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Towards a Bose-Einstein Condensate of SrF Molecules
Towards a Bose-Einstein Condensate of SrF Molecules
Towards a Bose-Einstein Condensate of SrF Molecules

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151022
ISBN  
9798383420058
DDC  
539
저자명  
Jorapur, Varun.
서명/저자  
Towards a Bose-Einstein Condensate of SrF Molecules
발행사항  
[Sl] : Yale University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
222 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
주기사항  
Advisor: Lamoreaux, Steve;DeMille, David P.
학위논문주기  
Thesis (Ph.D.)--Yale University, 2024.
초록/해제  
요약In recent years, there has been growing interest in methods for producing gases of ultracold polar molecules, driven by proposals to employ ultracold molecules in applications in ultracold chemistry, quantum information and quantum simulation, and precision measurements. There has been tremendous progress in producing ultracold polar molecules using pre-cooled and assembled alkali atoms, however, this faces limits in the molecule variety and interaction regimes that are accessible. Nonetheless, these techniques have successfully produced the first degenerate gases of polar molecules. Simultaneously, there has been a strong experimental and theoretical focus towards developing techniques to directly laser cool molecules which would enable accessing a diverse species of molecules in different interaction regimes.Here, we review recent advances in the laser cooling and trapping of Strontium Monofluoride (SrF). Building upon previous work, we utilize velocity-selective coherent population trapping to substantially lower the temperature and truly reach the ultracold regime. We then describe how we can use this technique to load a conservative optical dipole trap, the first step towards observing collisions between the molecules. We also describe how we can use the interplay of the differential energy shifts caused by trap light polarizations and the cooling light itself to greatly enhance the loading and reduce the temperature in the trap, heralding large trap densities even with a low molecules number. We detail a new molecule source based on ultracold chemistry that is able to produce a larger molecule flux and a greatly increased experiment lifetime. Next, we detail a new and novel trapping technique that incorporates blue-detuned light, which can achieve large compression of the molecule cloud while cooling it at the same time. Using this new technique, we are able to achieve two orders of magnitude larger density, a big boost for loading the optical dipole trap. We demonstrate that, owing to the small size of this cloud, we are able to load an order of magnitude more molecules than before. With this high density, we demonstrate a measurement of the two-body inelastic collision rate in the trap, the first such demonstration in a bulk gas of directly cooled molecules. We describe ongoing work to achieve quantum control of the molecules in the trap, and the current experimental push to prepare the molecules in the rovibrational ground state. We briefly describe the design of a next generation apparatus which will enable the future experiments towards a BEC. We then describe our efforts towards implementing microwave shielding to lower the inelastic loss rate while also enhancing the elastic collision rate. This is a prerequisite to implementing evaporative cooling, and we describe some estimates of how well this will work in our system. We outline a path to efficient evaporative cooling and find that a BEC is within reach.
일반주제명  
Atomic physics
일반주제명  
Molecular physics
일반주제명  
Optics
일반주제명  
Low temperature physics
키워드  
Laser cooling
키워드  
Molecular cooling and trapping
키워드  
Quantum computing
키워드  
Quantum degeneracy
키워드  
Trapping
키워드  
Ultracold physics
기타저자  
Yale University Physics
기본자료저록  
Dissertations Abstracts International. 86-02B.
전자적 위치 및 접속  
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MARC

 008250123s2024        us                              c    eng  d
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■020    ▼a9798383420058
■035    ▼a(MiAaPQ)AAI30996631
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a539
■1001  ▼aJorapur,  Varun.
■24510▼aTowards  a  Bose-Einstein  Condensate  of  SrF  Molecules
■260    ▼a[Sl]▼bYale  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a222  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-02,  Section:  B.
■500    ▼aAdvisor:  Lamoreaux,  Steve;DeMille,  David  P.
■5021  ▼aThesis  (Ph.D.)--Yale  University,  2024.
