Longhi Stefano
Dipartimento di Fisica and Istituto di Fotonica e Nanotecnologie del CNR, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy.
Opt Lett. 2007 Jul 1;32(13):1791-3. doi: 10.1364/ol.32.001791.
What we believe to be a conceptually novel scheme for third-harmonic generation in engineered quasi-phase-matched chi((2)) optical structures is proposed in which the fundamental-frequency field is directly converted into the third-harmonic field without the intermediate generation of the second-harmonic field. This counterintuitive scheme, which exploits the concept of adiabatic passage and the existence of a nonlinear dark state, bears a close connection to the "stimulated Raman adiabatic passage" technique of population transfer in atomic physics.
我们提出了一种在工程化准相位匹配的χ(2)光学结构中产生三次谐波的概念新颖的方案，其中基频场直接转换为三次谐波场，而无需中间产生二次谐波场。这种违反直觉的方案利用了绝热通道的概念和非线性暗态的存在，与原子物理学中粒子转移的“受激拉曼绝热通道”技术密切相关。
