Open Raman Cell to Avoid Window Damage

An open Raman cell was designed to avoid the window damage in high power Raman amplifiers. The conversion efficiency and the beam quality of the Stokes pulse were measured as a function of time when Raman gases flowed out from the Raman cell. The effects of Raman gas density and diameter of Raman cell on the specification were also discussed. The results showed that this open Raman cell was useful for high power Raman system.