[Show abstract][Hide abstract] ABSTRACT: We demonstrate the polarization mode selection and the dependence of coupling efficiency on polarization state of pump light for an optofluidic ring resonator (OFRR) laser. An optical fiber is chosen to serve as the ring resonator and surrounded by rhodamine 6G dye solution of lower refractive index as the fluidic gain medium. When the ring resonator is pumped by a linearly s-polarized laser, the emitted whispering gallery mode (WGM) lasing is of parallel polarization (TM mode), while p-polarized laser excitation generates a vertically polarized lasing emission (TE mode), both TM and TE mode lasing emission coexist simultaneously if the ring resonator is pumped by the s- and p-mixed polarized light. Further investigation reveals that the lasing intensity of the TM mode is approximately twice that of the TE mode for the same pump energy density, meaning an obvious difference of coupling efficiency on the polarization state of pump light; the experimental results of coupling efficiency are well explained by an induced dipole model.
[Show abstract][Hide abstract] ABSTRACT: The quantum interpretation of whispering gallery modes in a cylindrical optical microcavity is presented in analogy with quantum mechanical theory. The formulas for the resonance shifts caused by a small change in correlative refractive index are derived. Then they are applied to two applications of the cylindrical microcavity to probe the change of surrounding medium and the nonlinear effect of cavity's surface.
No preview · Article · May 2011 · Optik - International Journal for Light and Electron Optics
[Show abstract][Hide abstract] 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.
No preview · Article · Mar 2010 · Chinese Science Bulletin