A narrow-bandwidth, short-pulse, equal-intensity dual-beam monochromatic soft X-ray source based on laser-produced gold plasma was developed. It utilizes soft X-ray radiation of plasma generated by nanosecond laser irradiation of a gold planar target, with two mirror-symmetric one-dimensional reflective zone plates (1D RZPs) serving as monochromating elements. Measurements of parameters demonstrate that these twin beamlines exhibit an energy bandwidth of about 34 eV @ 395.4 eV and a pulse width of about 13.2 ns, with an intensity ratio of 0.98 : 1. Three different 1D RZPs were fabricated on a single silicon substrate, enabling switching between different energies (395.4 eV, 1.96 eV and 524.9 eV) via translation. This source holds significant potential for rapid testing and online calibration of soft X-ray components such as filters, mirrors, detectors and so on.

Monochromatic dual-beam soft X-ray,Reflective zone plates,Gold plasma