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High-beam-quality low-resistance vertical-cavity surface-emitting laser array with graphene electrode
Optics Express
|March 5, 2024
Summary
Graphene electrodes significantly improve vertical-cavity surface-emitting laser (VCSEL) arrays by reducing resistance and self-heating. This novel design enhances beam quality and power, offering a new method for high-performance VCSEL arrays.
Area of Science:
- Optoelectronics
- Materials Science
Background:
- Thermal crosstalk and current crowding degrade vertical-cavity surface-emitting laser (VCSEL) array performance.
- Existing VCSEL array designs face challenges in maintaining beam quality and efficiency.
Purpose of the Study:
- To design a novel VCSEL array utilizing graphene electrodes for improved vertical current injection.
- To suppress thermal crosstalk and enhance array beam quality and power.
Main Methods:
- Graphene electrodes were integrated into VCSEL arrays to leverage their superior current transmission.
- Current transport direction was controlled to minimize series resistance and self-heating.
- Active region current density was optimized for improved beam quality.
Main Results:
- The novel graphene electrode VCSEL (Gr-VCSEL) array exhibited a 41% reduction in series resistance compared to traditional designs.
- A side mode suppression ratio of 32 dB and a divergence angle of approximately 12° were achieved.
- Quasi-single mode emission and effective suppression of thermal crosstalk were demonstrated.
Conclusions:
- Graphene electrodes provide an effective solution for reducing series resistance and self-heating in VCSEL arrays.
- The Gr-VCSEL array design enables high-power, quasi-single mode emission with improved beam quality.
- This approach offers a promising new direction for developing advanced VCSEL arrays.
