elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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.

Full text not available from this repository.

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wu, JinglanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:2021
Refereed publication:Yes
Open Access:No
Status:Unpublished
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.