Effect of stimulated rotational Raman scattering on phase of high-power ultraviolet laser beam

Using the model of transient stimulated rotational Raman scattering (SRRS) and phase perturbation, SRRS effects on high power ultraviolet laser beams with phase noise through long air paths were studied. The effects of both low and high frequency phase perturbation on the threshold of the SRRS effects, the conversion efficiency of Stokes field and the phase of the residual pump field and the Stokes field were discussed in detail. The results show that the influence of the phase noise of the initial pump field on the Stokes field is more obvious than on the residual pump field. The variation of the conversion efficiency with the high frequency phase perturbation is larger than that with the low one. The SRRS threshold decreases with the increasing of the RMS value of low-frequency phase per