  In a recent study [1], we demonstrated a multi-heterodyne differential
absorption lidar (DIAL) for greenhouse gas monitoring utilizing solid targets.
The multi-frequency absorption measurement was achieved using electro-optic
dual-comb spectroscopy (DCS) with a minimal number of comb teeth to maximize
the optical power per tooth. In this work, we examine the lidar's working
principle and architecture. Additionally, we present measurements of
atmospheric CO2 at 1572 nm over a 1.4 km optical path conducted in summer 2023.
Furthermore, we show that, due to the high power per comb tooth,
multi-frequency Doppler wind speed measurements can be performed using the DCS
signal from aerosol backscattering. This enables simultaneous radial wind speed
and path-average gas concentration measurements, offering promising prospects
for novel concepts of tunable multi-frequency lidar systems capable of
simultaneously monitoring wind speed and gas concentrations.
  [1] W. Pati\~no Rosas and N. C\'ezard, "Greenhouse gas monitoring using an
IPDA lidar based on a dual-comb spectrometer," Opt. Express 32, 13614-13627
(2024).
