We present a hybrid waveguide-fiber optical parametric oscillator (OPO)
exploiting degenerate four-wave mixing in tantalum pentoxide. The OPO, pumped
with ultrashort pulses at 1.55 μm wavelength, generated tunable idler
pulses with up to 4.1 pJ energy tunable between 1.63 μm and 1.68 μm
center wavelength. An upper bound for the total tolerable cavity loss of 32 dB
was found, rendering a chip-integrated OPO feasible as a compact and robust
light source.Comment: 5 pages and 5 figures, submitted to Optics Letter