従来よりも1000倍強い水の中での「白色光」発生を実現～水中スーパーコンティニューム生成に新原理～

2025-11-11 分子科学研究所

図1. 非調和二色光励起による水中白色光発生の飛躍的強化の実験結果

＜関連情報＞

• https://www.ims.ac.jp/news/2025/11/1111.html
• https://opg.optica.org/ol/abstract.cfm?doi=10.1364/OL.575734

非調和2色励起による H 2 O 中のスーパーコンティニウム発生の劇的な増強 Dramatic enhancement of supercontinuum generation in H2O by non-harmonic two-color excitation

Tsuneto Kanai, ChengXiang Jin, Hibiki Tsunekawa, Atsunori Sakurai, and Toshiki Sugimoto
Optics Letters  Published: November 11, 2025
DOI:https://doi.org/10.1364/OL.575734

Abstract

We demonstrate a dramatic enhancement of supercontinuum generation (SCG) in liquid H₂O driven by non-harmonic two-color laser fields, where pump and seed frequencies are not integer multiples. This scheme yields a broadband SC spectrum enhanced by approximately three orders of magnitude over the single-color case. Systematic experiments and theoretical analysis, including isotope effects, show that the enhancement arises from soliton compression with resonant dispersive wave (RDW) emission, phase- and group-velocity-matched four-wave mixing (FWM), and cross-phase modulation (XPM), offering a versatile route to stronger SCG and noise suppression in broadband spectroscopy in H₂O, an emerging topic in attosecond and surface physics.