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Demonstration of Self-Starting Nonlinear Mode Locking in Random Lasers
Fabrizio Antenucci1,2, Giovanni Lerario3, Blanca Silva Fernandéz3
1CNR-NANOTEC, Institute of Nanotechnology, Soft and Living Matter Laboratory, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
Physical Review Letters
|May 14, 2021
Summary
Researchers demonstrate nonlinear mode coupling in random lasers, achieving self-starting mode locking without external devices. This breakthrough in ultrafast laser technology opens new avenues for nanostructured device development.
Area of Science:
- Laser Physics
- Nonlinear Optics
- Condensed Matter Physics
Background:
- Ultrafast multimode lasers utilize saturable absorbers or modulators for mode locking, enabling short pulse generation through nonlinear mode interactions.
- Theoretical models predict spontaneous mode locking in random lasers due to nonlinear effects, but experimental evidence has been lacking.
Purpose of the Study:
- To experimentally demonstrate nonlinear mode coupling and self-starting mode locking in random lasers.
- To investigate the role of nonlinear frequency matching in random laser mode locking.
Main Methods:
- Analysis of multimode intensity correlations in random lasers.
- Testing correlations against the nonlinear frequency matching condition for mode coupling.
Main Results:
- Clear evidence of nonlinear mode coupling in random lasers was observed.
- Nontrivially large correlations were found for spatially overlapping resonances, dependent on frequency matching.
- This marks the first experimental realization of self-starting mode locking in random lasers.
Conclusions:
- Nonlinear mode coupling occurs in random lasers, leading to self-starting mode locking.
- This finding advances the understanding of random laser dynamics and nonlinear optical phenomena.
- Enables new developments in the design and application of nanostructured devices for laser technology.
