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Coherent waveguide laser arrays in semiconductor quantum well membranes.
Optics Express
|October 15, 2022
Summary
Researchers demonstrate coherent laser arrays on silicon photonics platforms. These waveguide lasers maintain mutual coherence, crucial for integrated photonic circuits.
Area of Science:
- Integrated Photonics
- Semiconductor Lasers
Background:
- Silicon photonics is a key technology for integrated optical circuits.
- Developing coherent laser sources compatible with silicon photonics is essential for advanced applications.
Purpose of the Study:
- To demonstrate coherent laser arrays in a waveguide geometry suitable for silicon photonics.
- To investigate the performance and coherence properties of these laser arrays.
Main Methods:
- Epitaxially grown semiconductor membrane quantum well lasers were fabricated.
- Lasers were transferred onto silicon carbide and oxidized silicon substrates.
- Real and reciprocal space imaging techniques were used to study emission characteristics.
Main Results:
- Lasing thresholds as low as 60 mW of pump power were achieved.
- Waveguide laser arrays with modal widths of 5–10 µm and separations of 10–20 µm were created.
- The laser arrays maintained mutual coherence during operation on single or multiple longitudinal modes.
Conclusions:
- Coherent laser arrays compatible with silicon photonics have been successfully demonstrated.
- The developed waveguide laser arrays exhibit low thresholds and maintain coherence, paving the way for integrated photonic systems.
