In this Letter we provide what is believed to be the first experimental evidence of suppression of the number of filaments for high-intensity laser pulses propagating in air by beam astigmatism. We also show that the number, pattern, and spatial stability of the filaments can be controlled by varying the angle that a focusing lens makes with the axial direction of propagation. This new methodology can be useful for applications involving atmospheric propagation, such as remote sensing.
© 2004 Optical Society of America
Gadi Fibich, Shmuel Eisenmann, Boaz Ilan, and Arie Zigler, "Control of multiple filamentation in air," Opt. Lett. 29, 1772-1774 (2004)