Misha Stepanov | publications | Phys. Rev. A (2001)

S. A. Babin, S. I. Kablukov, S. V. Khorev, E. V. Podivilov, V. V. Potapov, D. A. Shapiro, M. G. Stepanov, Resonant peak in the output spectral profile of an ionic anti‑Stokes Raman laser, Physical Review A 63 (6) 063804 (2001).

DOI: 10.1103/PhysRevA.63.063804
PDF (110.62 KB)

Continuous‑wave generation of the anti‑Stokes Raman laser is demonstrated in the new Λ scheme Ar II 3d ' ²G_9/2 → 4p' ²F_7/2 → 4s' ²D_5/2 with quasimetastable initial and final levels. Red pump radiation with wavelength λ_p = 611 nm from a dye laser that excites transition 3d ' ²G_9/2 → 4p' ²F_7/2 is converted into the blue radiation at λ = 461 nm (4p' ²F_7/2 → 4s' ²D_5/2) with efficiency of about 30%. The tunability range spans more than 20 GHz around exact resonance, which is five times broader than the Doppler contour. The output frequency ω is found to depend linearly on the frequency ω_p of the pump field: ω ≃ ω_p λ_p / λ. A sharp peak of output power is observed in the spectral profile at the exact resonance instead of the well‑known two‑photon dip. The model is proposed that includes ionic scattering in plasma and interaction of the running pump and standing output waves. The theory offers an interpretation of the observed peak.