Stable Emissions from a Four-Rod Nd:YAG Solar Laser with ±0.5° Tracking Error Compensation Capacity

Author:

Catela Miguel1ORCID,Liang Dawei1ORCID,Almeida Joana1ORCID,Costa Hugo1ORCID,Garcia Dário1ORCID,Tibúrcio Bruno D.1ORCID,Guillot Emmanuel2ORCID,Vistas Cláudia R.1ORCID

Affiliation:

1. Centre of Physics and Technological Research (CEFITEC), School of Science and Technology, Campus da Caparica, New University of Lisbon, 2829-516 Caparica, Portugal

2. PROMES-CNRS, 7 Rue du Four Solaire, 66120 Font-Romeu-Odeillo-Via, France

Abstract

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.

Funder

Science and Technology Foundation of the Portuguese Ministry of Science, Technology and Higher Education

Solar Facilities for European Research Area—Third Phase

Publisher

MDPI AG

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics

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