SPL Photonics LC Variable Phase Retarder
| Origin | Canada |
|---|---|
| Supplier Type | Distributor |
| Import Status | Imported |
| Model | LC Variable Phase Retarder |
| Component Category | Optical Element |
| Pricing | Upon Request |
Overview
The SPL Photonics LC Variable Phase Retarder is a precision electro-optic component engineered for dynamic control of optical phase difference between orthogonal polarization states. Based on nematic liquid crystal (LC) technology, it operates on the principle of electrically induced birefringence modulation: applying a tunable voltage across the LC cell alters the effective refractive index experienced by ordinary and extraordinary rays, thereby varying the retardance continuously from 0 to >λ/2 across the visible to near-infrared spectrum (typically 400–1100 nm). Unlike static waveplates, this device enables real-time, repeatable, and non-mechanical phase tuning—critical for adaptive polarization optics, quantum state manipulation, ellipsometry calibration, and laser cavity mode control. Its solid-state architecture ensures high stability, low wavefront distortion (<λ/10 RMS), and compatibility with vacuum and vibration-sensitive optical benches.
Key Features
- Electrically tunable retardance: 0–360° (0–2π rad) phase shift at design wavelength, with sub-degree resolution via analog voltage control (0–5 V or 0–10 V input)
- High extinction ratio (>1000:1) and low insertion loss (<1.5 dB typical across VIS–NIR range)
- Aperture options: 10 mm, 20 mm, and 25 mm clear aperture; custom sizes available upon request
- AR-coated fused silica substrates (R<0.25% per surface) optimized for specified wavelength bands
- Integrated driver interface compatible with standard function generators or dedicated LC controllers (e.g., Thorlabs LCC25, Meadowlark Optics BPC-200)
- Operating temperature range: 15–35 °C; storage: –10 to +60 °C
- No moving parts—immune to mechanical wear, shock, or acoustic noise
Sample Compatibility & Compliance
The LC Variable Phase Retarder is designed for integration into free-space optical systems requiring polarization agility without beam deviation. It accommodates collimated beams with diameters up to 90% of the clear aperture and maintains performance under moderate power densities (<500 mW/cm² CW at 532 nm). The device complies with RoHS Directive 2011/65/EU and meets IEC 61000-4-2 ESD immunity standards (Level 3, ±8 kV contact discharge). While not certified for medical or aerospace use, its construction adheres to ISO 10110-7 surface quality specifications (scratch-dig 20–10) and is routinely employed in GLP-compliant optical metrology labs for instrument calibration and reference standard traceability.
Software & Data Management
No embedded firmware or proprietary software is required for basic operation—voltage-driven analog control allows direct interfacing with lab-grade DAQ systems (e.g., National Instruments USB-6211) or programmable power supplies. For automated experiments, SPL Photonics provides LabVIEW-compatible VI libraries and Python API examples (via PyVISA) supporting voltage ramping, step-and-hold sequences, and synchronization with camera shutters or lock-in amplifiers. All devices ship with NIST-traceable calibration certificates documenting retardance vs. voltage curves at three reference wavelengths (e.g., 532 nm, 633 nm, 780 nm), including uncertainty budgets per GUM (JCGM 100:2008). Audit trails and calibration history are maintained in accordance with ISO/IEC 17025:2017 requirements for testing laboratories.
Applications
- Polarization-resolved microscopy: dynamic Stokes parameter acquisition and Mueller matrix imaging
- Laser cavity Q-switching and intra-cavity polarization feedback stabilization
- Quantum optics experiments: generation and tomography of arbitrary two-qubit photonic states
- Ellipsometric sensor development: real-time compensation for substrate-induced depolarization
- Optical coherence tomography (OCT): dispersion compensation and polarization diversity detection
- Teaching laboratories: hands-on demonstration of Poincaré sphere navigation and Jones calculus
FAQ
What is the typical response time for full retardance modulation?
Rise/fall times range from 20–100 ms depending on drive voltage amplitude and ambient temperature—faster switching is achievable using overdrive techniques with controlled voltage slew rates.
Can this retarder be used with pulsed lasers?
Yes, provided pulse energy density remains below damage threshold (≥0.5 J/cm² for 10 ns pulses at 1064 nm); thermal lensing effects must be evaluated for high-repetition-rate ultrafast sources.
Is vacuum compatibility available?
Standard units are not vacuum-rated; however, hermetically sealed variants with metalized feedthroughs can be supplied for UHV environments (<10⁻⁶ mbar) upon engineering review.
How is wavelength dependence handled in multi-wavelength setups?
Retardance scales inversely with wavelength; users may apply wavelength-specific calibration curves or implement closed-loop feedback using a polarimeter to maintain target phase at each channel.
Does SPL Photonics offer OEM integration support?
Yes—custom mounting kinematics, electrical connectors, thermal management interfaces, and optical coatings are available under NDA for volume OEM deployments.
