journal article·2026-01

2.7‐Octave Supercontinuum Generation Spanning from Ultraviolet to Near‐Infrared in Thin‐Film Lithium Niobate Waveguides

Minghui Li, Qiankun Li, Yongyuan Chu, Youting Liang, Hairun Guo, Xueying Sun, Hongyang Shi, Xinzhi Zheng, Jintian Lin, Ya Cheng

Advanced Optical Materials· Volume 14· Issue 3
Publisher page

Abstract

Abstract Supercontinuum generation (SCG) with spectral coverage across the full visible and ultraviolet (UV) ranges is crucial for numerous quantum computing and atomic systems. Here, such ultrabroad‐bandwidth SCG is demonstrated in low‐loss thin‐film lithium niobate (TFLN) nanophotonic waveguides fabricated by photolithography‐assisted chemo‐mechanical etching (PLACE) technique, without additionally introducing complex periodic poling. The MgO‐doped waveguides are designed to exhibit anomalous dispersion in the telecom band by tailoring the waveguide thickness, simultaneously enabling dispersive wave emergence, second harmonic, and third harmonic generation to broaden the spectrum. Thanks to the utilization of the strong χ (2) and χ (3) nonlinear processes in the fabricated low‐loss (≈3 dB m −1 ) waveguide, the SCG with a −80‐dB spectral bandwidth as large as 2.7 octaves spanning from 330 to 2250 nm is observed by pumping the waveguide with a 1550‐nm femtosecond pulsed laser with 0.687 nJ, agreeing well with numerical simulation. Meanwhile, the SCG sustains its stable spectral envelope for a long period of time thanks to the mitigation of the photorefractive effect of lithium niobate by doping of MgO. And theoretical simulation is carried out to verify the coherence of the fundamental and second harmonic waves.
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Research context

OpenAlex topics: Photorefractive and Nonlinear Optics · Advanced Fiber Laser Technologies · Nonlinear Photonic Systems

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Ultra‐intense laser Science and Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200444 China

State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China

The Extreme Optoelectromechanics Laboratory (XXL) School of Physics and Electronic Science East China Normal University Shanghai 200241 China

Shanghai Research Center for Quantum Sciences Shanghai 201315 China

Hefei National Laboratory Hefei 230088 China

Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Science and Technology Commission of Shanghai Municipality · Fundamental Research Funds for the Central Universities · Higher Education Discipline Innovation Project · National Postdoctoral Program for Innovative Talents

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