TY - JOUR
T1 - Efficient Frequency Doubling with Active Stabilization on Chip
AU - Chen, Jia Yang
AU - Tang, Chao
AU - Jin, Mingwei
AU - Li, Zhan
AU - Ma, Zhaohui
AU - Fan, Heng
AU - Kumar, Santosh
AU - Sua, Yong Meng
AU - Huang, Yu Ping
N1 - Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/11
Y1 - 2021/11
N2 - Thin-film lithium niobate (TFLN) is superior for integrated nanophotonics due to its outstanding properties in nearly all aspects: strong second-order nonlinearity, fast and efficient electro-optic effects, wide transparency window, and little two photon absorption and free carrier scattering. Together, they permit highly integrated nanophotonic circuits capable of complex photonic processing by incorporating disparate elements on the same chip. Yet, there has to be a demonstration that synergizes those superior properties for system advantage. Here, such a chip that capitalizes on TFLN's favorable ferroelectricity, high second-order nonlinearity, and strong electro-optic effects is demonstrated. It consists of a monolithic circuit integrating a Z-cut, quasi-phase matched microring with high quality factor and a phase modulator used in active feedback control. By Pound–Drever–Hall locking, it realizes stable frequency doubling at about 50% conversion with only milliwatt pump power. This demonstration addresses a long-outstanding challenge facing cavity-based optical processing, including frequency conversion, frequency comb generation, and all-optical switching, whose stable performance is hindered by photorefractive or thermal effects. These results further establish TFLN as an excellent material capable of optical multitasking, as desirable to build multi-functional chip devices.
AB - Thin-film lithium niobate (TFLN) is superior for integrated nanophotonics due to its outstanding properties in nearly all aspects: strong second-order nonlinearity, fast and efficient electro-optic effects, wide transparency window, and little two photon absorption and free carrier scattering. Together, they permit highly integrated nanophotonic circuits capable of complex photonic processing by incorporating disparate elements on the same chip. Yet, there has to be a demonstration that synergizes those superior properties for system advantage. Here, such a chip that capitalizes on TFLN's favorable ferroelectricity, high second-order nonlinearity, and strong electro-optic effects is demonstrated. It consists of a monolithic circuit integrating a Z-cut, quasi-phase matched microring with high quality factor and a phase modulator used in active feedback control. By Pound–Drever–Hall locking, it realizes stable frequency doubling at about 50% conversion with only milliwatt pump power. This demonstration addresses a long-outstanding challenge facing cavity-based optical processing, including frequency conversion, frequency comb generation, and all-optical switching, whose stable performance is hindered by photorefractive or thermal effects. These results further establish TFLN as an excellent material capable of optical multitasking, as desirable to build multi-functional chip devices.
KW - Pound–Drever–Hall
KW - integrated photonics
KW - lithium niobate
KW - nonlinear optics
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U2 - 10.1002/lpor.202100091
DO - 10.1002/lpor.202100091
M3 - Article
AN - SCOPUS:85116814227
SN - 1863-8880
VL - 15
JO - Laser and Photonics Reviews
JF - Laser and Photonics Reviews
IS - 11
M1 - 2100091
ER -