Towards a Visible to Mid-Infrared Astrocomb for the Extremely Large Telescope
2019
The Extremely Large Telescope (ELT), currently under construction in Chile, aims to investigate exoplanet atmospheric spectroscopy, star / planet formation and evolution, and cosmology and fundamental physics with a broadband high-resolution spectrograph, designated ELT-HIRES. Comprising four modules covering wavelengths from 370–2500 nm, this instrument requires laser comb calibration with mode spacings from 32 GHz ( 1950 nm). As illustrated by our recent review paper [1], approaches to date based on nonlinear broadening of a single ultrafast oscillator still fall significantly short of the required coverage. Here we present a new approach yielding a nearly-continuous 500–2200 nm 1-GHz comb from dual supercontinua sources pumped by an 805-nm Ti:sapphire oscillator and phase coherent 1610-nm pulses from a degenerate optical parametric oscillator (OPO) [2].
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