Stable and accurate characterization of optical microcavity using linear frequency modulation and thermal locking.

Precise characterization of the quality factor () and coupling regimes in ultra-low-loss optical microcavities represents a critical research objective. Compact optical microcavities exhibit a smaller surface area, making thermal effects non-negligible. Consequently, the heat induced by the probe light can compromise the accuracy of characterization.

Generation of vector vortex beams with a small core multimode liquid core optical fiber.

We report on the generation of vector vortex beams using a 10-μm core multimode liquid core optical fiber (LCOF) filled with CS(2). The first higher-order modes including radially, azimuthally and hybrid polarized vector modes, as well as the higher-order modes such as LP(21) mode and LP(31) mode are selectively excited by adjusting the incidence angle of the linearly polarized input Gaussian beam with respect to the fiber axis. The interferograms with single forklet verify the phase singularity of the vector beams generated.