Doughnut-Shaped and Top Hat Solar Laser Beams Numerical Analysis

Aside from the industry-standard Gaussian intensity profile, top hat and non-conventional laser beam shapes, such as doughnut-shaped are ever more required. The profile is well-known for uniformly irradiating target material, significantly reducing heat-affected zones, typical of irradiation, whereas has attracted much interest its use in trapping particles at nanoscale improving mechanical performance during laser-based 3D metal printing. Solar-pumped lasers can be a cost-effective sustainable alternative to accomplish these useful distributions. sunlight was collected concentrated by six primary Fresnel lenses, folding mirror collectors, further compressed with secondary fused silica concentrators, symmetrically distributed twisted light guides around 5.5 mm diameter, 35 length Nd:YAG rod inside cylindrical cavity. A (Mx2 = 1.25, My2 1.00) computed through both ZEMAX® LASCAD® analysis, 9.4 W/m2 TEM00 mode power collection 0.99% solar-to-TEM00 conversion efficiencies. By using 5.8 solar 1.90, observed. 9.8 1.03% efficiencies were also attained, corresponding an increase 2.2 1.9 times, respectively, compared state-of-the-art experimental records. As far we know, first numerical simulation profiles reported here, contributing understanding formation profiles.