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Updated: Jun 8, 2025

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Published on: November 5, 2019
Versatile VCSEL source of thermal and super-thermal light
Researchers developed controllable sources of thermal and super-thermal light using vertical cavity surface emitting lasers (VCSELs). These sources offer tunable correlation functions and times, useful for quantum optics applications.
Area of Science:
- Quantum Optics
- Laser Physics
Background:
- Controllable generation of non-classical light states is crucial for quantum technologies.
- Vertical cavity surface emitting lasers (VCSELs) offer a compact and scalable platform for light generation.
Purpose of the Study:
- To develop highly controllable sources of thermal and super-thermal light.
- To investigate the influence of noise and driving current on light properties.
Main Methods:
- Utilizing single-mode (SM) and multi-mode (MM) VCSELs driven by a noisy current above threshold.
- Varying average driving current, noise amplitude, and bandwidth.
Main Results:
- Achieved robust generation of light with tunable temporal second-order intensity correlation functions up to 2.5.
- Demonstrated control over correlation times ranging from 1 µs to 10 ns.
- Preserved single-mode quality in SM VCSELs and near-single-mode behavior in MM VCSELs.
Conclusions:
- VCSELs provide a versatile platform for generating controllable thermal and super-thermal light.
- Noise engineering in VCSELs allows for precise tuning of light statistical properties.
- The generated light is suitable for applications requiring specific coherence properties.
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