A straight effective method to produce partially coherent beams with controllable time-dependent coherence is demonstrated. We theoretically deduce that a time-dependent partially coherent beam can be generated by imposing dynamic random phase on a coherent laser beam. The degree of coherence of the beam is determined by an amplitude control parameter of the dynamic random phase. We experimentally corroborate that after a completely coherent laser beam reflected from a spatial light modulator, loaded with a particular dynamic random phase, this beam is transformed into a partially coherent beam with time-dependent coherence.
High energy nanosecond vortex beams and cylindrically polarized beams are generated in Nd:YAG amplifiers. Vortex
seed beams and cylindrically polarized seed beams are converted from a conventional Nd:YAG laser by spiral phase plate
and polarization converter, respectively. Maximum output energy of optical vortex up to 995 mJ and cylindrically
polarized beams up to 772 mJ have been achieved at 10 Hz in a 10-ns pulse, respectively. The amplification efficiency,
the beam quality and pulse width of the amplification output are studied. Both the topological charge of the vortex seed
beams and polarization state of cylindrically polarized beams are confirmed to be conserved during the amplification. The
generation of high energy vortex beams and cylindrically polarized beams would be beneficial to laser material
processing.
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