Polarization control technique for x-ray laser

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The purpose of this study is to verify that a Mo/Si multilayer mirror acts as a reflection phase shifter having a retardation of 90 degrees, i.e., quarter-wave plate, for laser-driven soft x-ray laser (XRL). The Mo/Si multilayer phase shifter allows us to control the state of polarization of XRL. A reflection-type Mo/Si multilayer phase shifter is designed and fabricated, and of which the polarization property is characterized by using synchrotron radiation light. The experimental results clearly show that a circularly polarized XRL light is created by means of the phase shifter.