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Solid-State Red Laser with a Single Longitudinal Mode from Carbon Dots.

Yongqiang Zhang¹, Haoqiang Song¹, Lu Wang¹

¹Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.

Angewandte Chemie (International Ed. in English)

|September 22, 2021

Summary

This summary is machine-generated.

Researchers developed red-emissive carbon dots (CDs) for miniaturized solid-state lasers. These CDs achieve a single longitudinal mode, crucial for photonic applications, by combining doping and surface modification.

Keywords:

carbon dots microcavity red-emissive single longitudinal mode solid-state laser

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Area of Science:

Materials Science
Photonics
Nanotechnology

Background:

Miniaturized solid-state lasers are essential for advanced photonic applications.
Achieving single longitudinal mode operation is critical for laser performance and stability.
Carbon dots (CDs) offer tunable optical properties but require optimization for laser applications.

Purpose of the Study:

To develop red-emissive carbon dots (CDs) for single longitudinal mode solid-state lasers.
To enhance the photoluminescence quantum yield (PLQY) and photostability of CDs.
To integrate CDs into a microcavity for laser fabrication.

Main Methods:

Synthesized red-emissive CDs through graphitic nitrogen doping and surface modification.
Optimized doping concentration and surface functionalization to tune emission and improve PLQY.
Fabricated a planar microcavity laser incorporating the modified CDs.

Main Results:

Achieved red-emissive CDs with a high PLQY of 65.5%.
Demonstrated excellent stimulated emission with a low amplified spontaneous emission (ASE) threshold and long gain lifetime.
Constructed a single longitudinal mode solid-state laser with a narrow linewidth (0.14 nm) and high signal-to-noise ratio (14.8 dB, Q~4600).

Conclusions:

The developed red-emissive CDs are suitable for single longitudinal mode solid-state lasers.
Graphitic nitrogen doping and surface modification are effective strategies for enhancing CD optical properties.
This work advances the development of colorful solid-state micro/nano lasers for practical photonics.