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[ subject:"Engineering, Sanitary and Municipal." ]
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A circularly polarized optical dipol...
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Corwin, Kristan Lee.
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A circularly polarized optical dipole trap and other developments in laser trapping of atoms.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
A circularly polarized optical dipole trap and other developments in laser trapping of atoms./
作者:
Corwin, Kristan Lee.
面頁冊數:
150 p.
附註:
Director: Carl E. Wieman.
Contained By:
Dissertation Abstracts International60-12B.
標題:
Engineering, Sanitary and Municipal. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9955264
ISBN:
0599583576
A circularly polarized optical dipole trap and other developments in laser trapping of atoms.
Corwin, Kristan Lee.
A circularly polarized optical dipole trap and other developments in laser trapping of atoms.
- 150 p.
Director: Carl E. Wieman.
Thesis (Ph.D.)--University of Colorado at Boulder, 1999.
Several innovations in laser trapping and cooling of alkali atoms are described. These topics share a common motivation to develop techniques for efficiently manipulating cold atoms. Such advances facilitate sensitive precision measurements such as parity non-conservation and 8-decay asymmetry in large trapped samples, even when only small quantities of the desired species are available.
ISBN: 0599583576Subjects--Topical Terms:
1018731
Engineering, Sanitary and Municipal.
A circularly polarized optical dipole trap and other developments in laser trapping of atoms.
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Several innovations in laser trapping and cooling of alkali atoms are described. These topics share a common motivation to develop techniques for efficiently manipulating cold atoms. Such advances facilitate sensitive precision measurements such as parity non-conservation and 8-decay asymmetry in large trapped samples, even when only small quantities of the desired species are available.
520
$a
First, a cold, bright beam of Rb atoms is extracted from a magneto-optical trap (MOT) using a very simple technique. This beam has a flux of 5 × 10<super>9</super> atoms/s and a velocity of 14 m/s, and up to 70% of the atoms in the MOT were transferred to the atomic beam. Next, a highly efficient MOT for radioactive atoms is described, in which more than 50% of <super> 221</super>Fr atoms contained in a vapor cell are loaded into a MOT. Measurements were also made of the <super>221</super>Fr 7 <super>2</super>P<sub>1/2</sub> and 7 <super>2</super>P<sub>3/2</sub> energies and hyperfine constants. To perform these experiments, two schemes for stabilizing the frequency of the light from a diode laser were developed and are described in detail.
520
$a
Finally, a new type of trap is described and a powerful cooling technique is demonstrated. The circularly polarized optical dipole trap provides large samples of highly spin-polarized atoms, suitable for many applications. Physical processes that govern the transfer of large numbers of atoms into the trap are described, and spin-polarization is measured to be 98(1)%. In addition, the trap breaks the degeneracy of the atomic spin states much like a magnetic trap does. This allows for RF and microwave cooling via both forced evaporation and a Sisyphus mechanism. Preliminary application of these techniques to the atoms in the circularly polarized dipole trap has successfully decreased the temperature by a factor of 4 while simultaneously increasing phase space density.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9955264
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