HIGH-INTENSITY TUNABLE InSb SPIN-FLIP RAMAN LASER

Abstract
Stimulated spin‐flip Raman scattering with output peak power as high as ∼ 1 kW has been obtained from n‐type InSb (ne ≃ 2 × 1016 cm−3) pumped with 10.6‐μ radiation from a pulsed high‐pressure CO2 laser. The output is tunable from 11.2 to 12.8 μ with magnetic fields from 25 to 100 kG. The threshold intensity for stimulated scattering has been measured to be as low as 4 × 104 W/cm2, which is more than one order of magnitude lower than those reported earlier. The high intensity (∼ 1 kW) in the Stokes line excites a second stimulated Stokes line tunable from 12.0 to 14.6 μ with output power of several watts. In addition, a stimulated anti‐Stokes line, tunable from 10.0 to 9.0 μ, with output power of ∼ 30 W has been observed.