Spectral modulation and supercontinuum generation assisted by infrared femtosecond plasma grating

Abstract

Spectral modulation and supercontinuum generation of a probe pulse is investigated by using the plasma grating induced by the interference of two infrared femtosecond laser pulses. The dependences of the supercontinuum generation from the probe pulse on the time delay, the relative polarization angle between the probe pulse and the two-pump pulses, and the input probe pulse energy are investigated. The far-field spatial profiles of the three pulses are measured with different time delays and relative polarization angle, and the core energy of the probe pulse as functions of the time delay and relative polarization angle are also shown.

Defocusing role in femtosecond filamentation: Higher-order Kerr effect or plasma effect?

“…The propagation of ultrashort intense laser pulses in air has been a hot area of research due to its promising application prospects such as terahertz radiation, [1,2] generation of white-light supercontinuum, [3][4][5][6] rain-making, [7,8] and lightning protection, [9,10] etc. During the propagation of the femtosecond laser pulse in gaseous media, the self-focusing due to the second-order Kerr effect makes the laser intensity increase continuously and as the intensity increases to some value, the nonlinear defocusing effects will arrest its further increase.…”

Design of Typical Aerospace Materials Database System

“…In the rapid development of computer technology today and the growing popularity of various high-tech applications, the computer has become a tool for all industries. The computer technology and manufacturing techniques combine to become the inevitable trend of the development of machinery industry [6][7]. According to CIRP survey of cutting database economic showed that cutting database processing costs can drop by more than 10% [8].…”