Keopsys CVFL Series Visible-Doped Fiber Lasers

Overview

The Keopsys CVFL Series represents a family of continuous-wave (CW) visible-doped fiber lasers engineered for high-stability, narrow-linewidth, and diffraction-limited output across the 520–780 nm spectral range. Leveraging Keopsys’ proprietary rare-earth co-doping technology in silica-based photonic crystal fiber architectures, these lasers operate on stimulated emission principles within visible-wavelength-optimized gain media—distinct from frequency-doubled infrared sources. Unlike bulk solid-state or DPSS lasers, the CVFL platform integrates pump diode, active fiber, and all-fiber isolators into a monolithic, alignment-free architecture, delivering exceptional long-term power stability (< ±0.5% over 8 h), low thermal drift, and immunity to mechanical misalignment. Designed for integration into demanding optical systems—including quantum laboratories, life science imaging platforms, and precision metrology setups—the CVFL series meets the stringent requirements of applications where coherence length, polarization fidelity, and spectral purity are non-negotiable.

Key Features

• Four dedicated subfamilies optimized for distinct application domains: CVFL-KILO (atomic cooling), CVFL-MEGA (fundamental quantum optics), CVFL-GIGA-5xx (biotech & medical), and CVFL-GIGA-6xx-7xx (super-resolution microscopy)
• Diffraction-limited beam quality (M² < 1.1) with linear polarization maintained through polarization-maintaining (PM) fiber delivery
• Single-frequency operation (CVFL-KILO & CVFL-MEGA) with side-mode suppression ratio (SMSR) > 60 dB and phase noise < −130 dBc/Hz @ 10 kHz offset
• GIGA variants offer multi-longitudinal-mode (MLM) output with ~20 GHz linewidth—engineered for reduced speckle and enhanced robustness in bioimaging and industrial applications
• Integrated electronic control interface (RS-232, USB, analog modulation input) supporting remote wavelength tuning (KILO/MEGA), frequency modulation (up to 100 MHz), and TTL-triggered pulse gating (short-pulse option)
• Turnkey operation with internal thermal stabilization, automatic power regulation, and real-time monitoring of output power, diode current, and case temperature

Sample Compatibility & Compliance

The CVFL series is fully compatible with standard PM980, HI1060, and LMA-PM fibers via FC/APC or collimated free-space coupling. All models comply with IEC 60825-1:2014 Class 3B laser safety requirements and carry CE marking for EMC (EN 55011) and low-voltage directive (2014/35/EU). For regulated environments—including GLP-compliant biophotonics labs and GMP-aligned medical device manufacturing—the CVFL-MEGA and CVFL-GIGA variants support optional audit-trail-enabled firmware (FDA 21 CFR Part 11 compliant when paired with validated host software). No hazardous substances are used in construction; RoHS 2011/65/EU and REACH SVHC declarations are available upon request.

Software & Data Management

Keopsys provides the CVFL Control Suite—a cross-platform (Windows/macOS/Linux) application enabling full parameter configuration, real-time performance logging, and scriptable automation via Python SDK (PyCVFL). The suite records timestamped datasets including output power history, modulation waveform traces, and thermal sensor readings—exportable in CSV or HDF5 format for traceability. Firmware updates preserve user calibration tables and retain factory-set safety interlocks. Optional LabVIEW VIs and MATLAB Instrument Control Toolbox drivers facilitate integration into existing test benches and automated workflows. All data logs include embedded metadata (serial number, firmware version, UTC timestamps) to satisfy ISO/IEC 17025 documentation requirements.

Applications

• Atomic physics: Rb, K, Yb, and CaF laser cooling and trapping; magneto-optical trap (MOT) seeding; optical lattice loading; Bose-Einstein condensate (BEC) preparation
• Quantum optics: Generation of polarization-entangled photon pairs via SPDC; cavity-enhanced interferometry; optical clock transitions at 578 nm (Yb⁺) and 689 nm (Sr)
• Super-resolution microscopy: STED, RESOLFT, and PALM/STORM excitation at 577 nm (EGFP), 642 nm (mCherry), and 780 nm (IR dye channels)
• Biomedical instrumentation: Flow cytometry illumination, confocal endomicroscopy, ophthalmic photocoagulation (532 nm), and dermatological pigment targeting (577/660 nm)
• Precision metrology: Optical frequency comb stabilization, laser gyroscopes, and absolute distance interferometry requiring long coherence length and low phase jitter

FAQ

What distinguishes CVFL-KILO from CVFL-MEGA?
The CVFL-KILO is a single-frequency, ultra-low-noise laser optimized for atomic cooling, featuring continuous frequency tuning over >1 GHz and sub-Hz linewidth capability. The CVFL-MEGA offers similar coherence but adds dual-wavelength (532/780 nm) operation and enhanced frequency modulation bandwidth—suited for BEC experiments and atom interferometry.
Can CVFL lasers be integrated into OEM systems?
Yes. All CVFL models provide analog/digital modulation inputs, TTL sync outputs, and RS-232/USB control. Mechanical footprints, cooling requirements, and electrical interfaces are documented in the OEM Integration Manual (Rev. 4.2), and custom mounting brackets are available.
Is wavelength calibration traceable to NIST standards?
Factory calibration uses a wavemeter referenced to NIST-traceable iodine absorption lines. A Certificate of Calibration (ISO/IEC 17025 accredited) is optionally available with each unit.
What maintenance is required during operation?
None beyond periodic inspection of fiber connectors and ambient temperature monitoring. The sealed, convection-cooled design eliminates fans, filters, or consumables—typical MTBF exceeds 50,000 hours.
Are safety interlocks configurable for lab-specific protocols?
Yes. The embedded safety controller supports programmable shutter triggers, emergency stop chaining, and configurable power-limit thresholds—all accessible via the CVFL Control Suite or direct register writes.