P. Panagiotopoulos

Arizona Center for Mathematical Sciences, University of Arizona, Tucson 85721-0094

Mid-IR filaments and carrier wave shock formation

Abstract

 

Carrier wave resolved numerical simulations of mid-IR (2μm – 4μm – 8μm) femtosecond laser pulses reveal the formation of carrier wave shocks for the first time in media with realistic dispersive properties, such as air, noble gases[1] and single-crystal diamond[2]. The exploration of the mid-IR filamentation regime reveals new nonlinear dynamics related to the carrier wave shock formation and onset of the spatiotemporal collapse. We take into account all relevant linear and nonlinear effects using the UPPE[3] and MKP[4] models, and perform a full numerical study on how carrier wave shock formation depends on wavelength, pulse duration, focusing geometry and medium of choice. Finally, we show that at the extreme limit the steepening can be strong enough to reshape the electric field into a "top-hat" which survives over multiple dispersive lengths, opening up the way to electric field shaping applications in the ultrafast regime.

1. P. Whalen, P. Panagiotopoulos, M. Kolesik, and J. V. Moloney, "Extreme carrier shocking of intense long-wavelength pulses," Phys. Rev. A

2. P. W. Paris Panagiotopoulos, Miroslav Kolesik, and Jerome V. Moloney, "Carrier field shock formation of long wavlength femtosecond pulses in dispersive media," Phys. Rev. A

3. M. Kolesik, and J. V. Moloney, "Nonlinear optical pulse propagation simulation: From Maxwell's to unidirectional equations," Phys. Rev. E

4. S. A. Kozlov, and S. V. Sazonov, "Nonlinear propagation of optical pulses of a few oscillations duration in dielectric media," J. Exp. Theor. Phys.

89, 023850 (2014). In Review (2014). 70, 036604 (2004). 84, 221-228 (1997).

 

References



Date: 16/12/2014
Time:15:00 (coffee & cookies will be served at 14:45)
Place:FORTH Seminar Room 1