Laser pulse propagation

The formation of self-guided filaments in the air at the laboratory scale has been known for almost ten years [12, 15-17]. Filamentation occurs when high-power laser pulses propagate in a highly non-linear way in transparent media (Fig. 14.2). This high non-linearity induces a self-action, which... 

J. Kasparian, R. Sauerbrey, D. Mondelain, S. Niedermeier, J. Yu, J.-P. Wolf, Y.-B. Andre, M. Franco, B. Prade, A. Mysyrowicz, S. Tzortzakis, M. Rodriguez, H. Wille, L. Woste, Infrared extension of the supercontinuum generated by fs-TW-laser pulses propagating in the atmosphere, Optics Letters 25, 1397-1399 (2000)... 

Finally, we also mention a substantially more complex problem — that of laser pulse propagation through an absorbing medium. 

Barth et al. performed a quantum simulation of laser-driven electron dynamics in Mg porphyrin, which is an aromatic molecule of symmetry [14]. The results of their simulation showed that n electrons of Mg porphyrin can be rotated around its aromatic ring by an ultrashort circularly polarized UV laser pulse propagating along its C4 axis. The rotation direction of n electrons is predetermined in a laboratory frame by that of the polarization plane of the circularly polarized laser pulse, that is, by photon angular momentum. 

FIG. 14. Normalized third-harmonic power vs relative lime delay of the tw o fundamental laser pulses propagating in opposite directions in the mixture of Fig. 12 at the phase-matching temperature 29.9 °C. The circles are experimental points with an uncertainty of 20-c. The solid curve is obtained from theoretical calculation by assuming that the mode-locked pulses are made of two half-Gaussian curves joined at their maxima, with the leading half 5.5 times broader than the lagging half. 

FIG. 3. An example of the observed phase shift as a function of time induced by pulsed laser heating in a SCB film. The data were obtained for a 27-mJ laser pulse propagating in a sample 190 um thick under the condition ISoiit. The solid curve is... 

If we consider a multimode nanosecond laser pulse propagating through a fiber core made of L34, at each position and time, the rate equations for the... 

CCD pixel size limitation and possible fluorescence saturation. A femtosecond time-resolved optical polarigraphy method for visualizing laser pulse propagation was recently demonstrated by Fujimoto et al. [160], from which, however, pure information on the focal spots is difficult to extract. 

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