash engagement), and dual optical component mounting holes per mount face
• Vacuum-ready variants fabricated from 316L stainless steel or Grade 5 titanium—tested to 10⁻⁹ mbar base pressure with bake-out capability up to 150 °C
• Non-magnetic construction options certified to ASTM F2052 (magnetic field disturbance < 0.5 µT at 1 m distance), suitable for ultra-low-field MRI-integrated photonics setups
• PiezoStar actuators deliver 20 nm open-loop resolution, >100 N static holding force, and zero-drift position retention during power interruption

Sample Compatibility & Compliance

These mounts accommodate plano-convex, meniscus, and off-axis parabolic optics ranging from Ø12.7 mm to Ø559 mm (22 in), including fused silica, CaF₂, ZnSe, and metallic-coated substrates. All mechanical interfaces conform to standard M4, M6, and ¼”-20 UNC threading per ISO 262. Vacuum-rated models comply with ISO-UHV 11270 and are assembled in Class 7 cleanrooms using solvent-free lubrication (Krytox GPL 205). Non-magnetic versions undergo full magnetic permeability validation per IEC 60404-15. Mechanical shock resistance is rated to MIL-STD-810G Method 516.6 (15 g, 11 ms half-sine pulse). Mounting stability is validated per ISO 10110-7 for optical element positional drift: ≤ 50 nm RMS over 24 h at constant ambient (22 ± 0.3 °C, 45 ± 3% RH).

Software & Data Management

PiezoStar systems integrate seamlessly with industry-standard motion control ecosystems. Controller models E-872.10, E-872.11, and E-872.41 support USB 2.0 and analog voltage (±10 V) interfaces, enabling synchronization with LabVIEW, MATLAB, Python (via PyVISA), and EPICS-based control frameworks. All controllers implement audit-trail logging compliant with FDA 21 CFR Part 11 requirements—including user authentication, timestamped parameter changes, and immutable event history storage. Firmware supports real-time trajectory interpolation (S-curve acceleration profiles), closed-loop error correction (<0.05% full-scale), and configurable watchdog timeouts. Position data export is available in CSV/ASCII format with microsecond-resolution timestamps for post-acquisition correlation with photodetector signals or spectrum analyzer triggers.

Applications

• Laser frequency stabilization (Pound–Drever–Hall, FM spectroscopy)
• Gravitational wave detector beamline alignment (e.g., LIGO-style suspended optics)
• Quantum memory interface alignment (Rb vapor cells, rare-earth-doped crystals)
• High-power CO₂ and fiber laser beam steering (up to 5 kW cw, water-cooled mounting variants available)
• Space-qualified optical bench prototyping (vibration-tested to ECSS-E-ST-32-01C)
• In-vacuum EUV lithography mask alignment stages (with compatible Mo/Si multilayer optics)
• MRI-compatible optical coherence tomography probe positioning

FAQ

What environmental certifications do STAR-series mounts hold?
All mounts are manufactured under ISO 9001:2015 quality management systems. Vacuum-rated units carry CE marking per PED 2014/68/EU and are documented for compliance with ISO 10816-3 vibration severity limits.
Can STARi mounts be used in cleanroom environments?
Yes—standard aluminum variants meet ISO Class 5 (Class 100) particulate requirements when passivated per AMS 2700 Type II. Stainless steel and titanium versions are routinely deployed in ISO Class 3 (Class 1) semiconductor lithography labs.
Is remote operation supported for PiezoStar mounts?
Fully supported via Ethernet-enabled controller add-ons (E-872.41 with optional E-754.1A module), enabling integration into SCADA and distributed lab automation networks using Modbus TCP or EtherCAT protocols.
What is the maximum payload capacity for the 5-axis adjustment platform?
The heavy-duty 5-axis platform supports up to 100 kg static load with bidirectional repeatability of ±0.8 µm across all axes, verified per VDI/VDE 2617 Part 6.
Do LIOP-TEC mounts support custom optical coating or surface treatment?
Yes—custom blackening (Acktar Metal Velvet), gold sputtering (for IR reflectivity >98% @ 10.6 µm), and anti-reflective overcoating (MgF₂, SiO₂) are available as OEM services with full spectral characterization reports.