Two-quantum Anti-Stokes Processes in the Excitation of Dyes

Christoph Zander, Karl Heinz Drexhage

M. S. Chang, S. Elliott, T. Kenneth Gustafson +2 more

Masanori Jyumonji, T. Kobayasi, Humio Inaba

A report is given of the first quantitative study of the spontaneous and stimulated electronic Raman scattering by a resonance doublet of the sodium atom excited resonantly at the D 1 and D 2 lines by a tunable dye laser. Theoretical and experimental analyses of the differential scattering cross section and polarization properties at the Stokes and anti-Stokes frequencies show that the observed scattering is due to a nearly resonant process involving the ground state 3 S 1/2 as the dominant intermediate state. The stimulated Stokes and anti-Stokes scattering lines, which are shifted from the D 1 and D 2 lines by an amount corresponding to the frequency separation between lowest-lying excited doublets 3 P 1/2 and 3 P 3/2 , are observed by exciting a sodium vapor cell with a passively mode-locked dye laser.

Robert Svensson, Leif Holmlid

We report the first Raman study of the Rydberg matter form of Cs, using a ns pulsed dye laser. Electronic Raman anti-Stokes and mixed Stokes processes are detected in the range 290--920 nm after nonresonant excitation at 564 nm. No fluorescence is observed. The anti-Stokes transitions are from a high circular Rydberg state to a low circular state $8J$ in ${\mathrm{Cs}}^{+}$, close to $4F$ in Cs. The Stokes transitions are mixed in one more step with the laser radiation, and go from low circular states to Rydberg matter states. The transitions observed agree well with transitions in ${\mathrm{Cs}}^{+}$.

S. V. Petrushkin, В. В. Самарцев

An anti-Stokes model is proposed which explains the room-temperature blue shift of the echo-signal spectrum compared to the spectrum of exciting femtosecond pulses in a polymer film doped with dye molecules. The possibility of realising the anti-Stokes regime of coherent laser cooling of such films is analysed.

P. F. González‐Díaz