Enhanced harmonic generation efficiency using focussing devices based on Fresnel diffraction |
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Authors: | S. Cavalieri L. Fini E. Sali R. Buffa |
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Affiliation: | (1) Dipartimento di Fisica and LENS, Università di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy;(2) Dipartimento di Fisica, Università di Siena, Via Roma 56, I-53100 Siena, Italy |
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Abstract: | We propose the use of focusing devices based on Fresnel diffraction (such as a Fresnel zoneplate) as a means to enhance the efficiency of nonlinear-optical processes starting from radiation in the ultraviolet region, where ordinary lenses cannot be used. We present experimental results of a proof-of-concept experiment involving the efficient generation of second-and third-harmonic laser radiation in the visible range. An enhancement of a factor 6 in the third-harmonic yield is obtained by simply limiting the laser beam with a circular aperture. Higher enhancement factors (up to 16) are obtained using a Fresnel zoneplate. The experimental findings are in good agreement with the results of a simple theoretical analysis. |
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