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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Unidirectional Lasing from Mirror-Coupled Dielectric Lattices.

Guanyue Zhao¹, Xinyu Gao¹, Yufeng Zhou¹

¹Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.

|March 8, 2024

Summary

Researchers developed a hybrid system for unidirectional lasing using dielectric lattices on metal mirrors. This method creates high-quality lattice resonances, enabling efficient light feedback for laser applications.

Keywords:

bound states in the continuum dielectric nanoparticles directionality finite size lasing mirror-image model surface lattice resonances

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Area of Science:

Photonics
Materials Science
Optics

Background:

High-quality optical resonances are crucial for laser development.
Achieving strong light confinement away from metal surfaces is challenging due to losses.

Purpose of the Study:

To demonstrate a hybrid system for high-quality lattice resonances.
To achieve unidirectional lasing using these resonances.
To investigate the underlying physics of the observed resonances.

Main Methods:

Fabrication of transparent dielectric nanoparticle arrays (TiO2) on a metal mirror (Ag).
Utilizing a mirror-image model to analyze resonance formation.
Characterizing lattice resonances and demonstrating lasing under optical pumping.

Main Results:

Observed high-quality lattice resonances with quality factors up to 2750 in the visible spectrum.
Demonstrated unidirectional lasing with small array sizes (100 μm × 100 μm).
Localized enhanced electromagnetic fields within the dielectric structures, away from the metal mirror.

Conclusions:

The hybrid dielectric-metal system effectively generates bound states in the continuum for high-quality resonances.
This approach enables efficient unidirectional lasing with potential for broader spectral applications.
The scheme offers simultaneous strong surface field enhancement and high quality factors.