Phasics SID4 Wavefront Sensor
| Brand | Phasics |
|---|---|
| Origin | France |
| Model | SID4 |
| Resolution | 400 × 300 phase pixels |
| Wavelength Range | Broadband, achromatic across full CCD spectral response (typically 350–1100 nm) |
| Beam Divergence Tolerance | High (supports divergent beams up to ±15° without relay optics) |
| Interface | USB 3.0 |
| Software Compatibility | Windows/Linux via native SDK and MATLAB/Python APIs |
Overview
The Phasics SID4 Wavefront Sensor is a high-precision, non-interferometric wavefront measurement instrument engineered for real-time quantitative phase imaging and optical aberration analysis. Based on four-wave lateral shearing interferometry (4-LSI), the SID4 eliminates reliance on reference beams or complex alignment procedures—enabling direct, single-shot wavefront reconstruction with intrinsic stability and immunity to environmental vibration. Unlike traditional Shack-Hartmann sensors, it delivers full-field, high-spatial-resolution phase maps without centroid-fitting limitations, making it especially suited for characterizing highly divergent, low-coherence, or partially coherent beams common in ultrafast laser systems, high-NA microscopy, and plasma diagnostics.
Key Features
- High-resolution phase sensing: 400 × 300 independent phase sampling points per acquisition, providing sub-microradian sensitivity and nanometer-level optical path difference (OPD) resolution.
- Achromatic optical design: Engineered with dispersion-compensated micro-optics to maintain calibration integrity across the visible to near-infrared spectrum (350–1100 nm), eliminating wavelength-dependent recalibration.
- Direct high-divergence beam compatibility: Capable of measuring beams with angular divergence up to ±15° without auxiliary collimation or relay optics—ideal for fiber-coupled sources, VCSEL arrays, and EUV plasma emissions.
- Real-time operation: Full-frame wavefront reconstruction at up to 60 Hz (depending on exposure and host system), with latency under 100 ms for closed-loop adaptive optics integration.
- Robust architecture: Solid-state, monolithic sensor head with no moving parts; designed for laboratory, cleanroom, and industrial OEM integration.
Sample Compatibility & Compliance
The SID4 accommodates free-space and fiber-delivered beams with diameters ranging from 1 mm to 25 mm (with optional beam expanders). It supports continuous-wave (CW) and pulsed lasers (including femtosecond systems with appropriate attenuation), thermal emission sources, and broadband incoherent illumination. The sensor complies with CE marking requirements and meets electromagnetic compatibility (EMC) standards per EN 61326-1. Its firmware and acquisition software support audit-trail logging and user-access control, facilitating alignment with GLP and ISO/IEC 17025 quality management frameworks for metrology laboratories.
Software & Data Management
The included SID4 Control Suite provides intuitive GUI-based acquisition, visualization, and analysis—including Zernike decomposition, RMS/PV wavefront error calculation, M² estimation, and Strehl ratio derivation. A comprehensive SDK (C/C++, Python, MATLAB) enables seamless integration into custom automation pipelines and real-time feedback loops. All raw interferograms and reconstructed phase maps are stored in HDF5 format with embedded metadata (timestamp, exposure, wavelength, ROI configuration), ensuring traceability and interoperability with FAIR data principles. Optional FDA 21 CFR Part 11 compliance packages include electronic signature support and immutable audit logs for regulated environments.
Applications
- Laser beam characterization: Quantitative M², BPP, and focusability assessment for industrial CO₂, fiber, and ultrafast lasers.
- Adaptive optics systems: High-bandwidth wavefront sensing for deformable mirror control in astronomy, ophthalmology, and laser communications.
- Optical component testing: Surface figure and transmitted wavefront error evaluation of lenses, mirrors, windows, and aspheric elements—without null optics.
- Biomedical imaging: Phase contrast enhancement in label-free live-cell microscopy and quantitative phase tomography.
- Plasma and thermal diagnostics: Time-resolved wavefront distortion mapping in laser-induced plasmas, combustion chambers, and high-temperature gas flows.
FAQ
Does the SID4 require external calibration for different wavelengths?
No—the SID4’s achromatic design maintains consistent phase sensitivity across its specified spectral range (350–1100 nm); no hardware recalibration or software wavelength input is required.
Can it measure pulsed lasers?
Yes, provided pulse energy is attenuated to avoid CCD saturation; the sensor supports gated acquisition synchronized to external triggers for time-resolved wavefront analysis.
Is the device compatible with vacuum or UHV environments?
The standard SID4 is not vacuum-rated; however, Phasics offers custom OEM variants with vacuum-compatible housings and feedthroughs upon request.
What level of Zernike polynomial fitting is supported?
The software computes up to 36 Zernike coefficients (n=0 to n=7) by default, with exportable coefficients and residual error maps for metrology reporting.
How is measurement uncertainty quantified?
Uncertainty budgets follow ISO 10110-5 and ISO 14132-3 guidelines; typical repeatability is ±0.5 nm RMS OPD over 1 hour under stabilized thermal conditions.
