Title

DIRECT OBSERVATION OF ORBITAL ANGULAR MOMENTUM CONSERVATION IN COLLINEAR TYPE-I SPDC

Author

Carlos Andres Sevilla Gutierrez

Contributor

ROBERTO RAMIREZ ALARCON (Thesis Adviser)

Access level

Open Access

Summary or description

"We implement a direct measurement of the spatial modes distribution generated in a collinear type I spontaneous parametric down-conversion (SPDC) process using a triggered intensified CCD camera. This type of experiments have been realized previously. However in those cases the measurement was an indirect one, where both photons were collected into one-pixel detectors. In this thesis, to the best or our knowledge, it is the first time that a direct two dimensional measurement of the spatial modes distribution is made. These are well described by Laguerre-Gaussian modes. In our experiments we could observe up to mode l=+/-10. By exploiting the capabilities of an ICCD camera, it is possible to visualize the orbital angular momentum (OAM) conservation of the unprocessed SPDC bi-photon state. This is performed by observing the diffraction pattern by a triangular aperture. We show the results using this method for modes l=+/-1,+/-2. This conservation of OAM leads to entanglement in OAM, since one photon carries the anti-correlated topological charge with respect to the other one. Therefore, they are conditioned to the state of the other photon."

Publish date

November, 2018

Publication type

Master thesis

Publication version

Published Version

Format

application/pdf

Language

English

Coverage

León, Guanajuato

Audience

General public

Citation suggestion

Sevilla Gutiérrez, (2018). "Direct observation of orbital angular momentum conservation in collinear Type-I SPDC". Maestría en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 55 pp.

Source repository

REPOSITORIO INSTITUCIONAL DEL CIO

Downloads

267

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