Download Femtosecond Laser Pulses: Principles and Experiments by C. Hirlimann (auth.), Professor Dr. Claude Rullière (eds.) PDF

By C. Hirlimann (auth.), Professor Dr. Claude Rullière (eds.)

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20. Simple hyperbolic model of the absorption coefficient 0: of a twolevel system versus incident intensity. When the intensity reaches the saturation value Isat the low-intensity absorption ao is reduced by a factor of two 50 C. 58). Ii is the intensity incident on the absorbing medium of length L, and It is the transmitted intensity. 21 shows a numerical simulation of the transmission behavior as a function of the incoming light intensity. 2 Fig. 21. Numerical simulation of transmission versus incoming intensity in a two-level electronic system o~------------------------~ Saturable absorbers can be split into two classes depending on the speed of the change of transmission.

24) r(x) = ~ + 2ik"x. 24), it can be observed that the phase of the central frequency Wo is delayed by an amount x/v¢ after propagation over a distance x. Because the phase is not a measurable quantity, this effect has no 34 C. Hirlimann Fig. 8. Schematic relationship between the phase and group velocities in an ordinary transparent medium. Note that this relationship does not depend on the sign of the curvature of the dispersion curve w(k) k observable consequence. The phase velocity v¢(w) measures the propagation speed of the plane-wave components of the pulse in the medium.

Therefore, as they are not related to any specific electronic resonance, tunability can be achieved by adjusting the incidence angles of the beam, on the crystal. However, the tunability bandwidth is limited by the phase-matching condition. On any timescale down to a few femtoseconds these effects can be considered as instantaneous. < W2. The pump frequency is greater than the signal frequency. Again, there are two cases. WI • Case 1 corresponds again to up-conversion with a reversal of the roles played by the pump and the signal, compared to the previous Case 2.

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