title: Broadband sum-frequency generation using d33in periodically poled LiNbO3thin film in the telecommunications band.
abstract: We demonstrate the first, to the best of our knowledge, type-0 broadband sum-frequency generation (SFG) based on single-crystal periodically poled LiNbO3(PPLN) thin film. The broad bandwidth property was largely tuned from mid-infrared region to the telecommunications band by engineering the thickness of PPLN from bulk crystal to nanoscale. It provides SFG a solution with both broadband and high efficiency by using the highest nonlinear coefficient d33instead of d31in type-I broadband SFG or second-harmonic generation. The measured 3 dB upconversion bandwidth is about 15.5 nm for a 4 cm long single crystal at 1530 nm wavelength. It can find applications in chip-scale spectroscopy, quantum information processing, LiNbO3-thin-film-based microresonator and optical nonreciprocity devices, etc.
authors.forename: Guangzhen
authors.initials: G
authors.lastname: Li
authors.forename: Yuping
authors.initials: Y
authors.lastname: Chen
authors.forename: Haowei
authors.initials: H
authors.lastname: Jiang
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Chen