A Raman echo on a picosecond timescale on the υ = 0 → 1 vibrational transition in nitrogen gas (8 atm. ≈ 300 K) was observed. We have used two synchronously pumped dye lasers which were amplified in dye amplifiers. Using the ps pulses from these two dye lasers and the second harmonic from a Nd:YAG laser in a four wave mixing experiment the Raman susceptibility decay (analogous to the free induction decay) and the echo decay were measured. © 1984.
Brückner, V., Bente, E. A. J. M., Langelaar, J., Bebelaar, D., & Van Voorst, J. D. W. (1984). Raman echo on a picosecond timescale in nitrogen gas. Optics Communications, 51(1), 49–52. https://doi.org/10.1016/0030-4018(84)90282-7