Reshaping of femtosecond pulses by the Gouy phase shift

被引：18

作者：

Horváth, ZL ^{[1
]}

Bor, Z ^{[1
]}

机构：

[1] JATE Univ, Dept Opt & Quantum Elect, H-6701 Szeged, Hungary

来源：

PHYSICAL REVIEW E | 1999年 / 60卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.60.2337

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

It is shown that;because of the phase anomaly a femtosecond pulse propagates on the optical axis with a velocity greater than c in the vicinity of the focus not only for large but also small values of the Fresnel number. The group velocity is calculated and its physical meaning discussed. Analytical expressions are derived for the electric field. The causality of the system is proved. The mechanism of the superluminality is a reshaping process caused by the interference. Contrary to other superluminal phenomena, the superluminal propagation occurs in a classically not forbidden region. [S1063-651X(99)11108-5].

引用

页码：2337 / 2346

页数：10

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