CEP-stable tunable THz-emission originating from laser-waveform-controlled sub-cycle plasma-electron bursts

被引：45

作者：

Balciunas, T. ^{[1
]}

Lorenc, D. ^{[1
]}

Ivanov, M. ^{[2
]}

Smirnova, O. ^{[2
]}

Zheltikov, A. M. ^{[3
]}

Dietze, D. ^{[1
]}

Unterrainer, K. ^{[1
]}

Rathje, T. ^{[4
]}

Paulus, G. G. ^{[4
]}

Baltuska, A. ^{[1
]}

Haessler, S. ^{[1
,5
]}

机构：

[1] Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

[2] Max Born Inst, D-12489 Berlin, Germany

[3] Moscow MV Lomonosov State Univ, Ctr Int Laser, Dept Phys, Moscow 119992, Russia

[4] Univ Jena, Inst Opt & Quantum Elect, D-07743 Jena, Germany

[5] Univ Paris Saclay, CNRS, Ecole Polytech, Lab Opt Appl,ENSTA Paristech, F-91762 Palaiseau, France

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 12期

基金：

奥地利科学基金会;

关键词：

CARRIER-ENVELOPE PHASE; HARMONIC-GENERATION; TERAHERTZ-EMISSION; PULSES; GAS; LIGHT; AIR;

D O I：

10.1364/OE.23.015278

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study THz-emission from a plasma driven by an incommensurate-frequency two-colour laser field. A semi-classical transient electron current model is derived from a fully quantum-mechanical description of the emission process in terms of sub-cycle field-ionization followed by continuum-continuum electron transitions. For the experiment, a CEP-locked laser and a near-degenerate optical parametric amplifier are used to produce two-colour pulses that consist of the fundamental and its near-half frequency. By choosing two incommensurate frequencies, the frequency of the CEP-stable THz-emission can be continuously tuned into the mid-IR range. This measured frequency dependence of the THz-emission is found to be consistent with the semi-classical transient electron current model, similar to the Brunel mechanism of harmonic generation. (C) 2015 Optical Society of America

引用

页码：15278 / 15289

页数：12