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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Diverse mode operation fiber laser mode-locked by nonlinear multimode interference.

Gang Deng, Qiaochu Yang, Silun Du

|March 5, 2024

Summary

This summary is machine-generated.

Researchers developed a novel fiber laser using a nonlinear multimode interference saturable absorber to generate five distinct pulse modes. This versatile laser technology shows promise for ultrafast photonics applications.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Mode-locked lasers are crucial for ultrafast optics.
Developing versatile saturable absorbers is key for controlling laser dynamics.
Nonlinear multimode interference offers unique light-matter interaction possibilities.

Purpose of the Study:

To demonstrate an all-fiber passively mode-locked laser with a novel saturable absorber.
To investigate the generation of multiple pulse modes using this laser.
To explore the potential of nonlinear multimode interference saturable absorbers in ultrafast photonics.

Main Methods:

Utilized a nonlinear multimode interference saturable absorber constructed from graded index multimode fibers.
Operated the laser in an all-fiber, passively mode-locked configuration.
Investigated pulse generation across different dispersion regimes without external filters.

Main Results:

Successfully generated five distinct pulse modes: dissipative soliton, Q-switched rectangular pulse, dissipative soliton resonance, noise-like pulse, and bright-dark pulse pairs.
Characterized the dissipative soliton with high pulse energy (1.15 nJ), broad bandwidth (17.98 nm), and short duration (2.78 ps).
Observed significant pulse durations and energies for dissipative soliton resonance (5.21 ns, 4.53 nJ) and noise-like pulses (48.06 ns, 5.12 nJ).

Conclusions:

The developed nonlinear multimode interference saturable absorber enables versatile pulse generation in fiber lasers.
The laser system demonstrates flexibility in producing various pulse formats, including complex bright-dark pulse pairs.
The hybrid graded index multimode fiber saturable absorber offers scalability and simplicity, making it attractive for ultrafast photonics.