Freely designable optical frequency conversion in Raman-resonant four-wave-mixing process.
Nonlinear optical processes are governed by the relative-phase relationships among the relevant electromagnetic fields in these processes. In this Report, we describe the physics of arbitrary manipulation of Raman-resonant four-wave-mixing process by artificial control of relative phases. As a typical example, we show freely designable optical-frequency conversions to extreme spectral regions, mid-infrared and vacuum-ultraviolet, with near-unity quantum efficiencies. Furthermore, we show that such optical-frequency conversions can be realized by using a surprisingly simple technology where transparent plates are placed in a nonlinear optical medium and their positions and thicknesses are adjusted precisely. In a numerical simulation assuming practically applicable parameters in detail, we demonstrate a single-frequency tunable laser that covers the whole vacuum-ultraviolet spectral range of 120 to 200 nm.
Department of Engineering Science, University of Electro-Communications.
Jian
J
Zheng
1] Department of Engineering Science, University of Electro-Communications [2] JST ERATO-IOS 1-5-1, Chofugaoka, Chofu, Tokyo 182-8585, Japan.
Masayuki
M
Katsuragawa