Multipulse dynamics under dissipative soliton resonance conditions.

Area of Science:

• Optics and Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Mode-locked fiber lasers are crucial for generating ultrashort pulses.
• Dissipative soliton resonance (DSR) offers a unique regime for stable pulse generation.
• Understanding multipulse emission dynamics is key to advanced laser applications.

Purpose of the Study:

• To numerically and experimentally investigate stable multipulse emission in an erbium-doped fiber laser operating in the DSR regime.
• To characterize the properties of these multipulses and identify the factors controlling their number.
• To explore the phenomenon termed 'Harmonic Mode-Locking under DSR' (HML under DSR).

Main Methods:

• Numerical simulations of an erbium-doped mode-locked fiber laser.
• Experimental investigation of the laser in the DSR regime.
• Utilizing polarization controllers to tune multipulse emission characteristics.

Main Results:

• Observed stable multipulse emission where all pulses exhibit identical characteristics.
• Demonstrated that the number of pulses is determined by initial conditions and remains constant with increasing pump power.
• Achieved up to 86 dual-wavelength DSR pulses with equal spacing, termed HML under DSR.
• Confirmed that varying polarization controllers allows observation of different numbers of multipulses.

Conclusions:

• The number of DSR pulses is primarily dependent on initial conditions, not pump power.
• The observed phenomenon of HML under DSR provides a method for generating multiple, identical pulses.
• This research offers insights into controlling and optimizing multipulse generation in DSR fiber lasers.