Arbitrary optical potentials
Here we demonstrate a self-correcting closed loop feedback system for the generation of phase holograms (kinoforms). We investigate the effectiveness of such a system for the production of smooth optical potentials for cold atom experiments. Our algorithm is derived from the Mixed Region Amplitud...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2014
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| Online Access: | http://hdl.handle.net/10356/60810 |
| _version_ | 1811684356829216768 |
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| author | Gan, Koon Siang |
| author2 | Rainer Helmut Dumke |
| author_facet | Rainer Helmut Dumke Gan, Koon Siang |
| author_sort | Gan, Koon Siang |
| collection | NTU |
| description | Here we demonstrate a self-correcting closed loop feedback system for the generation of phase holograms (kinoforms). We investigate the effectiveness of such a system for the production of smooth optical potentials for cold atom experiments.
Our algorithm is derived from the Mixed Region Amplitude Freedom (MRAF) algorithm which solves the problem of obtaining a desired target intensity distribution from an initial Gaussian beam. However, the MRAF assumes an ideal optical system. Experimental imperfections are accounted for by imaging the target intensity distribution in a test-setup via a CCD camera and by using this information in a corrective feedback loop. A ring structure was chosen as a test intensity distribution. Three modifications to the original MRAF algorithm are evaluated. Additionally, performance indicators were defined to assess the quality of the produced optical potential.
Initial results show that closed-loop feedback systems have the potential to mitigate experimental imperfections however more research into corrective algorithms needs to be carried out. |
| first_indexed | 2024-10-01T04:27:20Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/60810 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:27:20Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/608102023-02-28T23:13:44Z Arbitrary optical potentials Gan, Koon Siang Rainer Helmut Dumke School of Physical and Mathematical Sciences DRNTU::Science::Physics::Optics and light Here we demonstrate a self-correcting closed loop feedback system for the generation of phase holograms (kinoforms). We investigate the effectiveness of such a system for the production of smooth optical potentials for cold atom experiments. Our algorithm is derived from the Mixed Region Amplitude Freedom (MRAF) algorithm which solves the problem of obtaining a desired target intensity distribution from an initial Gaussian beam. However, the MRAF assumes an ideal optical system. Experimental imperfections are accounted for by imaging the target intensity distribution in a test-setup via a CCD camera and by using this information in a corrective feedback loop. A ring structure was chosen as a test intensity distribution. Three modifications to the original MRAF algorithm are evaluated. Additionally, performance indicators were defined to assess the quality of the produced optical potential. Initial results show that closed-loop feedback systems have the potential to mitigate experimental imperfections however more research into corrective algorithms needs to be carried out. Bachelor of Science in Physics 2014-05-30T07:52:42Z 2014-05-30T07:52:42Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/60810 en 86 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Gan, Koon Siang Arbitrary optical potentials |
| title | Arbitrary optical potentials |
| title_full | Arbitrary optical potentials |
| title_fullStr | Arbitrary optical potentials |
| title_full_unstemmed | Arbitrary optical potentials |
| title_short | Arbitrary optical potentials |
| title_sort | arbitrary optical potentials |
| topic | DRNTU::Science::Physics::Optics and light |
| url | http://hdl.handle.net/10356/60810 |
| work_keys_str_mv | AT gankoonsiang arbitraryopticalpotentials |