A ray trace modeling for inhomogeneous and heavily saturated laser amplifier

摘要

Although gain saturation had been achieved using a fast discharge scheme [1], a detailed description of the amplification process up to saturation level is far from completion. For the evaluation of effective gain volume and laser energy extraction, refraction effects must be included because the fast discharge makes a complex internal structure in the high energy density plasma [2]. In connection with Z-pinch X-ray laser, a ray-tracing and independently saturating cell model was developed. With this model.the complex problem of refraction and gain depletion process was treated self-consistently. Typical values of plasma parameter at each cell were calculated by 1-D MHD simulation code. For heavier Ne-like schemes, the output beam patterns and the extraction efficiency are discussed based on this scheme.