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Investigation of Optical Pumping and Spin Life-time in Cesium Vapor Cells

Wu, Jinglan (2021) Investigation of Optical Pumping and Spin Life-time in Cesium Vapor Cells. Bachelor's, TU Berlin.

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This thesis investigates the impact of temperature and amount of light on dark state life-times after optical pumping. For this the hyperfine structure of the Cs D1 line was investigated. To do this, a Cesium vapour cell containing 5 torr nitrogen as buffer gas was spectroscoped. For comparison, a cell without buffer gas was also measured. The temperature was controlled between (23 ± 5)°C and 87 ± 5°C with a heating element and the beam diameter between (0; 40 ± 0; 08)mm and (2; 20 ± 0; 08)mm with an aperture. The maximum life-times for the buffer gas cell were found between ((2; 15 ± 0; 06) ms for 23 ± 5)°C and (20 ± 0; 6)µs at (87; 2 ± 5)°C. For comparison, the measurements of a cell without buffer gas yielded a life-time of (15:6 ± 0; 5)µs. The calculated diffusion constants do not contain the theoretical values in the error limits, which indicates that diffusion is not the dominating limiting factor for the life-times. Furthermore, the optical depths of the transitions are calculated. The maximum life-time derived from negative optical depth was found to be (15:6 ± 0; 5)ms at the F=4 ! F’=3 at 23 ± 5)°C. Additionally, the optical depths were compared with optical depths without pumping. They only showed similarities at larger beam diameters.

Item URL in elib:https://elib.dlr.de/144351/
Document Type:Thesis (Bachelor's)
Title:Investigation of Optical Pumping and Spin Life-time in Cesium Vapor Cells
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:Yes
Open Access:No
Keywords:Atomare Dampfzelle
Institution:TU Berlin
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Detectors for optical instruments
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Wolters, Janik
Deposited On:05 Oct 2021 08:58
Last Modified:05 Oct 2021 08:58

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