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Related Experiment Video

Updated: May 29, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Hybridized Soliton Lasing in Coupled Semiconductor Lasers.

Theodore P Letsou^1,2, Dmitry Kazakov¹, Pawan Ratra^1,3

¹Harvard University, Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|February 6, 2025

Summary

Coupling two semiconductor ring lasers creates complex optical states, including a frequency comb with simultaneous bright and dark solitons. This chip-scale system demonstrates novel light behaviors not seen in single lasers.

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Area of Science:

Photonics and optical engineering
Nonlinear optics
Quantum optics

Background:

Coupling is fundamental to creating complex systems in nature.
Understanding coupled optical systems is key to developing advanced photonic devices.

Purpose of the Study:

To demonstrate a chip-scale coupled laser system exhibiting complex optical states.
To investigate the unique properties of hybridized modes in coupled cavities.

Main Methods:

Fabrication and characterization of a coupled semiconductor ring laser system.
Experimental coherent waveform reconstruction to analyze optical states.
Analysis of frequency comb generation and soliton dynamics.

Main Results:

A coupled laser system spontaneously forms a frequency comb with phase-locked, anticrossing modes.
Bright and dark picosecond solitons circulate simultaneously within the coupled cavity.
Breathing bright solitons temporally overlap with dark solitons, a novel state.

Conclusions:

Coupling laser elements breaks conventional rules for light states, enabling new optical phenomena.
This work paves the way for designing intricate networks of coupled on-chip lasers.
Demonstrates the potential for complex, engineered optical states through system coupling.