Abstract-Effect of an external electric field on the coherent terahertz emission from multiple filaments in air

• Sergey I. Mitryukovskiy, 
• Yi Liu, 
• Bernard Prade, 
• Aurélien Houard, 
• André Mysyrowicz

http://link.springer.com/article/10.1007/s00340-014-5830-1

We describe the terahertz emission from multiple filaments in air in the presence of an external electric field. A strong enhancement of the radiated terahertz energy is obtained by the combined effect of terahertz field interference and presence of a static electric field. 

Abstract-Coherent synthesis of terahertz radiation from femtosecond laser filaments in air

Sergey I. Mitryukovskiy, Yi Liu, Bernard Prade, Aurélien Houard, and André Mysyrowicz

Laboratoire d'Optique Appliquée, ENSTA ParisTech/CNRS/Ecole Polytechnique, 828, Boulevard des Maréchaux, Palaiseau, F-91762, France 

http://apl.aip.org/resource/1/applab/v102/i22/p221107_s1?isAuthorized=no

We report on the coherent synthesis of pulsed terahertz radiation from femtosecond laser filaments organized in an array. The terahertz intensity is proportional to the square of the number of the filaments, which provides a simple method for scaling up of the terahertz energy with a powerful femtosecond laser. Moreover, directional off-axis terahertz radiation can be achieved. This paves the way for applications of this terahertz source for remote sensing.

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