Abstract
We report a continuous-wave (cw) optical parametric oscillator (OPO) generating optical vortices tunable in the ultraviolet (UV). Based on MgO:sPPLT as the nonlinear crystal, the singly resonant OPO is pumped by a cw vortex beam in the green, and deploying intracavity sum-frequency generation (SFG) between the undepleted pump and the Gaussian resonant signal in the crystal of , it can generate optical vortices of order, and 2, tunable across 332–344 nm in the UV with a maximum power of 12 mW. Due to conservation of orbital angular momentum in the parametric process, the OPO also produces a non-resonant idler output beam in a vortex spatial profile of order and 2, identical to the pump vortex, with the signal beam in Gaussian distribution. The idler vortex is tunable across 1172–1338 nm with maximum output power of 1.3 W.
© 2019 Optical Society of America
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