Frequency Comb Velocity-Modulation Spectroscopy

Abstract

We have demonstrated a new technique that provides massively parallel comb\nspectroscopy sensitive specifically to ions through the combination of\ncavity-enhanced direct frequency comb spectroscopy with velocity modulation\nspectroscopy. Using this novel system, we have measured electronic transitions\nof HfF+ and achieved a fractional absorption sensitivity of 3 x 10-7 recorded\nover 1500 simultaneous channels spanning 150 cm-1 around 800 nm with an\nabsolute frequency accuracy of 30 MHz (0.001 cm-1). A fully sampled spectrum\nconsisting of interleaved measurements is acquired in 30 minutes.\n