Ytterbium-doped microsphere lasers

Dalley, Michael James. (2010). Ytterbium-doped microsphere lasers MPhil Thesis, School of Mathematics and Physics, The University of Queensland.

       
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s41092781_MSc_abstract.pdf Abstract of thesis Click to show the corresponding preview/stream application/pdf 13.16KB 0
s41092781_MSc_totalthesis.pdf Final thesis submission Click to show the corresponding preview/stream application/pdf 1.89MB 16
Author Dalley, Michael James.
Thesis Title Ytterbium-doped microsphere lasers
School, Centre or Institute School of Mathematics and Physics
Institution The University of Queensland
Publication date 2010-06
Thesis type MPhil Thesis
Supervisor Halina Rubinstzein-Dunlop
Mark Fernee
Total pages 90
Total colour pages 10
Total black and white pages 80
Language eng
Subjects 02 Physical Sciences
Abstract/Summary This thesis covers the construction and characterisation of microlasers based on whispering gallery modes in ytterbium-doped microsphere resonators. The microlasers were made by drawing and fusing Yb-doped silica optical fibre into microspheres of approximately 100 μmin diameter using CO2 laser-induced melting. Access to whispering gallery modes was accomplished using a prism coupled to the evanescent field of the internal cavity modes. Microspheres with Q-factors of up to 10^7 were made using this technique. CW multimode lasing was observed at 1050 nm, with a pump threshold required for lasing estimated to be of the order of 100 μW for a 900 nm pump. Both TE and TM modes were identified in the laser emission and the ability to selectively excite each mode family (TE or TM) is shown to be directly controlled by the pump. Pulsed lasing was also observed at 975 nm and 1050 nm.
Keyword Microspheres
whispering gallery mode
silica
ytterbium
microlaser
Lasers in physics
Additional Notes Colour pages: 36, 39, 41, 43, 46, 51, 57, 59, 61, 66.

 
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