Abstract

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

Generation of tunable infrared picosecond pulses at 100 MHz by difference-frequency mixing in KTiOPO₄

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