Single-shot characterization of ultrashort light pulses

Abstract

In the subpicosecond time domain, the characterization and the control of ultrashort light pulses produced by means of femtosecond lasers are important problems. The low repetition rate of laser sources makes classical characterization methods, such as multishot autocorrelators, difficult to use. New different single-shot measurements of the temporal profile and of phase shifts introduced by nonlinear optical phenomena on femtosecond pulses are reported. These techniques are based on spatio-temporal and spectro-temporal transformations.

Signatures of the Self-Similar Regime of Strongly Coupled Stimulated Brillouin Scattering for Efficient Short Laser Pulse Amplification

“…However, this does not demonstrate that the seed is in fact amplified, as, for this to be true, the pump energy must be transferred within the seed temporal envelope. By Gaussian fitting (Ae −ðt=τ a Þ 2 ) the autocorrelation trace [28], one can retrieve the pulse duration τ ¼ τ a =2…”

Theory of noncollinear frequency doubling of transform limited pulses in non-steady-state regime

“…These curves are identical except for the scaling factor which is determined by the relation between the terms in the denominator of Eq. (9). If a = u 1 τ 0 , there is no the SH beam ellipticity and the parameter p = 1.…”

“…This enables tunable spontaneous down conversion and optical parametrical amplification [4]. The non-collinear interaction is preferable for autoand crosscorrelation measurements of femtosecond pulses because of the background free auto-and crosscorrelation traces [5][6][7][8][9][10]. Recently disordered nonlinear media were successfully used for these purposes [11][12][13][14].…”

Broadband Instability of Electromagnetic Waves in Nonlinear Media

“…In this experiment, using a scanning intensity autocorrelator, we actually determined the averaged parameters of an ultrashort wave packet, as the analyzed signal had the shape of a femtosecond pulse train with a repetition rate of about 100 MHz. In principle, a similar interference autocorrelator can also be realized for rarely repeated or even single optical pulses if, as was proposed in (Brun, Georges & LeSaux, 1991), the standard scheme of a single-pulse correlator (Brun, Georges & LeSaux, 1991) including a nonlinear crystal with tangential (superwide angular) synchronism is used.…”