Coherence measurement of x-rays from x-ray laser cavity and development of x-ray optical system for application of coherent x-rays

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Investigations of coherence diagnostics for x-ray laser radiation, x-ray laser source and soft x-ray interferometric system have been proceeded. The main results are as follows:1. The diagnostic system based on the dispersing coherence diagnostic method has been constructed. It consists of a Young's double-slit, a transmission grating, and an x-ray CCD camera. This provides wavelength dispersion by diffraction through the transmission grating in a direction perpendicular to the interference direction of the double-slit.2. Optimization studies have been performed to increase x-ray laser output in the double target configuration. A trial experiment using x-ray laser cavity has also been done in the double target configuration.3. Measurements on transverse coherence of x-ray beam from our x-ray laser source with the double target configuration have been performed. Young's interference fringe pattern has been observed for the A1 XI 3d-4fline (15.47 nm), one of the lasing lines in this experiment. On the other hand, fringe patterns are not clear for the non-lasing lines around 15 nm.4. Theoretical calculation code has been developed for the analysis of observed fringe patterns, which treats two-beam interference with partially coherent light. By comparing calculation and observed pattern, we can estimate the visibility of interference pattern and the source size.5. A new type of x-ray interferometer system has been proposed. The x-ray interferometer with two transmission grating used as beam splitters has been constructed. Soft x-ray interferometry will be performed after the optical alignment is completed.