A laser frequency comb provides a vast array of absolutely known and precisely controlled spectral lines that can be used for direct spectroscopy as well as spectral calibration. In this talk, we present recent laser and nonlinear optics advances that extend laser frequency comb spectral coverage from 350 nm to beyond 20,000 nm.  This is accomplished with robust erbium-fiber laser technology in the 1550 nm region that pumps nonlinear photonic platforms such as lithium niobate, gallium phosphide, and silicon nitride.  Of particular interest is a simple and robust method for generating frequency combs spanning the 6-20 micron fingerprint region through intra-pulse difference frequency generation in an orientation-patterned gallium phosphide crystal. This frequency comb is orders of magnitude brighter than thermal light sources and comparable to infrared beam lines at synchrotron user facilities. We demonstrate the utility of our unique, coherent light source for high-resolution (100 MHz), dual-comb spectroscopy of molecular compounds.  Finally, we discuss the generation and application of a near infrared frequency comb having 30 GHz spacing for the calibration of the R=60,000 Habitable-Zone Planet Finder to enable the absolute measurement of stellar radial velocity spectroscopy with resolution at the 10 cm/s level.<br/>

Broad bandwidth laser frequency combs for terrestrial and astronomical spectroscopy

256th National Meeting (2018)

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