Perfect vector beams are a class of special vector beams with invariant radius and intensity profiles under changing topological charges.However,with the limitation of current devices,the generation of these vector be...Perfect vector beams are a class of special vector beams with invariant radius and intensity profiles under changing topological charges.However,with the limitation of current devices,the generation of these vector beams is limited in the visible and infrared wavebands.Herein,we generate perfect vector beams in the ultraviolet region assisted by nonlinear frequency conversion.Experimental and simulation results show that the radius of the generated ultraviolet perfect vector beams remains invariant and is thus independent of the topological charge.Furthermore,we measure the power of the generated ultraviolet perfect vector beams with the change of their topological charges.This study provides an alternative approach to generating perfect vector beams for ultraviolet wavebands and may promote their application to optical trapping and optical communication.展开更多
Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical communication.Nonlinear frequency conversion is an effectiv...Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical communication.Nonlinear frequency conversion is an effective technique to expand the frequency range of the vectorial beams.However,the scheme of existing methods to generate vector beams of the second harmonic(SH)lacks compactness in the experiment.Here,we introduce a new way to realize the generation of vector beams of SH by using a nonlinear fork grating to solve such a problem.We examine the properties of generated SH vector beams by using Stokes parameters,which agree well with theoretical predictions.Then we demonstrate that linearly polarized vector beams with arbitrary topological charge can be achieved by adjusting the optical axis direction of the half-wave plate(HWP).Finally,we measure the nonlinear conversion efficiency of such a method.The proposed method provides a new way to generate vector beams of SH by using a microstructure of nonlinear crystal,which may also be applied in other nonlinear processes and promote all-optical waveband applications of such vector beams.展开更多
基金supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0303700 and 2018YFA0306301)the National Natural Science Foundation of China(Grant Nos.11734011,12004245,and 62105154)+3 种基金the Foundation for Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01-ZX06)the Shandong Quancheng Scholarship(Grant No.00242019024)the China Postdoctoral Science Foundation(Grant No.2021M691601)the Natural Science Foundation of Jiangsu Province(Grant No.BK20210324)。
文摘Perfect vector beams are a class of special vector beams with invariant radius and intensity profiles under changing topological charges.However,with the limitation of current devices,the generation of these vector beams is limited in the visible and infrared wavebands.Herein,we generate perfect vector beams in the ultraviolet region assisted by nonlinear frequency conversion.Experimental and simulation results show that the radius of the generated ultraviolet perfect vector beams remains invariant and is thus independent of the topological charge.Furthermore,we measure the power of the generated ultraviolet perfect vector beams with the change of their topological charges.This study provides an alternative approach to generating perfect vector beams for ultraviolet wavebands and may promote their application to optical trapping and optical communication.
基金National Natural Science Foundation of China(12004245,12192252,12374314)National Key Research and Development Program of China(2023YFA1407200)。
文摘Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical communication.Nonlinear frequency conversion is an effective technique to expand the frequency range of the vectorial beams.However,the scheme of existing methods to generate vector beams of the second harmonic(SH)lacks compactness in the experiment.Here,we introduce a new way to realize the generation of vector beams of SH by using a nonlinear fork grating to solve such a problem.We examine the properties of generated SH vector beams by using Stokes parameters,which agree well with theoretical predictions.Then we demonstrate that linearly polarized vector beams with arbitrary topological charge can be achieved by adjusting the optical axis direction of the half-wave plate(HWP).Finally,we measure the nonlinear conversion efficiency of such a method.The proposed method provides a new way to generate vector beams of SH by using a microstructure of nonlinear crystal,which may also be applied in other nonlinear processes and promote all-optical waveband applications of such vector beams.
