Narrow Linewidth Single Frequency Thulium Fiber Laser 1900 to 2100nm

• Ultra-Narrow Linewidth & Low Noise
  – Typical linewidth 10 kHz (max. 15 kHz) for ultra-stable, high-coherence operation
  – Very low phase and frequency noise for demanding coherent applications
  – Low relative intensity noise (RIN) with peak RIN down to -120 dBc/Hz around 400–600 kHz
• Single-Frequency, Single-Longitudinal-Mode Output
  – True CW single-frequency operation with single longitudinal mode
  – No mode-hopping across the specified operating range, ideal for precision metrology and sensing
  – High side-mode suppression ratio (SMSR) ≥ 40–45 dB (50 pm resolution)
• Linear Polarization with High PER
  – Intrinsically linearly polarized output using PM fiber
  – Polarization extinction ratio (PER) typically ≥ 20 dB for polarization-sensitive measurements
  – Output via Panda PM1950 fiber (optional SMF output available)
• Thulium-Doped 2 μm Fiber Laser Source
  – Center wavelength selectable in the 1900–2100 nm band (e.g., 1940 nm, 2050 nm typical)
  – Based on Tm-doped fiber for excellent beam quality and long-term stability
  – Suitable for gas absorption lines and molecular spectroscopy around 2 μm
• Adjustable Output Power with Excellent Stability
  – Output power range from 20 mW to 100 mW
  – 20 mW version fixed; 50 mW and 100 mW versions adjustable
  – Power stability better than ±0.5% typ. (≤ ±1% max) for long-duration experiments
• High Beam Quality & Integrated Optical Isolation
  – Near-diffraction-limited beam with M² ≈ 1.05 (typ.), ≤ 1.1 max
  – Built-in optical isolator with isolation typically 30 dB (≥ 25 dB) to protect the laser from back-reflections
  – Output through FC/APC connector to minimize return loss
• DFB Bragg Grating Technology for Wavelength Stability
  – Distributed Feedback Bragg Grating (DFB) design for inherent single-frequency operation
  – High wavelength stability under temperature and power fluctuations
  – Proprietary packaging for robust, low-noise performance in lab and industrial environments
• Wavelength Tuning & Fast Modulation Options
  – Thermal wavelength tuning range of about 0.6–0.8 nm for coarse adjustment
  – Optional PZT fast modulation for rapid wavelength/frequency scanning
  – Linear modulation frequency range from DC to 10–20 kHz, with modulation range up to 8–10 GHz
• Designed for Coherent LiDAR & Spectroscopy
  – Narrow linewidth and low RIN optimized for coherent LiDAR and FMCW systems
  – High coherence length suitable for high-resolution laser spectroscopy and interferometry
  – Ideal for gas absorption measurements and environmental sensing around 2 μm
• Ready for Frequency Conversion & Nonlinear Optics
  – High spectral purity enables efficient frequency conversion and nonlinear processes
  – Stable single-frequency 2 μm source for mid-IR generation and difference-frequency experiments
  – Suitable pump for optical parametric oscillators (OPOs) and related nonlinear systems
• Laboratory-Friendly Benchtop Design
  – Compact benchtop module: approx. 430 × 450 × 105 mm, weight < 5 kg
  – Universal AC power input: 100–240 V, 50/60 Hz
  – RS232 communication interface for monitoring and remote control
• Robust Environmental Performance
  – Operating temperature range: +15 °C to +40 °C
  – Storage temperature range: -20 °C to +60 °C
  – Engineered for high reliability and long-term, maintenance-free operation
• Configurable Output & Monitoring Options
  – Standard PM fiber output; optional SMF output on request
  – Optional monitoring output for power and stability diagnostics
  – Ordering format supports user-defined wavelength, power level, fiber type, and PZT modulation
• Ideal for Advanced Scientific & Industrial Research
  – Tailored for precision metrology, sensing, atomic and molecular physics
  – Suitable as a local oscillator or seed laser in coherent communication experiments
  – Stable, low-noise platform for integration into complex optical systems

Applications of CoSF-D-Tm-B-LP Narrow Linewidth Single Frequency Fiber Laser

The CoSF-D-Tm-B-LP is a Thulium-doped single-frequency fiber laser with a tunable center wavelength in the 1900–2100 nm range, narrow linewidth (<15 kHz), low phase noise, low RIN, and linearly polarized single-longitudinal-mode output. These characteristics make it ideal for demanding scientific, industrial, and sensing applications where ultra-stable coherent light around 2 µm is required.

