Stable Emissions from a Four-Rod Nd:YAG Solar Laser with ±0.5° Tracking Error Compensation Capacity
Miguel Catela,
Dawei Liang,
Joana Almeida,
Hugo Costa,
Dário Garcia,
Bruno D. Tibúrcio,
Emmanuel Guillot,
Cláudia R. Vistas
Affiliations
Miguel Catela
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Dawei Liang
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Joana Almeida
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Hugo Costa
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Dário Garcia
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Bruno D. Tibúrcio
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Emmanuel Guillot
PROMES-CNRS, 7 Rue du Four Solaire, 66120 Font-Romeu-Odeillo-Via, France
Cláudia R. Vistas
Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal
Conventional solar-pumped lasers rely on expensive and highly accurate solar tracking systems, which present a significant economic barrier to both solar laser research and practical applications. To address this challenge, an end-side-pumped four-rod solar laser head was designed and built for testing at PROMES-CNRS. Solar radiation was collected and concentrated using a heliostat–parabolic mirror system. A fused silica aspheric lens further concentrated the solar rays into a flux homogenizer within which four Nd:YAG rods were symmetrically positioned around a reflective cone and cooled by water. Four partially reflective mirrors were precisely aligned to extract continuous-wave 1064 nm solar laser power from each laser rod. The prototype demonstrated stable multibeam solar laser operation with the solar tracking system turned on. Even when the tracking system was turned off, the total output power extracted from the solar-pumped laser remained stable for 1 min, representing, to the best of our knowledge, the first successful demonstration of a stable multibeam solar laser operation without solar tracking. For typical solar tracking errors up to ±0.5°, the loss in the total solar laser power produced was only about 1%, representing an 8.0-fold improvement over the previous solar laser experiments under tracking error conditions.