Pulse-spacing manipulation in a passively mode-locked multipulse fiber laser

Area of Science:

• Nonlinear optics
• Laser physics
• Fiber optics

Background:

• Passively mode-locked fiber lasers are widely used but prone to generating multiple disordered pulses due to nonlinear effects.
• Active control of these disordered pulses in passively mode-locked lasers is challenging and underexplored.

Purpose of the Study:

• To experimentally investigate flexible pulse-spacing manipulation in passively mode-locked multipulse fiber lasers.
• To explore both intracavity and extracavity methods for controlling pulse spacing.
• To demonstrate continuous pulse-spacing modulation via external optical injection.

Main Methods:

• Utilized both intracavity and extracavity techniques for pulse-spacing manipulation.
• Employed external optical injection to achieve continuous modulation of pulse spacing.
• Investigated nonlinear dynamics within the fiber laser system.

Main Results:

• Achieved a significant tuning range for pulse spacing, extending up to 1.5 nanoseconds.
• Successfully demonstrated continuous pulse-spacing modulation through external optical injection.
• Validated the effectiveness of the proposed methods in controlling multipulse fiber lasers.

Conclusions:

• The developed methods offer flexible and effective control over pulse spacing in passively mode-locked fiber lasers.
• Continuous pulse-spacing modulation is feasible, opening new avenues for laser applications.
• Findings contribute to understanding laser nonlinear dynamics and optimizing fiber laser performance.