Efficient high-order harmonic generation boosted by below-threshold harmonics

被引：95

作者：

Brizuela, F. ^{[1
]}

Heyl, C. M. ^{[1
]}

Rudawski, P. ^{[1
]}

Kroon, D. ^{[1
]}

Rading, L. ^{[1
]}

Dahlstrom, J. M. ^{[2
]}

Mauritsson, J. ^{[1
]}

Johnsson, P. ^{[1
]}

Arnold, C. L. ^{[1
]}

L'Huillier, A. ^{[1
]}

机构：

[1] Lund Univ, Dept Phys, SE-22100 Lund, Sweden

[2] Stockholm Univ, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

基金：

欧洲研究理事会; 瑞典研究理事会;

关键词：

STRONG LASER FIELD; TUNNELING IONIZATION; POLARIZATION; PHASE; LIGHT;

D O I：

10.1038/srep01410

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

High-order harmonic generation (HHG) in gases has been established as an important technique for the generation of coherent extreme ultraviolet (XUV) pulses at ultrashort time scales. Its main drawback, however, is the low conversion efficiency, setting limits for many applications, such as ultrafast coherent imaging, nonlinear processes in the XUV range, or seeded free electron lasers. Here we introduce a novel scheme based on using below-threshold harmonics, generated in a "seeding cell", to boost the HHG process in a "generation cell", placed further downstream in the focused laser beam. By modifying the fundamental driving field, these low-order harmonics alter the ionization step of the nonlinear HHG process. Our dual-cell scheme enhances the conversion efficiency of HHG, opening the path for the realization of robust intense attosecond XUV sources.

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页数：5

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