■520    ▼aIn  recent  years,  there  has  been  growing  interest  in  methods  for  producing  gases  of  ultracold  polar  molecules,  driven  by  proposals  to  employ  ultracold  molecules  in  applications  in  ultracold  chemistry,  quantum  information  and  quantum  simulation,  and  precision  measurements.  There  has  been  tremendous  progress  in  producing  ultracold  polar  molecules  using  pre-cooled  and  assembled  alkali  atoms,  however,  this  faces  limits  in  the  molecule  variety  and  interaction  regimes  that  are  accessible.  Nonetheless,  these  techniques  have  successfully  produced  the  first  degenerate  gases  of  polar  molecules.  Simultaneously,  there  has  been  a  strong  experimental  and  theoretical  focus  towards  developing  techniques  to  directly  laser  cool  molecules  which  would  enable  accessing  a  diverse  species  of  molecules  in  different  interaction  regimes.Here,  we  review  recent  advances  in  the  laser  cooling  and  trapping  of  Strontium  Monofluoride  (SrF).  Building  upon  previous  work,  we  utilize  velocity-selective  coherent  population  trapping  to  substantially  lower  the  temperature  and  truly  reach  the  ultracold  regime.  We  then  describe  how  we  can  use  this  technique  to  load  a  conservative  optical  dipole  trap,  the  first  step  towards  observing  collisions  between  the  molecules.  We  also  describe  how  we  can  use  the  interplay  of  the  differential  energy  shifts  caused  by  trap  light  polarizations  and  the  cooling  light  itself  to  greatly  enhance  the  loading  and  reduce  the  temperature  in  the  trap,  heralding  large  trap  densities  even  with  a  low  molecules  number.  We  detail  a  new  molecule  source  based  on  ultracold  chemistry  that  is  able  to  produce  a  larger  molecule  flux  and  a  greatly  increased  experiment  lifetime.  Next,  we  detail  a  new  and  novel  trapping  technique  that  incorporates  blue-detuned  light,  which  can  achieve  large  compression  of  the  molecule  cloud  while  cooling  it  at  the  same  time.  Using  this  new  technique,  we  are  able  to  achieve  two  orders  of  magnitude  larger  density,  a  big  boost  for  loading  the  optical  dipole  trap.  We  demonstrate  that,  owing  to  the  small  size  of  this  cloud,  we  are  able  to  load  an  order  of  magnitude  more  molecules  than  before.  With  this  high  density,  we  demonstrate  a  measurement  of  the  two-body  inelastic  collision  rate  in  the  trap,  the  first  such  demonstration  in  a  bulk  gas  of  directly  cooled  molecules.  We  describe  ongoing  work  to  achieve  quantum  control  of  the  molecules  in  the  trap,  and  the  current  experimental  push  to  prepare  the  molecules  in  the  rovibrational  ground  state.  We  briefly  describe  the  design  of  a  next  generation  apparatus  which  will  enable  the  future  experiments  towards  a  BEC.  We  then  describe  our  efforts  towards  implementing  microwave  shielding  to  lower  the  inelastic  loss  rate  while  also  enhancing  the  elastic  collision  rate.  This  is  a  prerequisite  to  implementing  evaporative  cooling,  and  we  describe  some  estimates  of  how  well  this  will  work  in  our  system.  We  outline  a  path  to  efficient  evaporative  cooling  and  find  that  a  BEC  is  within  reach.
■590    ▼aSchool  code:  0265.
■650  4▼aAtomic  physics
■650  4▼aMolecular  physics
■650  4▼aOptics
■650  4▼aLow  temperature  physics
■653    ▼aLaser  cooling
■653    ▼aMolecular  cooling  and  trapping
■653    ▼aQuantum  computing
■653    ▼aQuantum  degeneracy
■653    ▼aTrapping
■653    ▼aUltracold  physics
■690    ▼a0748
■690    ▼a0609
■690    ▼a0752
■690    ▼a0598
■71020▼aYale  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-02B.
■790    ▼a0265
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160455▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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