Enhancement of harmonic generation by Fresnel-lensing effects

Enhancement Factors Obtained Using the Iris ^a

^a  Theory: maximum values of curves of Fig. 1 ( $k=2$ , dotted curve; $k=3$ , continuous curve). Experiment, SH and TH energy yield measured in the generation experiments. All results are normalized to the results for free propagation (no iris).

Enhancement Factors Obtained Using the FZP ^a

^a  Equation (1), calculated assuming a Gaussian pump intensity profile $z=0$ (theory) and using the actual intensity profile measured at $z=f$ (actual). The results for the SH and TH energy yields as measured in the generation experiment are also shown (experiment). All results are normalized to the results for free propagation (no FZP).

Table 1

Enhancement Factors Obtained Using the Iris ^a

^a  Theory: maximum values of curves of Fig. 1 ( $k=2$ , dotted curve; $k=3$ , continuous curve). Experiment, SH and TH energy yield measured in the generation experiments. All results are normalized to the results for free propagation (no iris).

Table 2

Enhancement Factors Obtained Using the FZP ^a

^a  Equation (1), calculated assuming a Gaussian pump intensity profile $z=0$ (theory) and using the actual intensity profile measured at $z=f$ (actual). The results for the SH and TH energy yields as measured in the generation experiment are also shown (experiment). All results are normalized to the results for free propagation (no FZP).