Keopsys CYFL-TERA Series Continuous-Wave Ytterbium-Doped Terahertz-Linewidth Fiber Laser

Overview

The Keopsys CYFL-TERA Series is a high-performance continuous-wave (CW) ytterbium-doped fiber laser engineered for applications demanding stable, narrowband optical sources in the 1060–1090 nm spectral range. Based on master oscillator power amplifier (MOPA) architecture with double-clad fiber amplification, the system delivers up to 20 W of diffraction-limited output power while maintaining a spectral linewidth in the sub-nanometer to few-nanometer regime—ideal for pump-probe spectroscopy, nonlinear frequency conversion, and seeding of ultrafast amplifiers. Unlike broad-spectrum ASE sources or multimode diodes, the CYFL-TERA leverages precisely controlled gain dynamics and intracavity filtering to ensure high temporal coherence and low relative intensity noise (RIN < −135 dB/Hz typical). Its robust all-fiber design eliminates free-space alignment, enabling long-term stability under thermal and mechanical stress—critical for integration into OEM systems or metrology-grade instrumentation.

Key Features

• Wavelength tunability across 1060–1090 nm via integrated wavelength-selective elements, supporting flexible integration with optical parametric oscillators (OPOs) and difference-frequency generation (DFG) setups
• Output power stability better than ±0.5% RMS over 8 hours (25 °C ambient, active cooling), verified per ISO 11554 calibration protocols
• Free-space collimated output (FC/APC or QBH connector options) with M² < 1.1, ensuring efficient coupling into single-mode fibers or nonlinear crystals
• Integrated digital control interface (RS-232, USB, and optional analog 0–5 V modulation input) compliant with SCPI command set for automated test environments
• Thermoelectrically stabilized pump diodes and fiber Bragg grating (FBG)-based wavelength locking for drift < 5 pm/°C
• Compliance with IEC 60825-1:2014 (Class 4 laser product), EN 61000-6-3 (EMC emission), and EN 61000-6-2 (EMC immunity)

Sample Compatibility & Compliance

The CYFL-TERA series supports direct coupling into standard SMF-28, PM980, or polarization-maintaining photonic crystal fibers without mode-field adaptors. It is compatible with vacuum-compatible optical tables, cryogenic sample stages (via fiber feedthroughs), and ultra-high-vacuum chambers when equipped with hermetic fiber pigtails (optionally available with metalized jackets). All units undergo full factory calibration traceable to NIST standards and include a Certificate of Conformance listing measured parameters: center wavelength (±0.1 nm), output power (±2%), polarization extinction ratio (>20 dB for linear-polarized variants), and spectral FWHM (measured via scanning Fabry–Pérot interferometer). The system meets requirements for GLP-compliant laboratories under ISO/IEC 17025:2017 for optical source validation.

Software & Data Management

Keopsys provides the KeoControl™ desktop application (Windows/Linux/macOS) for real-time monitoring of laser current, TEC temperature, output power, and fault logs. All operational data—including timestamped power readings, thermal sensor outputs, and alarm events—are stored in HDF5 format with embedded metadata (wavelength, serial number, firmware version). Audit trails comply with FDA 21 CFR Part 11 when used with user authentication and electronic signature modules (optional add-on). Remote operation is supported via TCP/IP socket interface, enabling integration into LabVIEW, Python (PyVISA), or MATLAB-based automated measurement sequences.

Applications

• Seeding high-energy picosecond and femtosecond fiber amplifiers requiring narrow-linewidth, high-SNR pump sources
• High-resolution absorption spectroscopy of atomic vapors (e.g., Yb, Er, Dy) and molecular gases in the near-IR
• Pump source for optical parametric generation (OPG) and optical parametric amplification (OPA) in ZnGeP₂ or GaSe crystals
• Interferometric sensing platforms including fiber-optic hydrophones and distributed acoustic sensing (DAS) systems
• Calibration reference for wavelength meters and optical spectrum analyzers (OSAs) per ISO 13694
• Material processing applications requiring high-brightness 1 µm radiation with controlled spectral content (e.g., selective ablation of thin-film solar cells)

FAQ

Is the CYFL-TERA series suitable for use in cleanroom environments?
Yes—the fully sealed, fanless enclosure and absence of internal air circulation meet ISO Class 5 cleanroom compatibility requirements when mounted on vibration-isolated optical tables.
Can the laser be operated in constant-power mode with external feedback?
Yes—integrated photodiode monitoring enables closed-loop power regulation via analog voltage input (0–5 V corresponds to 0–100% rated power), supporting third-party PID controllers.
What is the maximum allowable back-reflection level at the output port?
<−30 dB is recommended; optional built-in optical isolators (15 dB or 30 dB isolation) are available to protect against destabilization from reflected light.
Does Keopsys provide OEM integration support for embedded control?
Yes—custom firmware development, mechanical housing redesign, and electrical interface adaptation (e.g., LVDS, CAN bus) are available under NDA through Keopsys’ Industrial Solutions Group.
Are calibration certificates provided with each unit?
Yes—each laser ships with a traceable calibration certificate (NIST-traceable power meter and wavemeter), valid for 12 months from date of shipment.