Article

Polarization properties of an evanescent-wave pumped whispering gallery mode fibre laser

Chinese Science Bulletin (impact factor: 1.32). 04/2012; 55(7):567-572. DOI:10.1007/s11434-009-0698-x pp.567-572

ABSTRACT The polarization properties of an evanescent-wave pumped Whispering Gallery Mode (WGM) fibre laser have been investigated.
It is found that there are two kinds of polarization lasing beam emitting from the evanescent-wave pumped WGM fibre laser
under two different pump conditions. When the pump beam is strictly along the axial direction of an optical fibre, the lasing
emission is transverse electric wave and the electrical vectors at emitting points are along the radial direction of the fibre,
which forms a special radial polarization radiation. However, when the pump beam deviates from the axial direction of the
fibre, both transverse electric and transverse magnetic waves exist in the lasing emission, which forms a mixed polarization
radiation with radial and axial polarized elements. Based on lasing radiation mechanism of evanescent-wave pumped WGM fibre
laser, the observed polarization properties are well explained.

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Keywords

axial direction
 
axial polarized elements
 
different pump conditions
 
electrical vectors
 
lasing emission
 
lasing radiation mechanism
 
observed polarization properties
 
polarization lasing beam emitting
 
polarization properties
 
pump beam
 
pump beam deviates
 
radial
 
radial direction
 
special radial polarization radiation
 
transverse magnetic waves
 
WGM
 
WGM fibre laser
 
Whispering Gallery Mode
 

DeYu Han