Optical ionization evolution effect on photocurrent produced from two-color femtosecond laser pulses

doi:10.1007/s12200-014-0450-2

Front. Optoelectron.

2015, Vol. 8

Issue (1) : 93-97 https://doi.org/10.1007/s12200-014-0450-2

RESEARCH ARTICLE

Optical ionization evolution effect on photocurrent produced from two-color femtosecond laser pulses

Haiwei DU^1,^*(

),Nan YANG²

1. Terahertz Sensing and Imaging Team, Center for Advanced Photonics, RIKEN, Sendai 9800845, Japan
2. Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

When laser intensity varies, the ionization induced by optical field can be described by multiphoton ionization (MPI) in low regime and tunneling ionization (TI) in high regime. An empirical formula was used to fit the ionization happened between these two limitation ionization processes. Based on this, ionization rate and photocurrent induced by two-color femtosecond laser pulses interaction with air-plasma were investigated numerically. It was found that they have different relations with the laser intensity.

Keywords multiphoton ionization (MPI) tunneling ionization (TI) photocurrent

Corresponding Author(s): Haiwei DU

Just Accepted Date: 09 October 2014 Online First Date: 14 November 2014 Issue Date: 13 February 2015

Cite this article:

Haiwei DU,Nan YANG. Optical ionization evolution effect on photocurrent produced from two-color femtosecond laser pulses[J]. Front. Optoelectron., 2015, 8(1): 93-97.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-014-0450-2
https://academic.hep.com.cn/foe/EN/Y2015/V8/I1/93

Fig.1 Relationship between Keldysh parameter γ_k (a), ionization rate w (b) and laser intensity

Fig.2 Relationship between photocurrent and laser intensity

Fig.3 Relationship between laser intensity, second harmonic (SH) phase and photocurrent

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