Phase shifts in terahertz wave generation by tightly focused bichromatic laser pulses

被引：6
|
作者：
Pyragaite, V. [1 ]
Smilgevicius, V. [1 ]
Steponkevicius, K. [1 ]
Makauskas, B. [1 ]
Vaicaitis, V. [1 ]
机构：
[1] Vilnius State Univ, Laser Res Ctr, LT-10223 Vilnius, Lithuania
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2014年 / 31卷 / 07期
关键词：
AIR; RADIATION; EMISSION;
D O I：
10.1364/JOSAB.31.001430
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Terahertz wave generation from air excited by tightly focused fundamental and second-harmonic pulses of a femtosecond Ti:sapphire laser is analyzed both theoretically and experimentally for various pump pulse energies. Numerical calculations, based on the microscopic polarization model, revealed that the experimentally obtained dependencies of terahertz yield can be well explained taking into account phase shifts of bichromatic pump waves, acquired during free propagation in air, and nonlinear second-harmonic crystal, as well as by considering the Gouy phases of focused laser beams. (C) 2014 Optical Society of America
引用
收藏
页码：1430 / 1435
页数：6
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