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Tunable 300 W single-frequency 2 μm fiber amplifier.
Optics Letters
|December 24, 2025
Summary
This study introduces a tunable, all-fiber thulium-doped fiber amplifier. It delivers high-power, single-frequency output across a broad wavelength range, demonstrating efficient performance up to 2085 nm.
Area of Science:
- Laser Physics
- Optical Engineering
Background:
- High-power fiber amplifiers are crucial for various scientific and industrial applications.
- Thulium (Tm)-doped fiber amplifiers offer potential for operation in the 2-micron wavelength region.
Purpose of the Study:
- To develop and characterize a high-power, tunable, all-fiber thulium-based fiber amplifier.
- To extend the operational bandwidth of Tm-doped amplifiers to longer wavelengths.
Main Methods:
- Utilized a multi-stage amplifier design incorporating both Tm-doped and Tm/Ho-doped gain fibers.
- Employed longer sections of Tm fiber to enhance bandwidth extension.
- Characterized output power, spectral properties, amplified spontaneous emission (ASE) content, and beam quality (M²).
Main Results:
- Achieved tunable output from 1992-2065 nm with 300-350 W of single-frequency (<100 kHz linewidth) power.
- Delivered over 180 W up to 2085 nm with less than 10% ASE without spectral filters.
- Observed efficiencies of approximately 55% across the operational bandwidth.
- Reported an average M² value of 1.39 at high power, with estimates of pedestal light and higher-order mode content.
Conclusions:
- The developed all-fiber Tm-based amplifier design successfully extends high-power operation to longer wavelengths (>2050 nm).
- The amplifier demonstrates efficient and tunable output, suitable for applications requiring high-power, narrow-linewidth sources in the 2-micron range.
- ASE management becomes critical beyond 2085 nm, indicating a limit for this specific configuration.
