Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field

doi:10.1088/1674-1056/23/4/043202

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 43202-043202.doi: 10.1088/1674-1056/23/4/043202

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field

张刚台

Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China

收稿日期:2013-09-09 修回日期:2013-10-07 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
Project supported by the Science Foundation of Baoji University of Arts and Sciences, China (Grant No. ZK11061) and the Natural Science Foundation of Education Committee of Shaanxi Province, China (Grant No. 2013JK0637).

Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field

Zhang Gang-Tai (张刚台)

Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China

Received:2013-09-09 Revised:2013-10-07 Online:2014-04-15 Published:2014-04-15
Contact: Zhang Gang-Tai E-mail:gtzhang79@163.com
About author:32.80.Rm; 42.65.Ky; 42.65.Re
Supported by:
Project supported by the Science Foundation of Baoji University of Arts and Sciences, China (Grant No. ZK11061) and the Natural Science Foundation of Education Committee of Shaanxi Province, China (Grant No. 2013JK0637).

摘要/Abstract

摘要： We present a theoretical investigation of high-order harmonic generation in a chirped two-color laser field, which is synthesized by a 10-fs/800-nm fundamental chirped pulse and a 10-fs/1760-nm subharmonic pulse. It is shown that a supercontinuum can be produced using the multicycle two-color chirped field. However, the supercontinuum reveals a strong modulation structure, which is not good for the generation of an isolated attosecond pulse. By adding a static electric field to the multicycle two-color chirped field, not only the harmonic cutoff is extended remarkably, but also the quantum paths of the high-order harmonic generation (HHG) are modified significantly. As a result, both the extension of the supercontinuum and the selection of a single quantum path are achieved, producing an isolated 23-as pulse with a bandwidth of about 170.6 eV. Furthermore, the influences of the laser intensities on the supercontinuum and isolated attosecond pulse generation are investigated.

关键词: high-order harmonic, attosecond pulse generation, supercontinuum, combined field

Abstract: We present a theoretical investigation of high-order harmonic generation in a chirped two-color laser field, which is synthesized by a 10-fs/800-nm fundamental chirped pulse and a 10-fs/1760-nm subharmonic pulse. It is shown that a supercontinuum can be produced using the multicycle two-color chirped field. However, the supercontinuum reveals a strong modulation structure, which is not good for the generation of an isolated attosecond pulse. By adding a static electric field to the multicycle two-color chirped field, not only the harmonic cutoff is extended remarkably, but also the quantum paths of the high-order harmonic generation (HHG) are modified significantly. As a result, both the extension of the supercontinuum and the selection of a single quantum path are achieved, producing an isolated 23-as pulse with a bandwidth of about 170.6 eV. Furthermore, the influences of the laser intensities on the supercontinuum and isolated attosecond pulse generation are investigated.

Key words: high-order harmonic, attosecond pulse generation, supercontinuum, combined field

中图分类号: (Multiphoton ionization and excitation to highly excited states)

32.80.Rm

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)

张刚台. Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field[J]. 中国物理B, 2014, 23(4): 43202-043202.

Zhang Gang-Tai (张刚台). Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field[J]. Chin. Phys. B, 2014, 23(4): 43202-043202.

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Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field

Isolated sub-30-attosecond pulse generation using a multicycle two-color chirped laser and a static electric field

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