Fig. 5: Microresonator-based ultraviolet astrocombs. | Nature Communications

Fig. 5: Microresonator-based ultraviolet astrocombs.

From: Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides

Fig. 5

a Modified setup for microresonator-based ultraviolet (UV) astrocomb generation. b Microresonator comb output spectrum (gray); bandpass-filtered and pre-amplified microresonator-based comb spectrum. c Microresonator-based UV fourth-harmonic and visible (VIS) third-harmonic comb spectra, following the scheme in Fig. 3. The photo shows the photonic chip with the microresonator (dashed-line box) and the inset shows a scanning electron microscope image of the Si3N4 resonator waveguide.

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