Terahertz radiation pattern of argon cluster irradiated with intense femtosecond laser pulses

Author

Nagashima, Takeshi ; Shibuya, Kyoji ; Hangyo, Masanori ; Hashida, Masaki ; Sakab, Shuji

Author_Institution

Inst. of Laser Eng., Osaka Univ., Suita

fYear

2007

fDate

2-9 Sept. 2007

Firstpage

730

Lastpage

731

Abstract

We have investigated the angular distribution of the terahertz radiation from the argon cluster targets irradiated with the intense femtosecond laser pulses in order to study the radiation mechanism from laser produced plasmas. The relatively strong radiation was observed in the directions at 45 and 135 degrees. In those directions, the horizontally polarized radiation was much stronger than the vertical component. In order to interpret the experimental results of the angular distribution and laser polarization dependence of the radiated THz wave qualitatively, a mechanism based on the radiation from time-varying quadrupoles produced by the ponderomotive force is proposed.

Keywords

argon; high-speed optical techniques; radiation detection; submillimetre wave generation; angular distribution; argon cluster; intense femtosecond laser pulses; laser polarization dependence; laser produced plasmas; laser radiation mechanism; ponderomotive force; terahertz radiation pattern; time-varying quadrupoles; Argon; Atomic beams; Atomic measurements; Chemical lasers; Frequency; Optical pulses; Plasma measurements; Plasma waves; Polarization; Pulse amplifiers; Electromagnetic radiation; Nonlinear optics; Plasmas; Pulsed lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on

Conference_Location

Cardiff

Print_ISBN

978-1-4244-1438-3

Type

conf

DOI

10.1109/ICIMW.2007.4516703

Filename

4516703