Substantial pulse deformation of picosecond pulses at λ = 4.3 μm in air is observed, resulting from strong coherent interaction with 10 nearly equidistant rovibrational lines of the asymmetric ν3 stretching mode of CO2. The coherent reemissions of the different states interfere constructively after times of Δt = 19 and 38 psec as expected from the frequency separation of two neighboring states of Δν̃ = 1.75 cm−1 according to the equation Δt = (c × Δν̃)−1.
© 1989 Optical Society of America
Original Manuscript: December 30, 1988
Manuscript Accepted: March 26, 1989
Published: June 15, 1989
M. Woerner, A. Seilmeier, and W. Kaiser, "Reshaping of infrared picosecond pulses after passage through atmospheric CO2," Opt. Lett. 14, 636-638 (1989)