Enhancement of Anti-Stokes Line of Stimulated Four-Photon Mixingin an Er³⁺ Doped Silica Fiber

By using a pulsed dye Laser of nanosecond level as a pomp source, we have investigated stimulated Raman scattering and stimulated four-photon mixing in Er³⁺ doped silica fibers. The experimental results show that all lines, including the pump radiation line, are obviously broadened and the anti-Stokes lines of stimulated four-photon mixing arc greatly enhanced, and that the enhancement effect is independent of the wavelength.