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

Enhanced harmonic generation efficiency using focussing devices based on Fresnel diffraction / S. CAVALIERI; L. FINI; E. SALI; R. BUFFA. - In: LASER PHYSICS. - ISSN 1054-660X. - STAMPA. - 17:(2007), pp. 143-147. [10.1134/S1054660X07020168]

Enhanced harmonic generation efficiency using focussing devices based on Fresnel diffraction

CAVALIERI, STEFANO;FINI, LORENZO;SALI, EMILIANO;
2007

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
2007
17
143
147
S. CAVALIERI; L. FINI; E. SALI; R. BUFFA
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/252282
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