The generation of a 33.7 W radially polarized output is demonstrated by way double-pass amplification in Ho:YAG thin-slab crystal. amplifier system was seeded with the beam from continuous-wave 13.2 W, 2.1 µm rod laser, which exploited gain medium bifocusing and ring-shaped pump spot to promote preferential lasing on Laguerre–Gaussian mode. By compensating for both thermally induced stress bire...

We present a detailed study of the fields and propagation characteristics around focus ultrashort radially-polarized laser beams (RPLBs) having low-order spatio-temporal couplings (STCs). The three STCs considered are focusing different frequencies to positions along longitudinal coordinate, one transverse beam waist or Rayleigh range power-law frequency dependence. deemed because they generall...