Silva João L, Crespo Helder M, Weigand Rosa
Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal.
Appl Opt. 2011 May 10;50(14):1968-73. doi: 10.1364/AO.50.001968.
The generation of ultrashort vacuum UV (VUV) pulses by nondegenerate cascaded four-wave mixing of femtosecond pulses in a thin slide of a large band-gap transparent solid is numerically demonstrated. Using a novel noncollinear multiple-beam configuration, cascaded four-wave mixing of amplified 30 fs Ti:sapphire laser pulses at 800 nm, and their second harmonic in lithium fluoride results in the generation of VUV radiation down to 134 nm with energies in the μJ range and durations comparable to those of the pump pulses. The proposed geometry is advantageous in large dispersion scenarios, namely for generating radiation close to absorption bands. Hence these results set this technique as a promising way to efficiently generate ultrashort VUV radiation in solids for several applications in science and technology.
通过飞秒脉冲在大带隙透明固体薄片中的非简并级联四波混频产生超短真空紫外（VUV）脉冲，这一过程在数值上得到了证明。使用一种新颖的非共线多光束配置，800 nm的30 fs放大钛宝石激光脉冲及其在氟化锂中的二次谐波进行级联四波混频，可产生低至134 nm的VUV辐射，其能量在μJ范围内，持续时间与泵浦脉冲相当。所提出的几何结构在大色散情况下具有优势，即在靠近吸收带处产生辐射。因此，这些结果将该技术确立为一种在固体中高效产生超短VUV辐射的有前途的方法，可用于科学和技术中的多种应用。
