Enhancement of harmonic generation by Fresnel-lensing effects.
We present experimental results of enhanced second- and third-harmonic generation efficiency from Fresnel-lensing effects. We obtained enhancement by a factor of 6 in the third-harmonic yield by simply limiting the laser beam with an iris. Higher enhancement factors (up to 16) were obtained with a Fresnel zone plate. The experimental findings are in good agreement with the results of a simple theoretical analysis.
Cavalieri
Stefano
S
Dipartimento di Fisica and LENS, Universitá di Firenze, Via G. Sansone, Italy.
Fini
Lorenzo
L
Sali
Emiliano
E
Buffa
Roberto
R