Precision astronomical spectroscopy is vital for seeking life beyond Earth and often relies on detecting very small wavelength shifts over years. Precision of these instruments are ensured by regular wavelength calibration and laser frequency combs stabilized with frequency standards have recently emerged as suitable sources. In this work, we demonstrate wavelength calibration of an astronomical spectrograph in ultraviolet spectrum below 400 nm. This is achieved using second- and third- order nonlinear effects in thin-film, periodically poled lithium niobate waveguides with an infrared electro-optic comb generator at 18 GHz.
In many applications of whispering gallery (WG) resonators and optical nanofibers as well as their coupling systems, the freedom of polarization is not critical. Inspired by the results from near-field optics, we found the freedom of polarization may bring up interesting ideas into these systems. In this talk, I will introduce three experiments about the polarization-controlled light coupling in WG resonator-nanofiber coupling system. The first one is the realization of the full polarization control of a nanofiber; The second one is the cavity enhanced directional coupling; The third one is the polarization-controlled cavity input-output relations.
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