Broadband Sheet Parametric Oscillator for χ (2) Optical Frequency Comb Generation via Cavity Phase MatchingSupported by the National Key Research and Development Program of China (Grant Nos. 2019YFA0705000 and 2017YFA0303700), the Key R&D Program of Guangdong Province (Grant No. 2018B030329001), the Leading-Edge Technology Program of Jiangsu Natural Science Foundation (Grant No. BK20192001), and the National Natural Science Foundation of China

Abstract

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 275.4 fs2/mm around 1064 nm. With 22.6% high slope efficiency, and 14.9 kW peak power handling, this sheet optical parametric oscillator can be further developed for χ (2) comb.