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We demonstrate a broadband optical parametric oscillation,using a sheet cavity,via cavity phase-matching.A 21.2 THz broad comb-like spectrum is achieved,with a uniform line spacing of 133.0 GHz,despite a relatively large dispersion of 275.4fs2/mm around 1064nm.With 22.6% high slope efficiency,and 14.9kW peak power handling,this sheet optical parametric oscillator can be further developed for x(2) comb.