High average power second harmonic generation in air

被引：44

作者：

Beresna, Martynas ^{[1
]}

Kazansky, Peter G. ^{[1
]}

Svirko, Yuri ^{[2
]}

Barkauskas, Martynas ^{[3
]}

Danielius, Romas ^{[3
]}

机构：

[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

[2] Univ Joensuu, Dept Math & Phys, FI-80101 Joensuu, Finland

[3] Light Convers Ltd, LT-10223 Vilnius, Lithuania

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 12期

基金：

英国工程与自然科学研究理事会; 芬兰科学院;

关键词：

DISCHARGES; LIGHT; BEAMS;

D O I：

10.1063/1.3232235

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate second harmonic vortex generation in atmospheric pressure air using tightly focused femtosecond laser beam. The circularly polarized ring-shaped beam of the second harmonic is generated in the air by fundamental beam of the same circular polarization, while the linear polarized beam produces two-lobe beam at the second harmonic frequency. The achieved normalized conversion efficiency and average second harmonic power are two orders of magnitude higher compared to those previously reported and can be increased up to 20 times by external gas flow. We demonstrate that the frequency doubling originates from the gradient of photoexcited free electrons created by pondermotive force. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3232235]

引用

页数：3

共 14 条

[1] Triggering and guiding of megavolt discharges by laser-induced filaments under rain conditions [J].

Ackermann, R ;

Stelmaszczyk, K ;

Rohwetter, P ;

Méjean, G ;

Salmon, E ;

Yu, J ;

Kasparian, J ;

Méchain, G ;

Bergmann, V ;

Schaper, S ;

Weise, B ;

Kumm, T ;

Rethmeier, K ;

Kalkner, W ;

Wöste, L ;

Wolf, JP .

APPLIED PHYSICS LETTERS, 2004, 85 (23) :5781-5783

[2] Generation of optical vortex beams by nonlinear wave mixing [J].

Bahabad, Alon ;

Arie, Ady .

OPTICS EXPRESS, 2007, 15 (26) :17619-17624

[3] OPTICAL 2ND-HARMONIC GENERATION IN ATOMIC VAPORS WITH FOCUSED BEAMS [J].

BETHUNE, DS .

PHYSICAL REVIEW A, 1981, 23 (06) :3139-3151

[4] Single-mode photonic band gap guidance of light in air [J].

Cregan, RF ;

Mangan, BJ ;

Knight, JC ;

Birks, TA ;

Russell, PS ;

Roberts, PJ ;

Allan, DC .

SCIENCE, 1999, 285 (5433) :1537-1539

[5] Conical forward THz emission from femtosecond-laser-beam filamentation in air [J].

D'Amico, C. ;

Houard, A. ;

Franco, M. ;

Prade, B. ;

Mysyrowicz, A. ;

Couairon, A. ;

Tikhonchuk, V. T. .

PHYSICAL REVIEW LETTERS, 2007, 98 (23)

[6] Second-harmonic generation and the orbital angular momentum of light [J].

Dholakia, K ;

Simpson, NB ;

Padgett, MJ ;

Allen, L .

PHYSICAL REVIEW A, 1996, 54 (05) :R3742-R3745

[7] Electrically stimulated light-induced second-harmonic generation in glass: Evidence of coherent photoconductivity [J].

Kazansky, PG ;

Pruneri, V .

PHYSICAL REVIEW LETTERS, 1997, 78 (15) :2956-2959

[8] Nonlinear Thomson scattering: A tutorial [J].

Lau, YY ;

He, F ;

Umstadter, DP ;

Kowalczyk, R .

PHYSICS OF PLASMAS, 2003, 10 (05) :2155-2162

[9] IMAGING THE NONLINEAR GRATING IN FREQUENCY-DOUBLING FIBERS [J].

MARGULIS, W ;

LAURELL, F ;

LESCHE, B .

NATURE, 1995, 378 (6558) :699-701

[10] Image of second harmonic emission generated from ponderomotively excited plasma density gradient [J].

Mori, M ;

Takahashi, E ;

Kondo, K .

PHYSICS OF PLASMAS, 2002, 9 (06) :2812-2815

← 1 2 →