title: Application of a transmission crystal x-ray spectrometer to moderate-intensity laser driven sources.
abstract: In the pursuit of novel, laser-produced x-ray sources for medical imaging applications, appropriate instrumental diagnostics need to be developed concurrently. A type of transmission crystal spectroscopy has previously been demonstrated as a survey tool for sources produced by high-power and high-energy lasers. The present work demonstrates the extension of this method into the study of medium-intensity laser driven hard x-ray sources with a design that preserves resolving power while maintaining high sensitivity. Specifically, spectroscopic measurements of characteristic Kα and Kβ emissions were studied from Mo targets irradiated by a 100 fs, 200 mJ, Ti: sapphire laser with intensity of 10(17) W/cm(2) to 10(18) W∕cm(2) per shot. Using a transmission curved crystal spectrometer and off-Rowland circle imaging, resolving powers (E/ΔE) of around 300 for Mo Kα(2) at 17.37 keV were obtained with an end-to-end spectrometer efficiency of (1.13 ± 0.10) × 10(-5). This sensitivity is sufficient for registering x-ray lines with high signal to background from targets following irradiation by a single laser pulse, demonstrating the utility of this method in the study of the development of medium-intensity laser driven x-ray sources.
authors.affiliation: Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China.
authors.forename: J Y
authors.initials: JY
authors.lastname: Mao
authors.forename: L M
authors.initials: LM
authors.lastname: Chen
authors.forename: L T
authors.initials: LT
authors.lastname: Hudson
authors.forename: J F
authors.initials: JF
authors.lastname: Seely
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Sun
authors.forename: X X
authors.initials: XX
authors.lastname: Lin
authors.forename: J
authors.initials: J
authors.lastname: Zhang