Four-Ce:Nd:YAG-rod solar laser with 4.49% conversion efficiency through Fresnel lens.
Hugo Costa1, Dawei Liang2, Joana Almeida1
1Department of Physics, Centre of Physics and Technological Research, NOVA School of Science and Technology, 2829-516, Caparica, Portugal.
Scientific Reports
|April 17, 2025
Summary
A new solar laser prototype using a Fresnel lens achieved a record 4.49% solar-to-laser efficiency, emitting four beams simultaneously. This cost-effective system demonstrates potential for practical renewable energy applications.
Area of Science:
- Renewable Energy Technologies
- Optics and Photonics
- Materials Science
Background:
- Developing efficient and cost-effective solar laser systems is crucial for renewable energy.
- Previous solar laser systems often relied on complex designs or expensive components.
Purpose of the Study:
- To assess the performance of a novel solar laser prototype utilizing a Fresnel lens.
- To demonstrate the feasibility of a multirod system for sustained solar laser operation.
Main Methods:
- The prototype featured an aspheric lens, conical pump cavity, and four end-side pumped Ce:Nd:YAG rods.
- Performance was evaluated in the focal zone of a Fresnel lens.
- Laser output and stability were measured under varying solar conditions.
Main Results:
- The system simultaneously emitted four laser beams with a total power of 22.46 W.
- Achieved a record solar-to-laser power conversion efficiency of 4.49% (16% increase).
- Attained a slope efficiency of 6.76% (7% enhancement) and sustained operation for 112 seconds without solar tracking.
Conclusions:
- The multirod solar laser system with a Fresnel lens offers a competitive and economical alternative to parabolic mirror systems.
- This technology represents a significant advancement in efficient solar energy conversion.
- The system's performance highlights its potential for practical, cost-effective renewable energy generation.
