2019/11/04 by Meenakshi Gaira, B. Krishnan, Gaira, Meenakshi +1
Engineering · #Advanced Fiber Optic Sensors #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics) #Photonic and Optical Devices #Semiconductor Lasers and Optical Devices
paper · pdf · doi:10.48550/arxiv.1911.01187
openalex publication_date 2019/11/04 · openalex created_date 2020/05/01 · openalex updated_date 2026/07/28
A complete integrated table-top facility for the study of high-Q Whispering Gallery Modes in solid and liquid micro-cavities is described, with emphasis on the in situ fabrication of reliable tapered fibers of sub-micron waist sizes for coupling light into time-dependent liquid micro-cavities. The experimental parameters have been chosen to get nearly adiabatic tapers, with their waist size consistent with the theoretical model. The oscillations in the transmitted power during fiber tapering are monitored to check the coupling of higher order modes and identify the point when the fiber is suitable for pure single mode coupling. The fabricated tapered fibers have greater than 85% transmission on the average and very good polarization fidelity. The tapered fibers have been used for efficiently exciting and detecting WGMs of Q∼107 in silica microspheres and of Q up to 7×107 in microdrops of silicone oils.