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Pockels soliton microcomb

https://doi.org/10.1038/s41566-020-00704-8

Bruch, Alexander W.; Liu, Xianwen; Gong, Zheng; Surya, Joshua B.; Li, Ming; Zou, Chang-Ling; Tang, Hong X. (January 2021, Nature Photonics)

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Cavity electro-optic circuit for microwave-to-optical conversion in the quantum ground state

https://doi.org/10.1103/PhysRevA.103.053504

Fu, Wei; Xu, Mingrui; Liu, Xianwen; Zou, Chang-Ling; Zhong, Changchun; Han, Xu; Shen, Mohan; Xu, Yuntao; Cheng, Risheng; Wang, Sihao; et al (May 2021, Physical Review A)

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Widely separated optical Kerr parametric oscillation in AlN microrings

https://doi.org/10.1364/OL.384317

Tang, Yulong; Gong, Zheng; Liu, Xianwen; Tang, Hong_X (February 2020, Optics Letters)

Here, we report ${χ<#comment/>}^{(3)}$ -based optical parametric oscillation (OPO) with widely separated signal–idler frequencies from crystalline aluminum nitride microrings pumped at $2 µ<#comment/> m$ . By tailoring the width of the microring, OPO reaching toward the telecom and mid-infrared bands with a frequency separation of 64.2 THz is achieved. While dispersion engineering through changing the microring width is capable of shifting the OPO sideband by $><#comment/> 9 T H z$ , the OPO frequency can also be agilely tuned in the ranges of 1 and 0.1 THz, respectively, by shifting the pump wavelength and controlling the chip’s temperature. At high pump powers, the OPO sidebands further evolve into localized frequency comb lines. Such large-frequency-shift OPO with flexible wavelength tunability will lead to enhanced chip-scale light sources.
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Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide

https://doi.org/10.1038/s41467-019-11034-x

Liu, Xianwen; Bruch, Alexander W.; Lu, Juanjuan; Gong, Zheng; Surya, Joshua B.; Zhang, Liang; Wang, Junxi; Yan, Jianchang; Tang, Hong X. (December 2019, Nature Communications)

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Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W

https://doi.org/10.1364/OPTICA.6.001455

Lu, Juanjuan; Surya, Joshua B.; Liu, Xianwen; Bruch, Alexander W.; Gong, Zheng; Xu, Yuntao; Tang, Hong X. (November 2019, Optica)
Stokes and anti-Stokes Raman scatterings from frequency comb lines in poly-crystalline aluminum nitride microring resonators

https://doi.org/10.1364/OE.27.022246

Jung, Hojoong; Gong, Zheng; Liu, Xianwen; Guo, Xiang; Zou, Chang-ling; Tang, Hong X. (July 2019, Optics Express)
Efficient and tunable blue light generation using lithium niobate nonlinear photonics

https://doi.org/10.1063/5.0071769

Sayem, Ayed Al; Wang, Yubo; Lu, Juanjuan; Liu, Xianwen; Bruch, Alexander W.; Tang, Hong X. (December 2021, Applied Physics Letters)
Ultra-high-Q UV microring resonators based on a single-crystalline AlN platform

https://doi.org/10.1364/OPTICA.5.001279

Liu, Xianwen; Bruch, Alexander W.; Gong, Zheng; Lu, Juanjuan; Surya, Joshua B.; Zhang, Liang; Wang, Junxi; Yan, Jianchang; Tang, Hong X. (October 2018, Optica)
17 000%/W second-harmonic conversion efficiency in single-crystalline aluminum nitride microresonators

https://doi.org/10.1063/1.5042506

Bruch, Alexander W.; Liu, Xianwen; Guo, Xiang; Surya, Joshua B.; Gong, Zheng; Zhang, Liang; Wang, Junxi; Yan, Jianchang; Tang, Hong X. (September 2018, Applied Physics Letters)

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