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Spontaneous pulse temporal position modulation in a bidirectional ultrafast fiber laser
Optics Express
|June 14, 2025
Summary
Researchers achieved spontaneous pulse temporal position modulation in a bidirectional fiber laser using two carbon nanotubes (CNTs) saturable absorbers (SAs). This method offers control over pulse timing in optical systems.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Mode-locked pulses in laser cavities typically maintain constant temporal intervals.
- Controlling pulse timing in ultrafast fiber lasers is crucial for various applications.
Purpose of the Study:
- To investigate spontaneous pulse temporal position modulation.
- To explore the use of carbon nanotubes (CNTs) as saturable absorbers (SAs) in a bidirectional mode-locked fiber laser.
Main Methods:
- Introduction of two CNTs saturable absorbers into a bidirectional mode-locked fiber laser.
- Adjustment of pump power to control pulse behavior.
- Observation of counter-propagating pulse initiation and annihilation.
Main Results:
- Spontaneous pulse temporal position modulation was achieved.
- Two CNTs independently triggered counter-propagating pulses.
- Periodic initiation and annihilation of pulses at different time points were observed.
Conclusions:
- The phenomenon is attributed to CNT colliding mode-locking and gain competition.
- This provides an effective method for controlling pulse temporal position in dissipative optical systems.
- Offers new insights into applications of bidirectional ultrafast fiber lasers.
