Frequency-doubling characteristics of high-power, ultrafast vortex beams

Show simple item record Apurv Chaitanya, N. Aadhi, A. Jabir, M. V. Samanta, Goutam Kumar 2015-06-26T06:02:18Z 2015-06-26T06:02:18Z 2015-06
dc.identifier.citation Apurv Chaitanya, N.; Aadhi, A; Jabir, M. V. and Samanta, Goutam K., “Frequency-doubling characteristics of high-power, ultrafast vortex beams”, Optics Letters, DOI: 10.1364/OL.40.002614, vol. 40, no. 11, pp. 2614-2617, Jun. 2015. en_US
dc.identifier.issn 0146-9592
dc.description.abstract We report on frequency-doubling characteristics of high-power, ultrafast optical vortex beams in a nonlinear medium. Based on single-pass second-harmonic generation (SHG) of optical vortices in 1.2 mm long bismuth triborate (BIBO) crystal, we studied the effect of different parameters influencing the SHG process in generating high-power and higher-order vortices. We observed a decrease in SHG efficiency with the order, which can be attributed to the increase of the vortex beam area with order. Like a Gaussian beam, optical vortices show focusing-dependent conversion efficiency. However, under similar experimental conditions, the optimum focusing condition for optical vortices is reached at tighter focusing with orders. We observed higher angular acceptance bandwidth in the case of optical vortices than that of a Gaussian beam; however, there is no substantial change in angular acceptance bandwidth with vortex order. We also observed that in the frequency-doubling process, the topological charge has negligible or no effect in temporal and spectral properties of the beams. We have generated ultrafast vortices at 532 nm with power as much as 900 mW and order as high as 12. In addition, we have devised a novel scheme based on linear optical elements to double the order of any optical vortex at the same wavelength. en_US
dc.description.statementofresponsibility N. Apurv Chaitanya et al.
dc.format.extent Vol. 40, No. 11, pp. 2614-2617
dc.language.iso en_US en_US
dc.publisher OSA Publishing en_US
dc.subject High-power en_US
dc.subject Optical vortices en_US
dc.subject Phase dislocations en_US
dc.subject Second-harmonic generation en_US
dc.subject Vortex beams en_US
dc.title Frequency-doubling characteristics of high-power, ultrafast vortex beams en_US
dc.type Article en_US
dc.relation.journal Optics Letters

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