Supercontinuum generation by femtosecond flat-top laser pulses in fused silica

Spectral Hump Formation in Visible Region of Supercontinuum from Shaped Femtosecond Laser Filamentation in Fused Silica

“…Our previous studies revealed that the pulse shape plays a dominant role in the filamentation and SC generation due to the SPM and electron generation [38,39]. More complicated pulse shapes will induce steeper ascending and descending edges in the laser pulse, which can lead stronger blueside spectral extension [39]. In our experiment, the pulse is modulated to an extremely complicated pulse with many temporal peaks, as shown in Figure 6.…”

“…The self-phase modulation (SPM) is regarded as the main mechanism causing the spectral broadening of the intense femtosecond laser pulse. Our previous studies revealed that the pulse shape plays a dominant role in the filamentation and SC generation due to the SPM and electron generation [38,39]. More complicated pulse shapes will induce steeper ascending and descending edges in the laser pulse, which can lead stronger blueside spectral extension [39].…”

Numerical simulation study on distinguishing nonlinear propagation regimes of femtosecond pulses in fused silica

“…To simulate the propagation of the femtosecond laser pulse in the fused silica, we solve the nonlinear Schrödinger Equation (NLSE), coupled with electron generation 22 , which can be expressed as follows: where is the electric field envelope, z is the propagation distance, is the central wavenumber of the laser pulse with a central wavelength =800 nm. describes the transverse diffraction, and the corresponding operator describes spatio-temporal focusing effect.…”

High power supercontinuum generation by dual-color femtosecond laser pulses in fused silica

“…A laser beam that propagates through a nonlinear medium can form a unique structure which is termed as filamentation, accompanying a spectral broadening whose range spans from infrared to ultraviolet (UV), a phenomenon known as the supercontinuum (SC) generation. [1] Nonlinear processes that participate simultaneously in filamentation and SC generation are considered as self-phase modulation, [2] selfsteepening, [3,4] and plasma formation. [5] The broadband spectral characteristics of the SC stimulate many potentials in various research fields and applications, such as gas sensing, [6,7] electronic spectroscopy, [8] cavity ring-down spectroscopy, [9] and few-cycle femtosecond pulses generation.…”