Pulse-shape determination of intracavity compressed picosecond pulses by two-photon fluorescence analysis

Abstract

Intracavity pulse compression of self-phase modulated pulses in passively modelocked lasers leads to temporally structured pulses. Experimental two-photon fluorescence traces are decorrelated to determine the approximate temporal shape of the modulated pulses.

Generation of time synchronized frequency tunable picosecond light pulses in a mode-locked Nd:glass double laser system

“…The half-width Ar (fwhm) of a fluorescence trace S(z) (measured at the signal height [S(ao) + S(0)]/2) is related to the auto-correlation time AT by AT=2nAz/c 0 and the relation between pulse duration A/ L and the autocorrelation time AT is A/ L =Ar/j\ n is the refractive index of the two-photon absorbing dye solution at the laser frequency and c 0 is the vacuum light velocity, y depends on the temporal pulse shape. For gaussian pulse shapes it is )-=2 ,/: [56,57]. …”

Efficient phase-matched third harmonic light generation in hexafluoroisopropanol solutions of a pyrimidonecarbocyanine dye

“…", of the third-order susceptibility Xo!xxxx(-<^\ <ox, ~ah, u)x) by [21] (X) (Oj ^ 2TTV, is the angular frequency of the fundamental laser. The imaginary part of the two-photon absorption hyperpolarizability is related to the two-photon absorption cross-section by The responsible pump pulse intensity is approximated by the output pulse intensity since the short interaction length, //,TnG, CI.THG -SaJ') limits the main third harmonic contribution to the exit region of the cell.…”

Single-frame measurement of complex laser pulses tens of picoseconds long using pulse-front tilt in cross-correlation frequency-resolved optical gating

“…The main approach for measuring many-ps-long pulses has long been multishot intensity autocorrelation using a delay-scanning stage and such optical nonlinearities as second-harmonic generation (SHG) [45][46][47], two-photon photoconductivity [48,49], two-photon fluorescence [50,51], and high-order effects [52,53]. Multishot interferometric autocorrelation [54,55], also using a scanning delay stage, has also been used.…”