Attosecond probing of instantaneous ac Stark shifts in helium atoms

被引：18

作者：

He, Feng ^{[1
,2
]}

Ruiz, Camilo ^{[3
]}

Becker, Andreas ^{[4
,5
]}

Thumm, Uwe ^{[6
]}

机构：

[1] SJTU, Minist Educ, Key Lab Laser Plasmas, Shanghai 200240, Peoples R China

[2] SJTU, Dept Phys, Shanghai 200240, Peoples R China

[3] Ctr Laseres Pulsados CLPU, E-37008 Salamanca, Spain

[4] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[5] Univ Colorado, JILA, Boulder, CO 80309 USA

[6] Kansas State Univ, James R Macdonald Lab, Manhattan, KS 66506 USA

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2011年 / 44卷 / 21期

基金：

美国国家科学基金会;

关键词：

REAL-TIME OBSERVATION; PULSES; LASER; IONIZATION; HYDROGEN; FIELD; SPECTROSCOPY; COMPRESSION; GENERATION; EVOLUTION;

D O I：

10.1088/0953-4075/44/21/211001

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Based on the numerical solutions of the time-dependent Schrodinger equation within the single-active-electron approximation, we propose a method for observing instantaneous atomic level shifts in an oscillating strong infrared (IR) field with sub-IR-cycle time resolution, by using a single tunable attosecond (SA) pulse to probe excited states of the perturbed atom. The ionization probability in the combined fields depends on both the frequency of the attosecond pulse and the time delay between both pulses, since the IR field periodically shifts SA-pulse-excited energy levels into and out of resonance.

引用

页数：5