Dynamic independence of pulsed antiphased modes

Area of Science:

• Nonlinear optics
• Quantum optics
• Laser physics

Background:

• Intracavity second-harmonic generation (SHG) is a key process for frequency conversion.
• Self-pulsing instabilities can arise in lasers, leading to complex dynamics.
• Orthogonal polarizations in lasers can exhibit coupled or independent behaviors.

Purpose of the Study:

• To theoretically investigate antiphase dynamics in a self-pulsing intracavity SHG system.
• To explore the conditions under which orthogonal polarizations exhibit nonreciprocal behavior.
• To analyze the emergence of chaotic dynamics in one polarization while another remains periodic.

Main Methods:

• Theoretical analysis of a mathematical model for intracavity SHG.
• Investigation of antiphase dynamics in the self-pulsing regime.
• Numerical simulations to observe polarization behavior and mode dynamics.

Main Results:

• Antiphase dynamics can lead to nonreciprocal independence between orthogonal polarizations due to partial pulse overlap.
• In a system with two modes of one polarization and one of the orthogonal polarization, distinct dynamics were observed.
• The two modes of one polarization can exhibit chaotic behavior, while the single orthogonal mode remains periodic, despite mode coupling.

Conclusions:

• Partial pulse overlap in self-pulsing SHG is a crucial factor for achieving nonreciprocal polarization dynamics.
• The observed phenomenon demonstrates a route to complex, mixed chaotic and periodic behaviors in coupled optical systems.
• This theoretical insight offers potential for controlling light polarization and generating complex light patterns in lasers.