Laser Quantum Gigajet Twin Series Dual Femtosecond Oscillator

Overview

The Laser Quantum Gigajet Twin Series is a precision-engineered dual femtosecond oscillator system designed for advanced ultrafast optical metrology and coherent light synthesis. Built upon two independently stabilized, yet mutually synchronized Gigajet oscillators mounted on a common thermally controlled baseplate, the system enables deterministic temporal and spectral correlation between two ultrashort pulse trains. Each oscillator operates on the principle of Kerr-lens mode-locking (KLM) in a Ti:sapphire gain medium, pumped by a single 532 nm CW solid-state laser. The shared mechanical and thermal architecture ensures sub-500 Hz long-term repetition rate drift per channel—critical for applications demanding phase coherence across multiple optical paths over extended measurement windows. Unlike cascaded or split-beam approaches, the Gigajet Twin delivers two fully independent, actively lockable pulse sources with programmable repetition rate relationships—enabling both identical-frequency parallel operation and precisely defined frequency-offset configurations (e.g., Δf = 100 kHz–10 MHz) required for asynchronous optical sampling (ASOPS) and dual-comb spectroscopy.

Key Features

• Co-located, thermally stabilized dual-oscillator platform ensuring mechanical and thermal phase coherence
• Independent yet synchronizable repetition rates: 333 MHz, 500 MHz, or 1 GHz (Gigajet Twin); 1 GHz only (Twin C/S variants)
• Sub-50 fs pulse duration across all models—with Gigajet Twin S delivering ≤15 fs pulses at 800 nm
• High spatial beam quality: M² ≤ 1.2 (sagittal plane) and ≤ 1.6 (tangential plane for Twin C), supporting diffraction-limited focusing and efficient nonlinear conversion
• Wavelength flexibility: Fixed 800 ± 20 nm output (Twin & Twin S) or electronically tunable 750–850 nm range (Twin C)
• Integrated active synchronization electronics enabling real-time phase locking or stable frequency offset generation
• Robust architecture compliant with laboratory-grade environmental tolerances (operating temperature: 21 ± 5 °C)

Sample Compatibility & Compliance

The Gigajet Twin Series is engineered for integration into ISO/IEC 17025-accredited metrology labs and university-based ultrafast photonics facilities. Its optical design supports direct coupling into vacuum-compatible beamlines, nonlinear frequency conversion stages (e.g., OPA, DFG, SHG), and free-space or fiber-coupled interferometric setups. All models comply with IEC 60825-1:2014 Class 4 laser safety requirements when operated within specified pump and output power limits. The system’s passive thermal stabilization and low acoustic sensitivity meet stringent vibration and thermal drift criteria outlined in ASTM E2912–13 (Standard Practice for Ultrafast Laser Characterization). While not inherently FDA-certified, its traceable timing stability and reproducible pulse parameters support GLP-aligned experimental protocols in optical clock development and frequency comb calibration workflows.

Software & Data Management

Control and monitoring are executed via Laser Quantum’s proprietary TwinSync Manager software suite, running on Windows-based host PCs with real-time Ethernet interface. The software provides simultaneous access to individual oscillator diagnostics—including cavity length feedback signals, pump power monitoring, repetition rate readout (with 10 mHz resolution), and inter-oscillator phase error tracking. All synchronization parameters (lock point, bandwidth, offset frequency) are programmable through intuitive GUI controls or SCPI command set for automated test sequences. Audit trails, timestamped configuration logs, and binary pulse train metadata export (in HDF5 format) ensure compliance with 21 CFR Part 11 requirements for regulated research environments. Remote operation via TCP/IP and integration with LabVIEW™ and Python APIs enable seamless incorporation into custom data acquisition pipelines.

Applications

• Optical frequency comb generation and stabilization for primary frequency standards and atomic clock comparisons
• Precision dual-comb spectroscopy in mid-IR and THz domains via difference-frequency generation
• Asynchronous optical sampling (ASOPS) for sub-picosecond time-resolved reflectometry and pump-probe studies
• Fourier-transform infrared (FTIR) spectroscopy with enhanced acquisition speed and signal-to-noise ratio
• Nonlinear Raman and coherent anti-Stokes Raman scattering (CARS) microscopy requiring phase-stable dual-pulse excitation
• Attosecond science infrastructure—serving as seed sources for high-harmonic generation (HHG) and electron dynamics probing

FAQ

What pump laser specifications are mandatory for reliable operation?
A continuous-wave, TEM₀₀-mode, vertically polarized 532 nm laser delivering ≥5 W average power is required. Beam pointing stability <5 µrad and intensity noise <0.5% RMS (10 Hz–10 MHz) are recommended for optimal KLM initiation and long-term mode-locking robustness.
Can the two oscillators operate at different repetition rates simultaneously?
Yes—the Gigajet Twin supports both synchronous (identical f_rep) and asynchronous (fixed Δf) modes. Frequency offset is digitally synthesized and stabilized using RF phase-locked loops with <100 mHz residual jitter.
Is vacuum compatibility available for the oscillator cavity?
The standard Gigajet Twin is air-operated. Custom vacuum-sealed cavity options (up to 10⁻⁵ mbar) are available under OEM agreement, including bake-out compatible materials and feedthrough-integrated piezo actuators.
How is timing jitter characterized and minimized across the dual-channel output?
Integrated balanced optical cross-correlators monitor inter-pulse timing fluctuations in real time. Feedback to intracavity piezo transducers achieves integrated jitter <10 fs (1 kHz–10 MHz) in locked mode, validated per IEEE Std 1139–2008.
Does the system support third-party synchronization protocols such as TTL or LVDS triggers?
Yes—dedicated SMA ports provide programmable TTL/LVDS outputs synchronized to either oscillator’s pulse train or their beat note, enabling external device triggering with <50 ps jitter.