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Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion

Sevilla, Carlos Andres
http://orcid.org/0000-0002-7107-5697
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719

Abstract Details

2018, Master of Science (M.S.), University of Dayton, Electro-Optics.
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 ICCD camera. This type of experiments have been realized previously. However such 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.
Qiwen Zhan, PhD (Advisor)
Roberto Ramirez, PhD (Advisor)
73 p.
Electromagnetism; Engineering; Optics; Physics; Quantum Physics
OAM; conservation; SPDC; entaglement; Laguerre-Gaussian

Recommended Citations

Citations

  • Sevilla, C. A. (2018). Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719

    APA Style (7th edition)

  • Sevilla, Carlos. Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion. 2018. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719.

    MLA Style (8th edition)

  • Sevilla, Carlos. "Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion." Master's thesis, University of Dayton, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719

    Chicago Manual of Style (17th edition)

dayton1543326773239719
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© 2018, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.