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Synthetic Lorentz force for neutral cold atoms


Šantić, Neven
Synthetic Lorentz force for neutral cold atoms, 2018., doktorska disertacija, Prirodoslovno-matematički fakultet, Zagreb


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Naslov
Synthetic Lorentz force for neutral cold atoms

Autori
Šantić, Neven

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, doktorska disertacija

Fakultet
Prirodoslovno-matematički fakultet

Mjesto
Zagreb

Datum
15.02

Godina
2018

Stranica
132

Mentor
Ban, Ticijana

Ključne riječi
synthetic ; magnetism ; frequency ; comb ; cooling

Sažetak
Presented in this thesis are results of research on two topics in the field of cold atoms.These topics are connected by the fact they both employ laser induced forces caused by momentum transfer from photons to atoms. In both cases the laser induced forces change the velocity distribution of the atomic ensemble. In the first part of the thesis a new way to implement a synthetic Lorentz force into a cold atomic gas is presented. The synthetic Lorentz force (SLF) is based on radiation pressure and the Doppler effect, making it straightforward to implement in a large volume, for a broad range of velocities, and can be extended to different geometries. The force is perpendicular to the velocity of an atom, and zero for an atom at rest. This SFL is experimentally demonstrated in a system of cold rubidium atoms in two scenarios: first, by observing the center-of-mass motion of a cold atomic cloud and second, by observing the angular deflection of a rotationally asymmetrical cloud when released from a magneto-optical trap. The introduction of synthetic magnetism into the system of cold thermal atoms makes it an excellent candidate to emulate numerous complex classical systems, for example a tokamak fusion reactor or a star. In the second part of the thesis, the possibility of laser cooling with a frequency comb (FC) is explored. For this purpose a scheme for full stabilization of a fiber based FC that does not require traditional self- referencing is developed and implemented ; the repetition frequency is locked to a stable microwave reference while the offset frequency is indirectly stabilized by referencing the frequency comb to a continuous wave laser that is stabilized by polarization spectroscopy in rubidium vapor. The FC stabilized in this way is used to cool rubidium atoms on a dipole- allowed transition at 780 nm to sub-Doppler temperatures. Temperatures as low as 55 μK were measured in a one-dimensional FC cooling geometry using the time-of-flight method. Laser cooling with FCs could enable achieving sub- Doppler temperatures for atoms with dipole allowed transitions in the vacuum ultraviolet. This can significantly improve the precision of optical frequency standards, enable measurements of fundamental constants with unprecedented accuracy, and open up the possibility to reach quantum degeneracy with atoms that have optical transitions unreachable by continuous wave lasers such as hydrogen, deuterium and antihydrogen.

Izvorni jezik
Engleski



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2014-09-7342 - Optomehanika uzrokovana frekventnim češlje (Ticijana Ban, )

Ustanove
Institut za fiziku, Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Ticijana Ban (mentor)

Avatar Url Neven Šantić (autor)

Citiraj ovu publikaciju

Šantić, Neven
Synthetic Lorentz force for neutral cold atoms, 2018., doktorska disertacija, Prirodoslovno-matematički fakultet, Zagreb
Šantić, N. (2018) 'Synthetic Lorentz force for neutral cold atoms', doktorska disertacija, Prirodoslovno-matematički fakultet, Zagreb.
@phdthesis{phdthesis, author = {\v{S}anti\'{c}, N.}, year = {2018}, pages = {132}, keywords = {synthetic, magnetism, frequency, comb, cooling}, title = {Synthetic Lorentz force for neutral cold atoms}, keyword = {synthetic, magnetism, frequency, comb, cooling}, publisherplace = {Zagreb} }