Abstract
Dual-vortex laser beams have been achieved in a decentered annular beam pumped Nd:YAG/Cr4+:YAG composite crystal passively Q-switched microchip laser (PQSML). The orientation and separation between two holes in dual-vortex lasers have been controlled by adjusting the offset of collimating lens with respect to the optical axis of the pump light from fiber-coupled laser diode. The offset of the collimating lens has nearly negligible effect on the performance of the decentered annular beam pumped dual-vortex Nd:YAG/Cr4+:YAG PQSML. The optical efficiency of 15.5% is achieved for dual-vortex lasers, which is comparable to that for doughnut-shaped vortex laser under normal incident pumping. Pulse width is 3.6 ns and peak power is over 5 kW for dual-vortex lasers with controllable orientation and separation between two holes. The short pulse high peak power dual-vortex lasers with controllable orientation and separation between two holes have potential applications in manipulating microparticles, data storage and quantum information processing.
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