Formation of two-dimensional monochromatic images of a laser jet by a spherically bent mica crystal

Ultrashort-pulse, laser-produced plasmas have become very interesting laboratory sources to study spectroscopically due to their very high densities and temperatures, and the high laser-induced electromagnetic fields present. Typically, these plasmas are of very small volume and very low emissivity. Thus, studying these near point source plasmas requires advanced experimental techniques. We present a new spectrometer design called the focusing spectrometer with spatial resolution (FSSR-2D) based on a spherically bent crystal which provides simultaneous high spectral (λ/Δλ≈104) and spatial resolution (≈10 μm) as well as high luminosity (high collection efficiency). We described in detail the FSSR-2D case in which a small, near point source plasma is investigated. An estimate for the spectral and spatial resolution for the spectrometer is outlined based on geometric considerations. Using the FSSR-2D instrument, experimental data measured from both a 100 fs and a nanosecond pulse laser-produced plasma are presented.

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High-resolution x-ray spectrometer based on spherically bent crystals for investigations of femtosecond laser plasmas

Young

Osterheld

Price

et al. 1998

Review of Scientific Instruments

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Wide band focusing x-ray spectrograph with spatial resolution

Pikuz

Douglass

Shelkovenko

et al. 2008

Review of Scientific Instruments

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A new, wide spectral bandwidth x-ray spectrograph, the wide-bandwidth focusing spectrograph with spatial resolution (WB-FSSR), based on spherically bent mica crystals, is described. The wide bandwidth is achieved by combining three crystals to form a large aperture dispersive element. Since the WB-FSSR covers a wide spectral band, it is very convenient for application as a routine diagnostic tool in experiments in which the desired spectral coverage is different from one test to the next. The WB-FSSR has been tested in imploding wire-array experiments on a 1 MA pulsed power machine, and x-ray spectra were recorded in the 1-20 A spectral band using different orders of mica crystal reflection. Using a two mirror-symmetrically placed WB-FSSR configuration, it was also possible to distinguish between a real spectral shift and a shift of recorded spectral lines caused by the spatial distribution of the radiating plasma. A spectral resolution of about 2000 was demonstrated and a spatial resolution of approximately 100 microm was achieved in the spectral band of 5-10 A in second order of mica reflection. A simple method of numerical analysis of spectrograph capability is proposed.

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Investigation of an x-ray source based on a gas puff heated by laser radiation

et al. 1995

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Formation of two-dimensional monochromatic images of a laser jet by a spherically bent mica crystal

Cited by 4 publications

References 5 publications

High-resolution x-ray spectrometer based on spherically bent crystals for investigations of femtosecond laser plasmas

High-resolution x-ray spectrometer based on spherically bent crystals for investigations of femtosecond laser plasmas

Wide band focusing x-ray spectrograph with spatial resolution

Investigation of an x-ray source based on a gas puff heated by laser radiation

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