BEGIN:VCALENDAR VERSION:2.0 PRODID:Icfo X-PUBLISHED-TTL:P1W BEGIN:VEVENT UID:6ab949dcd3233 DTSTART:20240709T130000Z SEQUENCE:0 TRANSP:OPAQUE DTEND:20240709T140000Z LOCATION:Blue Lecture Room SUMMARY:ICFO | DANIEL SAHAGÚN SÁNCHEZ CLASS:PUBLIC DESCRIPTION:I will talk about first generation of quasipropagation-invarian t beams by inducing four-wave mixing in atomic gases. \; This was done by exciting the 5S1/2 &mdash\;>\; 5P3/2 &mdash\;>\; 5D5/2 double tran sition followed by the 5D5/2 &mdash\;>\; 6P3/2 &mdash\;>\; 5S1/2 casca de decay of Rb^87. The later yields a bright collimated-blue light that ca n be detected with simple CMOs cameras. The first pump beam had a Gaussian profile whereas the second one was prepared with Mathieu-Gaussian modes\, also solutions of the Helmholtz equation. In a first set of experiments t he second pump optical field had imprinted odd and even Mathieu structures \, carrying elliptical angular momentum. By analysing the configuration an d Fourier spaces of the collimated blue light it was quantitatively verifi ed that the atoms had replicated the incoming modes\, including their dyna mical variables [1]. In a subsequent series of experiments the second pump beam was prepared with helical Mathieu-Gaussian modes\, that contain arra ys of optical singularities. The up-conversion of their information to the collimated blue light has verified by firstly applying the two techniques introduced in [1]. Following\, the presence of the optical vortices was p robed with a Michelson interferometer [2]. \; \;\n[1] Mendoza-L&oa cute\;pez\, L. A. et al. Generalized angular momentum transfer to up-conve rted photons via four-wave mixing in atomic gases. Phys Rev Res 3\, 033170 (2021) \; \; \; \;\n[2] Mendoza-Ló\;pez\, L. A. et al. Frequency Conversion of Optical Vortex Arrays Through Four-Wave Mixing in Hot Atomic Gases. Front. Phys.\, Sec. Quantum Engineering and Technolo gy 10:895023 (2022) \; DTSTAMP:20260927T165244Z END:VEVENT END:VCALENDAR