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Bound states of different pulses based on third-order dispersion
Optics Letters
|May 2, 2019
Summary
Researchers observed novel bound states of double pulses with different wavelengths in a fiber laser. These bound states, featuring distinct pulse durations and peak powers, enrich the understanding of multi-pulse mode-locking dynamics.
Area of Science:
- Nonlinear optics
- Fiber laser physics
Background:
- Passively mode-locked fiber lasers are crucial for generating ultrashort pulses.
- Understanding multi-pulse dynamics, including bound states, is essential for laser design and applications.
- Third-order dispersion significantly influences pulse shaping and stability in mode-locked lasers.
Purpose of the Study:
- To investigate the formation and characteristics of bound states of double pulses in a thulium-doped fiber laser.
- To explore the role of near-zero net cavity group-velocity dispersion and strong third-order dispersion in bound-state formation.
- To reveal a new type of bound-state phenomenon in multi-pulse mode-locking regimes.
Main Methods:
- Experimental observation of bound states in a Tm-doped passively mode-locked fiber laser.
- Utilizing a laser cavity with near-zero net group-velocity dispersion and strong third-order dispersion.
- Numerical simulations to analyze the intra-cavity pulse evolution and dynamics.
Main Results:
- Observation of bound states comprising two pulses with different wavelengths.
- The bound double pulses exhibited distinct pulse durations and peak powers.
- Simulations confirmed differing compression and broadening processes for the two pulses during intra-cavity propagation.
Conclusions:
- Demonstration of a new form of bound states in passively mode-locked fiber lasers.
- The findings enrich the understanding of nonlinear dynamics in multi-pulse mode-locking.
- Highlights the complex interplay between dispersion and pulse interactions in fiber lasers.
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