1. Frequency Conversion and Nonlinear Optics

• Optical parametric generation and amplification (OPG/OPA): Use as a narrow-linewidth pump source for optical parametric oscillators and amplifiers to generate mid‑infrared (mid‑IR) wavelengths for spectroscopy, defense, and free-space communications.
• Difference-frequency generation (DFG): Provide a stable seed for DFG systems to obtain tunable mid‑IR radiation for gas sensing and molecular fingerprinting.
• Second-harmonic and sum-frequency generation: Drive nonlinear crystals for frequency doubling and mixing to generate coherent radiation at alternative wavelength bands.
• Supercontinuum generation around 2 µm: Seed highly nonlinear fibers to produce broad supercontinuum spectra for calibration sources, metrology, and ultrafast spectroscopy.
• Mid‑IR combs and frequency metrology: Act as a narrow-linewidth source in frequency-comb and precision metrology setups, especially where 2 µm pumping improves conversion efficiency.

2. Coherent LiDAR and 3D Imaging

• Coherent Doppler LiDAR for wind and speed measurement: Use the low-linewidth, low-RIN output as a local oscillator and transmitter for coherent detection in atmospheric wind profiling, aviation safety, and turbine control.
• FMCW LiDAR for high-resolution ranging: Exploit the narrow linewidth and frequency/phase stability for frequency-modulated continuous-wave (FMCW) LiDAR in autonomous platforms, robotics, and infrastructure monitoring.
• Long-range free-space sensing at 2 µm: Benefit from eye-safer operation and reduced atmospheric scattering compared to shorter wavelengths for long-distance ranging and mapping.
• Velocity and vibration sensing: Implement coherent detection schemes for precise velocity, micro‑Doppler, and vibration measurements of mechanical and civil structures.
• Speckle-based 3D imaging: Use stable single-frequency output for speckle and interferometric imaging techniques where phase coherence is essential.

3. High-Resolution Laser Spectroscopy

• High-resolution molecular spectroscopy: Perform Doppler-limited or sub‑Doppler spectroscopy of gases with narrow absorption features in the 1900–2100 nm band (e.g., H2O, CO2, CH4, HF, and other overtone/combination bands).
• Cavity ring-down spectroscopy (CRDS): Use the narrow linewidth laser with high-finesse cavities to achieve extremely low detection limits for trace gas analysis.
• Saturated absorption and frequency locking: Implement saturated absorption spectroscopy and frequency-stabilized locking schemes for ultra-stable reference lasers.
• Photoacoustic spectroscopy (PAS): Drive photoacoustic cells with highly stable CW radiation to enhance sensitivity for environmental and industrial gas monitoring.
• Cavity-enhanced absorption spectroscopy (CEAS): Combine with long-path optical cavities to measure very weak transitions in research and metrology.

4. Gas Absorption Measurement & Environmental Sensing

• Tunable diode laser absorption spectroscopy (TDLAS): Use wavelength tunability and narrow linewidth for selective and quantitative detection of gases such as H2O, CO2, CH4, NH3, and others absorbing near 2 µm.
• In-situ industrial process monitoring: Integrate into process lines and combustion systems to monitor gas composition, temperature, and efficiency in power plants and refineries.
• Atmospheric and climate research: Deploy in field instruments for measuring greenhouse gases, water vapor profiles, and atmospheric pollutants using optical absorption techniques.
• Leak detection and safety monitoring: Implement fixed or portable leak detection systems for pipelines, chemical facilities, and storage tanks, exploiting strong absorption bands near 2 µm.
• Multi-pass cell measurements: Combine with Herriott or White cells for long effective optical path lengths and very low detection limits in laboratory or OEM analyzer platforms.