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We report development of an astro-comb providing >7000 lines spaced by 16 GHz from 500–620 nm. A characterization with an FTS shows it can provide sub-10 cm/s calibration accuracy of astrophysical spectrographs performing exo-Earth searches.
We propose a new mode-filtering scheme for astro-combs using two Fabry-Perot cavities: a “conjugate Fabry-Perot cavity pair”. Simulations suggest that this scheme improves astro-comb accuracy in the presence of errors from nonlinear fibers.
We demonstrate a broadband visible-wavelength astro-comb enabled by two key technologies: dispersion-managed, fiber-optic Cherenkov radiation for green-to-red source-comb generation and complementary chirped-mirror pairs for constructing broadband Fabry-Perot filtering cavities.
We propose and analyze an approach to generate broadband large-spacing frequency-combs using complementary interleavers for mode-filtering and nonlinear fibers for spectral broadening. 350-nm bandwidth with negligible side-mode asymmetry is achieved.
We develop an analytical approach to analyze the performance of astro-combs when amplified by a fiber amplifier. Five filtering schemes are compared to optimize side-mode suppression and radial-velocity calibration accuracy of an amplified astro-comb.
We developed a tunable, visible frequency comb near 420nm with 22GHz mode spacing and 20nm spectral width, which is able to calibrate astronomical spectrographs to search Earth-like exoplanets orbiting around stars similar to the Sun.
We propose and analyze an approach to generating broadband astro-combs with 1 cm/s (∼10 kHz) calibration accuracy on astrophysical spectrographs. Implementation of these astro-combs requires a side-mode suppression of 60 dB before nonlinear spectral broadening.
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