Spectral Investigation of Laser Plasma Sources for X-Ray Coherence Tomography

We present spectral investigations of laser-plasma sources, in the extreme ultraviolet (EUV) and soft X-ray (SXR) regions from high-Z gases, dedicated for the X-ray coherence tomography experiments. The laser pulses of 4 ns and 650 mJ are used to produce plasma in a double gas puff target. The spectral investigation is done using 3 different spectrometers, spanning 1 nm to 70 nm of the EUV/SXR spectral region. Grazing incidence spectrometers are used in the ranges of 1-5 nm and 10-70 nm, and transmission grating spectrometer is used in the range of 4-16 nm. Specific wavelength bands were identified which are suitable for SXR and EUV XCT measurements. The compact size of the experimental setup of about approximate to 1.5 x 1.5 m(2) makes it suitable for laboratory environments.