Pulse-bandwidth dependence of coherent phase control of resonance-mediated (2+1) three-photon absorption

被引：19

作者：

Gandman, Andrey ^{[1
]}

Chuntonov, Lev ^{[1
]}

Rybak, Leonid ^{[1
]}

Amitay, Zohar ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Schulich Fac Chem, IL-32000 Haifa, Israel

来源：

PHYSICAL REVIEW A | 2007年 / 76卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.76.053419

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study in detail coherent phase control of femtosecond resonance-mediated(2+1) three-photon absorption and its dependence on the spectral bandwidth of the excitation pulse. The regime is the weak-field regime of third perturbative order. The corresponding interference mechanism involves a group of three-photon excitation pathways that are on resonance with the intermediate state and a group of three-photon excitation pathways that are near resonant with it. The model system of the study is atomic sodium (Na), for which experimental and numerical-theoretical results are obtained. Prominent among the results is our finding that with simple proper pulse shaping an increase in the excitation bandwidth leads to a corresponding increase in the enhancement of the three-photon absorption over the absorption induced by the (unshaped) transform-limited pulse. For example, here, a 40 nm bandwidth leads to an order-of-magnitude enhancement over the transform-limited absorption.

引用

页数：9

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