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Updated: Nov 10, 2025
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
7.8K
Ultrafast 3.5 µm fiber laser.
Optics Letters
|April 1, 2021
Summary
Researchers developed a novel mode-locked fiber laser operating beyond 3 µm in the femtosecond regime. This breakthrough enables new possibilities for mid-infrared spectroscopy and applications.
Area of Science:
- Physics
- Optics
- Laser Technology
Background:
- Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
- Extending laser operation to longer wavelengths (beyond 3 µm) opens new spectral windows for various applications.
Purpose of the Study:
- To demonstrate the first mode-locked fiber laser operating in the femtosecond regime beyond 3 µm.
- To characterize the performance of this novel laser system.
Main Methods:
- Utilized dual-wavelength pumping to achieve laser operation.
- Employed nonlinear polarization rotation for mode-locking.
- Designed a fiber laser cavity for mid-infrared output.
Main Results:
- Achieved stable femtosecond pulse generation at a 3.5 µm wavelength.
- Minimum pulse duration of 580 fs was recorded.
- Operated at a repetition rate of 68 MHz with a pulse energy of 3.2 nJ, yielding a peak power of 5.5 kW.
Conclusions:
- Successfully developed a pioneering mode-locked fiber laser in the femtosecond regime beyond 3 µm.
- The laser's performance characteristics make it suitable for mid-infrared applications.
- This work expands the capabilities of fiber laser technology for scientific research.
