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Dichromatic "Breather Molecules" in a Mode-Locked Fiber Laser
Yudong Cui1,2,3, Yusheng Zhang4, Lin Huang5
1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Physical Review Letters
|April 28, 2023
Summary
Dichromatic breather molecules (DBMs) were created in a fiber laser, exhibiting robust out-of-phase vibrations. Numerical simulations confirmed these findings, linking Q-switching instability to breathing oscillations in ultrafast lasers.
Area of Science:
- Nonlinear optics
- Laser physics
- Quantum optics
Background:
- Bound states of solitons, termed
- molecules
- are crucial in fiber lasers, optical emulation, encoding, and communications.
- Soliton interactions and breathing dynamics are key in nonlinear dissipative systems with applications in spectroscopy.
Purpose of the Study:
- To create and investigate dichromatic breather molecules (DBMs) in a synchronized mode-locked fiber laser.
- To analyze the temporal evolution and intrinsic modes of DBMs.
- To numerically model DBM formation and dynamics.
Main Methods:
- Experimental generation of DBMs in a synchronized mode-locked fiber laser.
- Real-time delay-shifting interference spectra measurement for temporal evolution analysis.
- Numerical modeling using population inversion equations and cross-phase-modulation-coupled complex Ginzburg-Landau equations.
Main Results:
- Robust out-of-phase vibrations identified as a characteristic intrinsic mode of DBMs.
- Successful numerical reproduction of DBM bound states.
- Demonstration that Q-switching instability triggers breathing oscillations.
Conclusions:
- DBMs exhibit intrinsic out-of-phase vibrational modes.
- Numerical models confirm experimental observations of DBMs.
- Q-switching instability is a key factor in initiating breathing oscillations in DBMs, offering new avenues for ultrafast laser design.
