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We report an all-fiber laser that emits a radially polarized cylindrical vector beam (CVB) at 1 μm based on an intracavity acousto-optic mode converter. We efficiently generate the CVB, taking advantage of the acousto-optic coupling from the HE11 mode to the TM01 mode in a two-mode fiber. The laser can be switched from emitting a Gaussian-like beam to a radially polarized CVB. Radially polarized CVBs...
We demonstrate the fabrication process of millimeter-size lithium niobate (LiNbO$_3$) whispering-gallery-mode (WGM) disk-resonators. We fabricate both $x$- and $z$-cut disk-resonators, starting from commercially available LiNbO$_3$ disks with diameters of 12 mm and thicknesses of 1 mm. We characterize these two WGM resonators using a prism coupling configuration. We find that both resonators feature...
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