EXPERIMENTAL STUDY OF GAIN-SATURATED SOFT X-RAY LASER BY MULTI-TARGET SERIES COUPLING WITH REFLECTIVE MIRROR

The double-pass amplification of Ne -like Ge soft X-ray laser was demonstrated by means of Mo/Si multi - layer reflective mirror. The output intensity of soft X-ray laser with reflective mirror was 40 times larger than that without reflective mirror and tended to be saturated when the total length of two following coupling targets was 28mm. The divergence angle of X-ray laser beam was decreased, the thickness of the gain region became smaller and the spatial coherence of X-ray laser beam was improved. The output intensities of X-ray laser with and without reflective mirror had no obvious difference when the total length of four series coupling targets was 56mm, which showed that the deep saturation of gain was reached.