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Noise-like pulse generation in high-power spatiotemporal mode-locked fiber lasers with 41% optical-to-optical
Optics Letters
|September 16, 2025
Summary
A novel spatiotemporal mode-locked (STML) fiber laser achieves high average power (4.1 W) and efficiency (41%) for noise-like pulses. This research enhances understanding of high-power STML lasers for practical applications.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
- Higher power and energy are desirable for various applications.
- Spatiotemporal mode-locking (STML) offers a promising route to achieve these goals.
Purpose of the Study:
- To investigate a noise-like pulse spatiotemporal mode-locked (STML) fiber laser.
- To achieve high average power and optical-to-optical efficiency.
- To characterize beam quality and spectral properties.
Main Methods:
- Utilized a spatiotemporal mode-locked (STML) fiber laser cavity design.
- Employed a multimode fiber laser cavity.
- Analyzed output power, efficiency, beam quality (M²), and spectral bandwidth.
Main Results:
- Achieved an average output power of 4.1 W.
- Reached an optical-to-optical efficiency of up to 41%.
- Obtained good beam quality (Mx²=1.35, My²=1.41) due to beam self-cleaning.
- Measured a 3 dB spectral bandwidth of 54 nm owing to nonlinear spectral broadening and weak filtering.
Conclusions:
- Demonstrated a high-power noise-like pulse STML fiber laser.
- Highlighted the benefits of beam self-cleaning for output beam quality.
- Confirmed the potential of STML fiber lasers for practical, high-power applications.
