Controlling continuum harmonic generation with attosecond pulses

被引：11

作者：

Bandrauk, AD ^{[1
]}

Chelkowski, S ^{[1
]}

Nguyen, HS ^{[1
]}

机构：

[1] Univ Sherbrooke, Fac Sci, Chim Theor Lab, Sherbrooke, PQ J1K 2R1, Canada

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2003年 / 77卷 / 2-3期

关键词：

Laser Pulse; Molecular System; Harmonic Generation; Intense Laser; Ionization Model;

D O I：

10.1007/s00340-003-1194-7

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Photo-ionization and high-order harmonic generation (HOHG) in molecular systems under the combined action of infrared femtosecond (fs) and UV attosecond (as) intense laser pulses are investigated numerically for a one-dimensional non-Born-Oppenheimer H-2(+) ion. It is shown that such a coherent control scheme of fs-as ionization leads to significant enhancement of HOHG, with efficiencies exceeding the one obtained from a single fs pulse by several orders of magnitude. The basic mechanism for this enhancement is established as enhanced ionization and control of the recollision of a high-energy non-zero-velocity ionized electron, as compared to tunneling ionization models where the ionized electron has initial zero velocity. The combined superposition of fs-as pulses results in broad HOHG spectra with a large continuum near the cutoff, thus providing a new source for synthesizing new X-ray (vacuum ultraviolet) as pulses.

引用

页码：337 / 342

页数：6

共 19 条

[1]

Bandrauk A, 1994, MOL INTENSE LASER FI

[2] Enhanced ionization of the molecular ion H2+ in intense laser and static magnetic fields -: art. no. 053406 [J].

Bandrauk, AD ;

Lu, HZ .

PHYSICAL REVIEW A, 2000, 62 (05) :053406-053401

[3] Attosecond control of ionization and high-order harmonic generation in molecules [J].

Bandrauk, AD ;

Shon, NH .

PHYSICAL REVIEW A, 2002, 66 (03) :4

[4] Measuring the electric field of few-cycle laser pulses by attosecond cross correlation [J].

Bandrauk, AD ;

Chelkowski, S ;

Shon, NH .

PHYSICAL REVIEW LETTERS, 2002, 89 (28)

[5] High-order harmonic generation by one- and two-electron molecular ions with intense laser pulses [J].

Bandrauk, AD ;

Yu, HT .

PHYSICAL REVIEW A, 1999, 59 (01) :539-548

[6]

BANDRAUK AD, 2003, ADV MULTIPHOTON SPEC

[7]

BANDRAUK AD, 1997, PHYS REV A, V56, pR2357

[8] Intense few-cycle laser fields: Frontiers of nonlinear optics [J].

Brabec, T ;

Krausz, F .

REVIEWS OF MODERN PHYSICS, 2000, 72 (02) :545-591

[9] Electron-nuclear dynamics of multiphoton H2+ dissociative ionization in intense laser fields [J].

Chelkowski, S ;

Foisy, C ;

Bandrauk, AD .

PHYSICAL REVIEW A, 1998, 57 (02) :1176-1185

[10]

CHELKOWSKI S, 2003, IN PRESS PHYS REV LE

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