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Selection in various families of axi-symmetric modes (Laguerre-Gaussian, cylindrical vector and Bessel-like modes with near-diffraction free propagation properties) in an Yb:YAG ceramic laser by manipulating the cavity stability conditions of a lens resonator is reported.
A short-focus glass lens with strong spherical aberration was used for mode selection in the cw LD-end-pumped Yb:YAG ceramic laser. Sequence of low to very high order Laguerre–Gaussian (LG pl ) modes with different combinations of radial, p and azimuthal, l indices (p⩽10, l⩽28), with output beam diameters 2–13mm and power up to 30mW was obtained. Peaked and hollow multi-ring beams with near-diffraction...
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