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Femtosecond pulses at 914 nm without mode-locking using Nd-doped fiber amplifiers
Optics Letters
|February 28, 2025
Summary
This study introduces a novel fiber laser system generating ultrashort femtosecond pulses without mode-locking. The system utilizes picosecond pulse shaping and spectral broadening for efficient femtosecond pulse generation.
Area of Science:
- Laser Physics
- Optical Engineering
Background:
- Mode-locked fiber lasers are common for generating ultrashort pulses.
- Achieving femtosecond pulses often requires complex mode-locking mechanisms.
Purpose of the Study:
- To develop a femtosecond fiber laser system without traditional mode-locking.
- To achieve femtosecond pulse generation at 914 nm using a novel architecture.
Main Methods:
- Utilizing a continuous-wave solid-state laser source and Nd-doped fiber amplifiers.
- Employing picosecond pulse shaping with an electro-optic modulator.
- Implementing a Mamyshev regenerator for pulse compression to 8 ps.
- Inducing spectral broadening via self-phase modulation.
Main Results:
- Generation of femtosecond pulses at 914 nm.
- Achieved pulse duration of 230 fs.
- Obtained a 10 nm output pulse spectrum.
- Demonstrated nearly transform-limited pulse characteristics.
Conclusions:
- A non-mode-locked fiber laser architecture can effectively generate femtosecond pulses.
- The presented method offers a viable alternative for femtosecond pulse generation.
- The system demonstrates potential for applications requiring high-power, ultrashort pulses.
