Self-phase modulation in a thin fused silica plate upon interaction with a converging beam of down-chirped femtosecond radiation

Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses

“…1b). The origins of periodic low-frequency spectral modulation under SPM conditions were discussed in [16,17], and other effects can be considered [5]. Subsequently, at the ultrashort laser pulse duration τ=2.4 ps, the broadening further decreases (511-517 nm), but becomes more pronounced on the red wing (Fig.…”

Effect of Group Delay Dispersion on Femtosecond Pulse Self-shortening in Kerr Media: Investigation of Femtosecond Pulse Self-shortening Phenomenon Based on the Transient Regime of Multiple Filamentation in Kerr Media with Different Group Delay Dispersion

“…However, it is difficult to obtain pulses shorter than 20-30 fs in multi-terawatt and petawatt power level solid state systems because of spectrum narrowing during [6,7]. Earlier, we presented the results of investigations of a new mechanism for femtosecond pulse self-shortening in thin optically transparent materials with Kerr nonlinearity [8][9][10][11]. In [11], this mechanism was attributed to the formation of multiple filaments in the trailing edge of the pulse, which leads to a sharp increase in diffraction and refraction losses in the near-axis region.…”

Evidence for nonisochronism of material vibrations in stimulated Raman scattering

“…However nonisochronism of VM in this phenomenon has not been observed or discussed. It is shown in this work that the spectral characteristics of high power femtosecond light pulses, which are transmitted through a mm-long fused silica (FS) plate [4,5] and through a 2.5 cm-long BK-7-glass plate [6], are evidence of SRS with nonisochronous material vibrations.…”

“…In [4,5] a negatively chirped pulse of visible radiation of wavelength λ ≈ 475 nm with 160/130 fs duration and 5/3 nm (~220/135 cm −1 ) spectral bandwidth (all FWHM) was sent to 2.3/1 mm-thick FS plate. In [6] a negatively chirped pulse of 75 fs duration and of 21 nm (~330 cm −1 ) spectral bandwidth of near-IR (λ ≈ 800 nm) radiation was sent to 2.54 cm-thick BK-7-glass plate.…”

“…In [6] a negatively chirped pulse of 75 fs duration and of 21 nm (~330 cm −1 ) spectral bandwidth of near-IR (λ ≈ 800 nm) radiation was sent to 2.54 cm-thick BK-7-glass plate. The intensity of incident radiation, I i , was varied in [4,5] by moving of the sample along the axis of focused laser beam and in [6] with help of an attenuator consisting of a half-wave plate and a polarizer.…”