Efficient nonlinear generation of high power, higher order, ultrafast "perfect" vortices in green

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dc.contributor.author Apurv Chaitanya, N.
dc.contributor.author Jabir, M. V.
dc.contributor.author Samanta, Goutam Kumar
dc.date.accessioned 2016-05-21T12:08:55Z
dc.date.available 2016-05-21T12:08:55Z
dc.date.issued 2016-04
dc.identifier.citation Apurv Chaitanya, N.; Jabir, M. V. and Samanta, G. K., "Efficient nonlinear generation of high power, higher order, ultrafast "perfect" vortices in green", Journal of Thermal Analysis and Calorimetry, DOI: 10.1364/OL.41.001348, vol. 41, no. 7, pp. 1348-1351, Apr 2016. en_US
dc.identifier.issn 1388-6150
dc.identifier.uri http://dx.doi.org/10.1364/OL.41.001348
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2265
dc.description.abstract We report on efficient nonlinear generation of ultrafast, higher order "perfect" vortices at the green wavelength. Based on Fourier transformation of the higher order Bessel-Gauss (BG) beam generated through the combination of the spiral phase plate and axicon, we have transformed the Gaussian beam of the ultrafast Yb-fiber laser at 1060 nm into perfect vortices of power 4.4 W and order up to 6. Using single-pass second-harmonic generation (SHG) of such vortices in 5 mm long chirped MgO-doped, periodically poled congruent LiNbO3 crystal, we have generated perfect vortices at green wavelength (530 nm) with output power of 1.2 W and vortex order up to 12 at a single-pass conversion efficiency of 27%, independent of the orders. This is the highest single-pass SHG efficiency of any optical beams other than Gaussian beams. Unlike the disintegration of higher order vortices due to spatial walk-off effect in birefringent crystals, here, the use of the quasi-phase-matching process enables generation of high-quality vortices, even at higher orders. The green perfect vortices of all orders have temporal and spectral widths of 507 fs and 1.9 nm, respectively, corresponding to a time-bandwidth product of 1.02. en_US
dc.description.statementofresponsibility by N. Apurv Chaitanya, M. V. Jabir and G. K. Samanta
dc.format.extent vol. 41, no. 7, pp. 1348-1351
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Harmonic generation and mixing en_US
dc.subject Upconversion en_US
dc.subject Ultrafast lasers en_US
dc.subject Nonlinear optics, materials en_US
dc.title Efficient nonlinear generation of high power, higher order, ultrafast "perfect" vortices in green en_US
dc.type Article en_US
dc.relation.journal Journal of Thermal Analysis and Calorimetry

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