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arXiv · 2512.16350

Three-Octave Supercontinuum Generation Spanning from Ultraviolet in Lithium Tantalate Waveguides

Lingfang Wang·Tianyou Tang·Huizong Zhu·Juanjuan Lu
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Abstract

We demonstrate, for the first time, supercontinuum generation spanning more than three octaves in dispersion-engineered thin-film lithium tantalate (TFLT) waveguides. Pumped by a femtosecond laser at 1560 nm, the waveguides yield a spectrum from 240 nm in the ultraviolet to beyond 2400 nm in the near-infrared. The spectral evolution is mapped from low-power harmonic generation (second- and third-harmonic) to a high-power continuum driven by soliton fission and dispersive wave emission. This first demonstration of ultrabroadband nonlinear optics in TFLT establishes it as a competitive, low-loss platform for integrated photonics, with significant potential for applications in frequency metrology and on-chip spectroscopy.

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Lingfang Wang, Tianyou Tang, Huizong Zhu, Juanjuan Lu. 2025-12-18. Three-Octave Supercontinuum Generation Spanning from Ultraviolet in Lithium Tantalate Waveguides. https://arxiv.org/abs/2512.16350

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