Auniontech FROG Scan Real-Time Mid-IR Frequency-Resolved Optical Gating (FROG) Pulse Characterization System
| Brand | Auniontech |
|---|---|
| Origin | Germany |
| Manufacturer Type | Authorized Distributor |
| Product Category | Imported Instrument |
| Model | FROG Scan |
| Price | Upon Request |
Overview
The Auniontech FROG Scan is a real-time, high-fidelity frequency-resolved optical gating (FROG) system engineered for comprehensive temporal and spectral characterization of ultrashort laser pulses in the mid-infrared (mid-IR) spectral region. Based on the well-established SHG-FROG principle—where a pulse is split into signal and gate arms, with the gate arm delayed via a high-precision mechanical optical delay line and both recombined in a second-harmonic generation (SHG) crystal—the system captures intensity-resolved spectrograms (FROG traces) as a function of delay τ and frequency ω. These 2D traces are then inverted using the patented Principal Component Generalized Projections (PCGP) algorithm to retrieve both amplitude and phase profiles of the electric field E(t), enabling full time-domain reconstruction without assumptions. Unlike conventional FROG implementations limited to visible/NIR bands, the FROG Scan extends operational coverage to 2000–3400 nm, filling a critical gap in ultrafast metrology for mid-IR sources such as OPOs, QCLs, and difference-frequency generators.
Key Features
- Real-time acquisition and iterative retrieval at video-rate frame throughput, supporting dynamic monitoring of evolving pulse characteristics during laser optimization or cavity alignment.
- High-precision mechanical delay stage with sub-femtosecond timing resolution and >10× faster scanning speed compared to standard motorized delay lines—enabling robust measurement of pulses as short as 12 fs.
- Modular optical architecture: Interchangeable SHG crystals (e.g., AgGaS₂, GaSe, DAST) and calibrated spectrometers (Ocean Insight USB4000/USB2000+) support seamless wavelength coverage from 450 nm to 3400 nm.
- 75 dB dynamic range and high spectral fidelity ensure accurate recovery of complex pulse structures—including higher-order dispersion, satellite pulses, and strong phase distortions—common in amplified Ti:sapphire, Cr:ZnS, and mid-IR parametric systems.
- Integrated thermal and mechanical stabilization ensures long-term measurement repeatability under laboratory conditions, meeting requirements for GLP-compliant ultrafast diagnostics.
Sample Compatibility & Compliance
The FROG Scan accommodates free-space collimated beams with diameters from 2 mm to 8 mm and input energies ranging from 10 nJ to 1 µJ per pulse (adjustable via neutral density filtering). It supports pulse durations from 12 fs up to several picoseconds and repetition rates from single-shot to 1 kHz (with optional synchronization input). The system complies with IEC 61000-6-3 (EMC emission standards) and meets CE marking requirements for laboratory instrumentation. While not certified for clinical or industrial process control, its data integrity and traceable calibration pathways align with ISO/IEC 17025 principles for testing laboratories performing ultrafast optical characterization.
Software & Data Management
VideoFROG Scan is a native Windows-based application built for deterministic real-time operation and audit-ready data handling. It implements FDA 21 CFR Part 11–compatible features including user-level access control, electronic signatures, and immutable audit trails for all acquisition parameters, processing steps, and export events. The GUI employs a modular dashboard layout: the main view displays synchronized time-domain intensity |E(t)|², spectral intensity |Ẽ(ω)|², instantaneous frequency (chirp), and the raw FROG trace—all updated in real time. Users may define regions of interest (ROIs) for spectral slicing, apply background subtraction, and export fully annotated datasets in HDF5 or MATLAB-compatible formats. All PCGP reconstructions include convergence metrics and residual error maps, supporting method validation per ISO 17025 Clause 7.7.
Applications
- Characterization and dispersion compensation of mid-IR ultrafast oscillators and amplifiers (e.g., Cr:ZnS, Fe:ZnSe, OPA outputs).
- In situ optimization of hollow-core fiber compressors, chirped-mirror stacks, and multipass cells by quantifying residual group-delay dispersion (GDD) and third-order dispersion (TOD).
- Diagnostics of nonlinear frequency conversion processes—including DFG, SFG, and OP-GaAs-based pulse generation—where phase-matching bandwidth and pump depletion effects distort temporal profiles.
- Validation of pulse fidelity in ultrafast spectroscopy setups (e.g., 2D-IR, transient absorption) where timing jitter and pulse asymmetry directly impact signal-to-noise ratio.
- Research-grade metrology for attosecond science infrastructure requiring traceable, sub-10-fs pulse verification across extended infrared bands.
FAQ
What pulse duration range does the FROG Scan support?
The system measures pulses from 12 fs to >10 ps, depending on selected SHG crystal, spectrometer resolution, and delay line range.
Can it measure pulses outside the 2000–3400 nm range?
Yes—by swapping the nonlinear crystal and spectrometer, coverage extends from 450 nm to 3400 nm; full configuration details are provided in the technical specification sheet.
Is VideoFROG Scan compatible with third-party spectrometers?
Only Ocean Insight USB4000 and USB2000+ models are officially supported and factory-calibrated; custom integration requires OEM-level SDK licensing.
Does the system provide phase-retrieval uncertainty estimates?
Yes—each PCGP reconstruction includes a normalized residual error map and convergence history, enabling quantitative assessment of retrieval confidence per ISO/IEC 17025 Annex A.
How is calibration traceability maintained?
Wavelength calibration uses NIST-traceable Hg/Ne spectral lines; temporal calibration is verified using interferometric autocorrelation with a reference Ti:sapphire oscillator.
