Chirped pulse coherent amplification with full extraction of active medium energy

Two-photon Raman-type self-induced transparency for few-cycle laser pulses

“…(4) [16]. For the numerical simulations we used an improved version of the code presented in [19][20][21].…”

“…These properties are an instantaneous intensity-dependent cross section, continuous frequency-modulating and pulse reshaping. It has been shown that the 2π pulse RSIT in conditions of stimulated Raman self-scattering (SRSS)permit to generate a spectral supercontinuum [17][18][19][20]. First a breakup of a few-cycle 4π pulse into two 2π pulse was observed in our simulation on SRSS [21] with pulses containing three and four optical cycles (full width at half maximum (FWHM)).…”

“…For example, for a typical value of d 21 , 10 −18 cgs units, this is a good approximation (to within 1%) at N = 10 18 cm −3 . In our work [16] a two-photon Raman-type SIT (RSIT) for few-cycle laser pulses had been predicted and an equation for the change in the total energy had been derived [16]. However, the transient pulse behavior was not studied.…”

Generation and control of femtosecond pulses by molecular modulation

“…In separate work it was demonstrated that molecular wavepacket revivals can produce frequency chirp, which in turn would allow femtosecond pulse compression by normal dispersion in a thin output window [5]. There has also been significant early work on dynamics of an intense femtosecond laser pulse in a Raman-active medium, including predictions of 2 pulse formation and attosecond pulse generation [6]. In 1993, Losev and Lutsenko [7] suggested and demonstrated on-resonance two colour pumping, and Yoshikawa and Imasaka [8] suggested the application of multi-component Raman spectra to femtosecond time scale pulses.…”

“…Of particular pertinence to the subject of this paper is the work of Korn and colleagues, who have impulsively excited a vibrational mode of SF 6 and used the resulting time-varying refractive index to produce a sequence of compressed femtosecond pulses [4]. In separate work it was demonstrated that molecular wavepacket revivals can produce frequency chirp, which in turn would allow femtosecond pulse compression by normal dispersion in a thin output window [5].…”