Abstract/Details

Hydrocarbon-free resonance transition 795 nm rubidium laser


2009 2009

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Abstract (summary)

Resonance transition rubidium laser operating on the 52P 1/2→52S1/2 transition with a hydrocarbon-free buffer gas is described. An extensive conceptual and numerical modeling study of the hydrocarbon-free rubidium laser is conducted. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. Evidence suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. This degrades long term laser reliability. Our experimental results with a "clean" helium-only buffer gas system pumped by a Ti:sapphire laser demonstrate all the advantages of the alkali laser, but without the reliability issues associated with the use of ethane. We further report a demonstration of a rubidium laser using a buffer gas consisting of pure 3He. Using isotopically enriched 3He gas yields enhanced mixing of the Rb fine-structure levels. This enables efficient lasing at reduced He buffer gas pressure, improved thermal management in high average power Rb lasers and enhanced power scaling potential of such systems. A diode-pumped alkali laser with output power of 150 W is demonstrated using commercial diode pump arrays with linewidths of ~0.5 nm, a regime requiring only modest linewidth control. We anticipate that this approach presents a new pathway to high average power lasers with good beam quality and high efficiency. Furthermore, collisional energy transfer leading to the ionization of active atoms is observed in an optically pumped Rb laser. Using a chopped Ti:sapphire laser as a pump source, their effects on the Rb laser are studied. A simple model is presented with numerical parameters gathered from published literature to explain our observations. Although these parasitic processes can strongly affect laser output, they do not appear to significantly impact the overall laser efficiency in the regime examined in this study.

Indexing (details)


Subject
Electrical engineering;
Optics
Classification
0544: Electrical engineering
0752: Optics
Identifier / keyword
Applied sciences; Pure sciences; Diode-pumped alkali lasers; Hydrocarbon-free lasers; Rubidium lasers
Title
Hydrocarbon-free resonance transition 795 nm rubidium laser
Author
Wu, Sheldon Shao Quan
Number of pages
126
Publication year
2009
Degree date
2009
School code
0033
Source
DAI-B 70/05, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109165036
Advisor
Yu, Paul K.L.
Committee member
Beach, Raymond J.; Ford, Joseph E.; Lo, Yu-Hwa; O'Neil, Thomas M.; Surko, Clifford M.
University/institution
University of California, San Diego
Department
Electrical Engineering (Photonics)
University location
United States -- California
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3356349
ProQuest document ID
304855220
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304855220
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