Singly resonant optical parametric oscillator in periodically poled KTiOPO4 pumped by a Bessel beam

• Conical pumping was used in a periodically poled KTiOPO4 optical parametric oscillator for singly resonant idler generation in a nearly diffraction-limited axial beam. A single signal-idler pair was generated over the whole tuning range by use of asymmetric reflectivity of the OPO mirrors. Pump depletion of 40% and total conversion efficiency of 27% were obtained. Additional OPO tuning capability was demonstrated by adjustment of the angle of the conical pump beam.

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