Abstract
High-power cylindrical vector beams (CVBs) in the form of Laguerre-Gaussian (LG0,l) with fixed topological charge and desirable state of polarization (SoP) have been widely needed for various applications such as quantum communication, optical trapping, manipulating microparticles, laser machining, and high-resolution imaging. Highly efficient high-order CVBs with fixed topological charge and SoP generated in solid-state lasers are desirable for various applications. Here, by adjusting annular pump beam waist and distance between focus spot and gain medium, we directly generated LG0,l (l = 2, 3, 4) CVBs with SoP in the form of E0,l(ϕ,r) = - Eϕ ×sin[(l + 1)ϕ]+ Er ×cos[(l + 1)ϕ] in a highly efficient Yb3+:Y3Al5O12 (Yb:YAG) microchip laser. The LG0,4 CVB is obtained when the input pump power is higher than 2.9 W and keeps as the input pump power further increases. The output power of the LG0,4 cylindrical vector laser is 1.3 W at the input pump power of 6.1 W. The optical conversion efficiency is as high as 21.3%. Polarization purity is over 93% for LG0,4 CVB generated in the Yb:YAG microchip laser.
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