{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:2477"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:2477","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap","abstract":"We employ a double-MOT system where atoms are firstly collected for their precooling in a 2D-geometry in a high pressure region. From this source region thereafter, the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 10^8 atoms/s. After a loading time of 1s and a loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its diagnostic tools will be presented.","abstract_html":"We employ a double-MOT system where atoms are firstly collected for their precooling in a 2D-geometry in a high pressure region. From this source region thereafter, the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 10^8 atoms/s. After a loading time of 1s and a loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its diagnostic tools will be presented.","abstract_has_math":false,"creators":["Tripathi, Ajay"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Helm, Hanspeter"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:22:46Z","subjects":["Dipolfalle","Laser Cooling","Bose -Einstein Condensation","Optical Trap"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/2477","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Helm, Hanspeter"]},{"key":"dc:creator","label":"Author","values":["Tripathi, Ajay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["DoctoralThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Dipolfalle","Laser Cooling","Bose -Einstein Condensation","Optical Trap"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["We employ a double-MOT system where atoms are firstly collected for their precooling in a 2D-geometry in a high pressure region. From this source region thereafter, the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 10^8 atoms/s. After a loading time of 1s and a loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its diagnostic tools will be presented.","Wir benutzen ein doppeltes MOT system, in dem die Atome zuerst zum Vorkuehlen in einer 2D-Geometrie mit hohem Druck gesammelt werden. As dieser Quelle werden die Atome dann effizient in eine konventionelle MOT mit UHV transferiert mit Einfangsraten von ueber 10^8 Atome/s. Nach einer Ladezeit von 1s und einer Ladephase von 60 ms sind 1 Prozent der Atome in dem CO2 Laserfokus eingefangen. Das Verdampfungskuehlen wird optimiert, indem die Fallentiefe fuer eine Zeitdauer von 7s erniedrigt wird, was zu Kondensaten mit typischerweise 20 000 Atomen fuehrt. In dieser Arbeit wird eine detalierte Charakterisierung des Systems und seiner Diagnose-Tools vorgestellt."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap","Experimentelle Untersuchung von Verdampfungskühlung und Bose-Einstein Kondensation in einer optischen Falle"]}]}],"canonical_facts":{"dc:contributor":["Helm, Hanspeter"],"dc:creator":["Tripathi, Ajay"],"dc:description.abstract":["We employ a double-MOT system where atoms are firstly collected for their precooling in a 2D-geometry in a high pressure region. From this source region thereafter, the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 10^8 atoms/s. After a loading time of 1s and a loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its diagnostic tools will be presented.","Wir benutzen ein doppeltes MOT system, in dem die Atome zuerst zum Vorkuehlen in einer 2D-Geometrie mit hohem Druck gesammelt werden. As dieser Quelle werden die Atome dann effizient in eine konventionelle MOT mit UHV transferiert mit Einfangsraten von ueber 10^8 Atome/s. Nach einer Ladezeit von 1s und einer Ladephase von 60 ms sind 1 Prozent der Atome in dem CO2 Laserfokus eingefangen. Das Verdampfungskuehlen wird optimiert, indem die Fallentiefe fuer eine Zeitdauer von 7s erniedrigt wird, was zu Kondensaten mit typischerweise 20 000 Atomen fuehrt. In dieser Arbeit wird eine detalierte Charakterisierung des Systems und seiner Diagnose-Tools vorgestellt."],"dc:format.medium":["application/pdf"],"dc:subject":["Dipolfalle","Laser Cooling","Bose -Einstein Condensation","Optical Trap"],"dc:title":["Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap","Experimentelle Untersuchung von Verdampfungskühlung und Bose-Einstein Kondensation in einer optischen Falle"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:22:46Z"}