Optimization of Single or Range of Harmonics by Using Two Gas Jets

The interference of high-order harmonics generated by two successive gas jets within a single laser pulse is discussed by a modeling with the inclusion of macroscopic propagation of the fundamental and harmonic fields in an ionizing medium. Based on the interference, we show that one can extract the...

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Published inChinese physics letters Vol. 31; no. 6; pp. 106 - 108
Main Author 李小勇 王国利 周效信
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
Carriers
Gas jets
Harmonics
Inclusions
Interference
Lasers
Optimization
Pulse duration
优化
气体射流
激光脉冲
瑞利范围
线性偏振
脉冲持续时间
谐波场
高次谐波
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/31/6/064204

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Summary:The interference of high-order harmonics generated by two successive gas jets within a single laser pulse is discussed by a modeling with the inclusion of macroscopic propagation of the fundamental and harmonic fields in an ionizing medium. Based on the interference, we show that one can extract the laser Rayleigh range from the interference of harmonics and the accuracy of retrieve is independent of carrier-envelope phase while dependent on the pulse duration. Moreover~ we demonstrate that it is possible to optimize the single or range of harmonics with a high ratio relative to the adjacent orders by changing the separation of two gas jets, which is unavailable by using a single gas jet and linear polarized laser pulse.
Bibliography:11-1959/O4
The interference of high-order harmonics generated by two successive gas jets within a single laser pulse is discussed by a modeling with the inclusion of macroscopic propagation of the fundamental and harmonic fields in an ionizing medium. Based on the interference, we show that one can extract the laser Rayleigh range from the interference of harmonics and the accuracy of retrieve is independent of carrier-envelope phase while dependent on the pulse duration. Moreover~ we demonstrate that it is possible to optimize the single or range of harmonics with a high ratio relative to the adjacent orders by changing the separation of two gas jets, which is unavailable by using a single gas jet and linear polarized laser pulse.
LI Xiao-Yong, WANG Guo-Li, ZHOU Xiao-Xin（ College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 2 ExperimentM Center, Northwest University for Nationalities, Lanzhou 730030）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/6/064204