title: Demonstration of polarization mode selection and coupling efficiency of optofluidic ring resonator lasers.
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.
authors.forename: Yuanxian
authors.initials: Y
authors.lastname: Zhang
authors.forename: Weidong
authors.initials: W
authors.lastname: Meng
authors.forename: Hongyue
authors.initials: H
authors.lastname: Yang
authors.forename: Yufei
authors.initials: Y
authors.lastname: Chu
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Pu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D008027:Light; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D012212:Rheology / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*