Uniform and Stable TEM00 Mode Multibeam Solar Laser Approach

The utilization of TEM00 mode laser beams is critical in precise material processing, optical communication, and high-resolution imaging. While TEM00 mode solar laser beams have been achieved, the need for a highly accurate and continuously operating solar tracking system presents significant challenges. A solar laser pumping approach is here proposed to enable the production of four uniform and stable TEM00 mode solar laser beams even in the presence of solar tracking errors. The solar radiation was collected and concentrated using a heliostat—parabolic mirror system. An aspheric lens further concentrated the solar rays into a homogenizer that evenly distributed the solar power flux onto four Nd:YAG rods positioned within a single pump cavity. Through Zemax® and LASCAD™ software analysis, successful generation of four uniform and stable 1064 nm continuous-wave solar laser emissions was numerically demonstrated, exhibiting similar TEM00 power levels and beam quality factors. The system showed resilience against solar tracking errors of up to ± 0.2°.